diff --git a/.gitignore b/.gitignore
index 504a21b4251398698e2099cf82d3adf1539b435f..ed5197b86de6eddcb1e4017f86977744b599eb01 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,8 @@ documentation/design/*.pdf
 *.blg
 *.lof
 *.log
-*.out
\ No newline at end of file
+*.out
+.idea/gosdn.iml
+.idea/modules.xml
+.idea/vcs.xml
+.idea/workspace.xml
diff --git a/Programming.md b/Programming.md
new file mode 100644
index 0000000000000000000000000000000000000000..8c11bc5e0b370a11bcecc8de3249eac203fe8e7a
--- /dev/null
+++ b/Programming.md
@@ -0,0 +1,27 @@
+# Collection of programming stuff
+
+## Dependencies
+
+* github.com/spf13/cobra: used for basic cli of gosdn, such as starting the daemon, get versioning info etc
+* grpc
+
+## Structure of the code
+
+main.go: main() function
+nucleus/: core functionality of gosdn 
+
+ygot (yang for go tools).
+Checkout this in go: go get github.com/openconfig/ygot/ygot
+
+## Usefull things to know
+
+Regenerate gRPC code (https://grpc.io/docs/languages/go/quickstart/#regenerate-grpc-code)
+
+* ( cd  ~/go/src/github.com/grpc-go/cmd/protoc-gen-go-grpc/ && go install . )
+*
+protoc \
+  --go_out=Mgrpc/service_config/service_config.proto=/internal/proto/grpc_service_config:. \
+  --go-grpc_out=Mgrpc/service_config/service_config.proto=/internal/proto/grpc_service_config:. \
+  --go_opt=paths=source_relative \
+  --go-grpc_opt=paths=source_relative \
+  cliInterface/gosdnCLI.proto
\ No newline at end of file
diff --git a/cliInterface/gosdnCLI.proto b/cliInterface/gosdnCLI.proto
new file mode 100644
index 0000000000000000000000000000000000000000..e53443f18a8ccb3c02ca38d373dc68d940d35fd4
--- /dev/null
+++ b/cliInterface/gosdnCLI.proto
@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+option go_package = "gitlab.fbi.h-da.de/cocsn/gosdn";
+option java_multiple_files = true;
+option java_package = "de.h-da.fbi.gosdn.cliInterface";
+option java_outer_classname = "cliInterface";
+
+
+package cliInterface;
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}
diff --git a/gosdn-cli/gosdn-cli.go b/gosdn-cli/gosdn-cli.go
new file mode 100644
index 0000000000000000000000000000000000000000..bdec44088f2fcb059c4c443e1d9ed24b00189c52
--- /dev/null
+++ b/gosdn-cli/gosdn-cli.go
@@ -0,0 +1,40 @@
+package main
+
+import (
+	"context"
+	"google.golang.org/grpc"
+	"log"
+	"os"
+	pb "project-beachhead/grpc_interface"
+	"time"
+)
+
+const (
+	address     = "localhost:55055"
+	defaultName = "gosdn-cli"
+)
+
+// Based on the helloworld example of grpc.io
+
+func main() {
+	// Set up a connection to the server.
+	conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock())
+	if err != nil {
+		log.Fatalf("did not connect: %v", err)
+	}
+	defer conn.Close()
+	c := pb.NewGreeterClient(conn)
+
+	// Contact the server and print out its response.
+	name := defaultName
+	if len(os.Args) > 1 {
+		name = os.Args[1]
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+	r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})
+	if err != nil {
+		log.Fatalf("could not greet: %v", err)
+	}
+	log.Printf("Greeting: %s", r.GetMessage())
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000000000000000000000000000000000000..51070692eb055f3774ece212a267fd7d61b0a96f
--- /dev/null
+++ b/main.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+	"project-beachhead/nucleus"
+)
+
+// Generate the code out of the yang modules
+//go:generate go run $GOPATH/src/github.com/openconfig/ygot/generator/generator.go -path=yang -output_file=goSDN/goSDNgo.go -package_name=gosdn -generate_fakeroot -fakeroot_name=device -compress_paths=true -shorten_enum_leaf_names -exclude_modules=ietf-interfaces yang/openconfig-interfaces.yang yang/openconfig-if-ip.yang
+
+func main() {
+	println("This is the network superintendent...")
+
+	// hand off to cmd for further processing
+	cmd.Execute()
+
+	// nothing to see here, please move on!
+}
diff --git a/nucleus/controller.go b/nucleus/controller.go
new file mode 100644
index 0000000000000000000000000000000000000000..c396048c3eca069a21648cadfa43fc60ffbeb880
--- /dev/null
+++ b/nucleus/controller.go
@@ -0,0 +1,38 @@
+package nucleus
+
+import (
+	"fmt"
+	"github.com/openconfig/ygot/ygot"
+	"net"
+	gosdn "project-beachhead/goSDN"
+)
+
+func AssembleJSON() {
+	// Build my device
+	d := &gosdn.Device{}
+
+	interfaces, _ := net.Interfaces()
+	for _, iface := range interfaces {
+		fmt.Println(iface.Name)
+		i, err := d.NewInterface(iface.Name)
+		if err != nil {
+			panic(err)
+		}
+		i.Mtu = ygot.Uint16(234)
+		//i.Mtu = ygot.Uint16(iface.MTU)
+	}
+
+	// EmitJSON from the ygot library directly does .Validate() and outputs JSON in
+	// the specified format.
+	json, err := ygot.EmitJSON(d, &ygot.EmitJSONConfig{
+		Format: ygot.RFC7951,
+		Indent: "  ",
+		RFC7951Config: &ygot.RFC7951JSONConfig{
+			AppendModuleName: true,
+		},
+	})
+	if err != nil {
+		panic(fmt.Sprintf("JSON demo error: %v", err))
+	}
+	fmt.Println(json)
+}
\ No newline at end of file
diff --git a/nucleus/nucleus-core.go b/nucleus/nucleus-core.go
new file mode 100644
index 0000000000000000000000000000000000000000..48d452a45b110e9ad056fcfe554464470ae66dd0
--- /dev/null
+++ b/nucleus/nucleus-core.go
@@ -0,0 +1,81 @@
+package nucleus
+
+import (
+	"context"
+	_ "github.com/mattn/go-sqlite3"
+	"google.golang.org/grpc"
+	"log"
+	"net"
+	pb "project-beachhead/grpc_interface"
+	sbiPcap "project-beachhead/southbound-interfaces"
+	"time"
+)
+
+// TODO XXX This has to be moved to some configuration file
+const (
+	cli_control_port = "localhost:55055"
+)
+
+// server is used to implement helloworld.GreeterServer.
+type server struct {
+	pb.UnimplementedGreeterServer
+}
+
+// SayHello implements helloworld.GreeterServer
+func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
+	log.Printf("Received: %v", in.GetName())
+	return &pb.HelloReply{Message: "Hello " + in.GetName()}, nil
+}
+
+func getCLIGoing() {
+	log.Println("Starting: GetCLIGoing")
+	// Boot-up the control interface for the cli
+	cliControlListener, err := net.Listen("tcp", cli_control_port)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+
+	cliControlServer := grpc.NewServer()
+
+	pb.RegisterGreeterServer(cliControlServer, &server{})
+	if err := cliControlServer.Serve(cliControlListener); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+	log.Println("Started: GetCLIGoing")
+}
+
+/*
+ * This function is used to start the core of the controller and any auxiliary services.
+ */
+
+// Next-up: backend database.
+
+func StartUp() {
+
+	log.Println("Starting my ducks")
+	go getCLIGoing()
+
+//	controller.AssembleJSON()
+
+	// Bootup the pcap interface
+	sbiPcap.GetPCAPGoing()
+
+	log.Println("and ready for take off")
+}
+
+/*
+ * nucleus.Run() is the "main loop" of the controller
+ */
+
+
+func Run() {
+	isRunning := true
+
+	for isRunning {
+		time.Sleep(10*time.Second)
+		isRunning = false
+	}
+
+	log.Println("Good bye....!")
+}
diff --git a/nucleus/root.go b/nucleus/root.go
new file mode 100644
index 0000000000000000000000000000000000000000..b555b2c1c7386b61ca32fa82056a338fcc3f7055
--- /dev/null
+++ b/nucleus/root.go
@@ -0,0 +1,40 @@
+package nucleus
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"os"
+	"project-beachhead/nucleus"
+)
+
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+}
+
+var versionCmd = &cobra.Command{
+  Use:   "version",
+  Short: "Print the version number of beachhead",
+  Long:  `A version is a version.`,
+  Run: func(cmd *cobra.Command, args []string) {
+    fmt.Println("Beachead -- unkown HEAD")
+  },
+}
+
+var rootCmd = &cobra.Command{
+	Use:   "beachhead",
+	Short: "A yet still incomplete attempt to build an network operating system, but...:-)",
+	Long: "Incomplete network operating system. Complete documentation is available at XXX",
+	Run: func(cmd *cobra.Command, args []string) {
+		// Do Stuff Here
+		nucleus.StartUp()
+		nucleus.Run()
+	},
+}
+
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+	fmt.Println(err)
+	os.Exit(1)
+	}
+}
diff --git a/yang-processor/gosdn.go b/yang-processor/gosdn.go
new file mode 100644
index 0000000000000000000000000000000000000000..73ad3b31c5901337d748b1c4129a3ed3a7e878c5
--- /dev/null
+++ b/yang-processor/gosdn.go
@@ -0,0 +1,9 @@
+// Package ocdemo is a demonstration package for use in the
+// getting_started ygot demo.
+package gosdn
+
+// This file is a placeholder in order to ensure that Go does not
+// find this directory to contain an empty package. The structs
+// required for the getting started demo should be generated through
+// go generate within the getting_started directory.
+
diff --git a/yang/iana-if-type.yang b/yang/iana-if-type.yang
new file mode 100644
index 0000000000000000000000000000000000000000..0b8b1b8d33dbbdc8f88b82840ac9b70a3f701c39
--- /dev/null
+++ b/yang/iana-if-type.yang
@@ -0,0 +1,1494 @@
+module iana-if-type {
+  namespace "urn:ietf:params:xml:ns:yang:iana-if-type";
+  prefix ianaift;
+  import ietf-interfaces {
+    prefix if;
+  }
+  organization "IANA";
+  contact
+    "        Internet Assigned Numbers Authority
+     Postal: ICANN
+             4676 Admiralty Way, Suite 330
+             Marina del Rey, CA 90292
+     Tel:    +1 310 823 9358
+     <mailto:iana@iana.org>";
+  description
+    "This YANG module defines YANG identities for IANA-registered
+     interface types.
+     This YANG module is maintained by IANA and reflects the
+     'ifType definitions' registry.
+     The latest revision of this YANG module can be obtained from
+     the IANA web site.
+     Requests for new values should be made to IANA via
+     email (iana@iana.org).
+     Copyright (c) 2014 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Simplified BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (http://trustee.ietf.org/license-info).
+     The initial version of this YANG module is part of RFC 7224;
+     see the RFC itself for full legal notices.";
+    reference
+      "IANA 'ifType definitions' registry.
+       <http://www.iana.org/assignments/smi-numbers>";
+  revision 2014-05-08 {
+    description
+      "Initial revision.";
+    reference
+      "RFC 7224: IANA Interface Type YANG Module";
+  }
+  identity iana-interface-type {
+    base if:interface-type;
+    description
+      "This identity is used as a base for all interface types
+       defined in the 'ifType definitions' registry.";
+  }
+  identity other {
+    base iana-interface-type;
+  }
+  identity regular1822 {
+    base iana-interface-type;
+  }
+  identity hdh1822 {
+    base iana-interface-type;
+  }
+  identity ddnX25 {
+    base iana-interface-type;
+  }
+  identity rfc877x25 {
+    base iana-interface-type;
+    reference
+      "RFC 1382 - SNMP MIB Extension for the X.25 Packet Layer";
+  }
+  identity ethernetCsmacd {
+    base iana-interface-type;
+    description
+      "For all Ethernet-like interfaces, regardless of speed,
+       as per RFC 3635.";
+    reference
+      "RFC 3635 - Definitions of Managed Objects for the
+                  Ethernet-like Interface Types";
+  }
+  identity iso88023Csmacd {
+    base iana-interface-type;
+    status deprecated;
+    description
+      "Deprecated via RFC 3635.
+       Use ethernetCsmacd(6) instead.";
+    reference
+      "RFC 3635 - Definitions of Managed Objects for the
+                  Ethernet-like Interface Types";
+  }
+  identity iso88024TokenBus {
+    base iana-interface-type;
+  }
+  identity iso88025TokenRing {
+    base iana-interface-type;
+  }
+  identity iso88026Man {
+    base iana-interface-type;
+  }
+  identity starLan {
+    base iana-interface-type;
+    status deprecated;
+    description
+      "Deprecated via RFC 3635.
+       Use ethernetCsmacd(6) instead.";
+    reference
+      "RFC 3635 - Definitions of Managed Objects for the
+                  Ethernet-like Interface Types";
+  }
+  identity proteon10Mbit {
+    base iana-interface-type;
+  }
+  identity proteon80Mbit {
+    base iana-interface-type;
+  }
+  identity hyperchannel {
+    base iana-interface-type;
+  }
+  identity fddi {
+    base iana-interface-type;
+    reference
+      "RFC 1512 - FDDI Management Information Base";
+  }
+  identity lapb {
+    base iana-interface-type;
+    reference
+      "RFC 1381 - SNMP MIB Extension for X.25 LAPB";
+  }
+  identity sdlc {
+    base iana-interface-type;
+  }
+  identity ds1 {
+    base iana-interface-type;
+    description
+      "DS1-MIB.";
+    reference
+      "RFC 4805 - Definitions of Managed Objects for the
+                  DS1, J1, E1, DS2, and E2 Interface Types";
+  }
+  identity e1 {
+    base iana-interface-type;
+    status obsolete;
+    description
+      "Obsolete; see DS1-MIB.";
+    reference
+      "RFC 4805 - Definitions of Managed Objects for the
+                  DS1, J1, E1, DS2, and E2 Interface Types";
+  }
+  identity basicISDN {
+    base iana-interface-type;
+    description
+      "No longer used.  See also RFC 2127.";
+  }
+  identity primaryISDN {
+    base iana-interface-type;
+    description
+      "No longer used.  See also RFC 2127.";
+  }
+  identity propPointToPointSerial {
+    base iana-interface-type;
+    description
+      "Proprietary serial.";
+  }
+  identity ppp {
+    base iana-interface-type;
+  }
+  identity softwareLoopback {
+    base iana-interface-type;
+  }
+  identity eon {
+    base iana-interface-type;
+    description
+      "CLNP over IP.";
+  }
+  identity ethernet3Mbit {
+    base iana-interface-type;
+  }
+  identity nsip {
+    base iana-interface-type;
+    description
+      "XNS over IP.";
+  }
+  identity slip {
+    base iana-interface-type;
+    description
+      "Generic SLIP.";
+  }
+  identity ultra {
+    base iana-interface-type;
+    description
+      "Ultra Technologies.";
+  }
+  identity ds3 {
+    base iana-interface-type;
+    description
+      "DS3-MIB.";
+    reference
+      "RFC 3896 - Definitions of Managed Objects for the
+                  DS3/E3 Interface Type";
+  }
+  identity sip {
+    base iana-interface-type;
+    description
+      "SMDS, coffee.";
+    reference
+      "RFC 1694 - Definitions of Managed Objects for SMDS
+                  Interfaces using SMIv2";
+  }
+  identity frameRelay {
+    base iana-interface-type;
+    description
+      "DTE only.";
+    reference
+      "RFC 2115 - Management Information Base for Frame Relay
+                  DTEs Using SMIv2";
+  }
+  identity rs232 {
+    base iana-interface-type;
+    reference
+      "RFC 1659 - Definitions of Managed Objects for RS-232-like
+                  Hardware Devices using SMIv2";
+  }
+  identity para {
+    base iana-interface-type;
+    description
+      "Parallel-port.";
+    reference
+      "RFC 1660 - Definitions of Managed Objects for
+                  Parallel-printer-like Hardware Devices using
+                  SMIv2";
+  }
+  identity arcnet {
+    base iana-interface-type;
+    description
+      "ARCnet.";
+  }
+  identity arcnetPlus {
+    base iana-interface-type;
+    description
+      "ARCnet Plus.";
+  }
+  identity atm {
+    base iana-interface-type;
+    description
+      "ATM cells.";
+  }
+  identity miox25 {
+    base iana-interface-type;
+    reference
+      "RFC 1461 - SNMP MIB extension for Multiprotocol
+                  Interconnect over X.25";
+  }
+  identity sonet {
+    base iana-interface-type;
+    description
+      "SONET or SDH.";
+  }
+  identity x25ple {
+    base iana-interface-type;
+    reference
+      "RFC 2127 - ISDN Management Information Base using SMIv2";
+  }
+  identity iso88022llc {
+    base iana-interface-type;
+  }
+  identity localTalk {
+    base iana-interface-type;
+  }
+  identity smdsDxi {
+    base iana-interface-type;
+  }
+  identity frameRelayService {
+    base iana-interface-type;
+    description
+      "FRNETSERV-MIB.";
+    reference
+      "RFC 2954 - Definitions of Managed Objects for Frame
+                  Relay Service";
+  }
+  identity v35 {
+    base iana-interface-type;
+  }
+  identity hssi {
+    base iana-interface-type;
+  }
+  identity hippi {
+    base iana-interface-type;
+  }
+  identity modem {
+    base iana-interface-type;
+    description
+      "Generic modem.";
+  }
+  identity aal5 {
+    base iana-interface-type;
+    description
+      "AAL5 over ATM.";
+  }
+  identity sonetPath {
+    base iana-interface-type;
+  }
+  identity sonetVT {
+    base iana-interface-type;
+  }
+  identity smdsIcip {
+    base iana-interface-type;
+    description
+      "SMDS InterCarrier Interface.";
+  }
+  identity propVirtual {
+    base iana-interface-type;
+    description
+      "Proprietary virtual/internal.";
+    reference
+      "RFC 2863 - The Interfaces Group MIB";
+  }
+  identity propMultiplexor {
+    base iana-interface-type;
+    description
+      "Proprietary multiplexing.";
+    reference
+      "RFC 2863 - The Interfaces Group MIB";
+  }
+  identity ieee80212 {
+    base iana-interface-type;
+    description
+      "100BaseVG.";
+  }
+  identity fibreChannel {
+    base iana-interface-type;
+    description
+      "Fibre Channel.";
+  }
+  identity hippiInterface {
+    base iana-interface-type;
+    description
+      "HIPPI interfaces.";
+  }
+  identity frameRelayInterconnect {
+    base iana-interface-type;
+    status obsolete;
+    description
+      "Obsolete; use either
+       frameRelay(32) or frameRelayService(44).";
+  }
+  identity aflane8023 {
+    base iana-interface-type;
+    description
+      "ATM Emulated LAN for 802.3.";
+  }
+  identity aflane8025 {
+    base iana-interface-type;
+    description
+      "ATM Emulated LAN for 802.5.";
+  }
+  identity cctEmul {
+    base iana-interface-type;
+    description
+      "ATM Emulated circuit.";
+  }
+  identity fastEther {
+    base iana-interface-type;
+    status deprecated;
+    description
+      "Obsoleted via RFC 3635.
+       ethernetCsmacd(6) should be used instead.";
+    reference
+      "RFC 3635 - Definitions of Managed Objects for the
+                  Ethernet-like Interface Types";
+  }
+  identity isdn {
+    base iana-interface-type;
+    description
+      "ISDN and X.25.";
+    reference
+      "RFC 1356 - Multiprotocol Interconnect on X.25 and ISDN
+                  in the Packet Mode";
+  }
+  identity v11 {
+    base iana-interface-type;
+    description
+      "CCITT V.11/X.21.";
+  }
+  identity v36 {
+    base iana-interface-type;
+    description
+      "CCITT V.36.";
+  }
+  identity g703at64k {
+    base iana-interface-type;
+    description
+      "CCITT G703 at 64Kbps.";
+  }
+  identity g703at2mb {
+    base iana-interface-type;
+    status obsolete;
+    description
+      "Obsolete; see DS1-MIB.";
+  }
+  identity qllc {
+    base iana-interface-type;
+    description
+      "SNA QLLC.";
+  }
+  identity fastEtherFX {
+    base iana-interface-type;
+    status deprecated;
+    description
+      "Obsoleted via RFC 3635.
+       ethernetCsmacd(6) should be used instead.";
+    reference
+      "RFC 3635 - Definitions of Managed Objects for the
+                  Ethernet-like Interface Types";
+  }
+  identity channel {
+    base iana-interface-type;
+    description
+      "Channel.";
+  }
+  identity ieee80211 {
+    base iana-interface-type;
+    description
+      "Radio spread spectrum.";
+  }
+  identity ibm370parChan {
+    base iana-interface-type;
+    description
+      "IBM System 360/370 OEMI Channel.";
+  }
+  identity escon {
+    base iana-interface-type;
+    description
+      "IBM Enterprise Systems Connection.";
+  }
+  identity dlsw {
+    base iana-interface-type;
+    description
+      "Data Link Switching.";
+  }
+  identity isdns {
+    base iana-interface-type;
+    description
+      "ISDN S/T interface.";
+  }
+  identity isdnu {
+    base iana-interface-type;
+    description
+      "ISDN U interface.";
+  }
+  identity lapd {
+    base iana-interface-type;
+    description
+      "Link Access Protocol D.";
+  }
+  identity ipSwitch {
+    base iana-interface-type;
+    description
+      "IP Switching Objects.";
+  }
+  identity rsrb {
+    base iana-interface-type;
+    description
+      "Remote Source Route Bridging.";
+  }
+  identity atmLogical {
+    base iana-interface-type;
+    description
+      "ATM Logical Port.";
+    reference
+      "RFC 3606 - Definitions of Supplemental Managed Objects
+                  for ATM Interface";
+  }
+  identity ds0 {
+    base iana-interface-type;
+    description
+      "Digital Signal Level 0.";
+    reference
+      "RFC 2494 - Definitions of Managed Objects for the DS0
+                  and DS0 Bundle Interface Type";
+  }
+  identity ds0Bundle {
+    base iana-interface-type;
+    description
+      "Group of ds0s on the same ds1.";
+    reference
+      "RFC 2494 - Definitions of Managed Objects for the DS0
+                  and DS0 Bundle Interface Type";
+  }
+  identity bsc {
+    base iana-interface-type;
+    description
+      "Bisynchronous Protocol.";
+  }
+  identity async {
+    base iana-interface-type;
+    description
+      "Asynchronous Protocol.";
+  }
+  identity cnr {
+    base iana-interface-type;
+    description
+      "Combat Net Radio.";
+  }
+  identity iso88025Dtr {
+    base iana-interface-type;
+    description
+      "ISO 802.5r DTR.";
+  }
+  identity eplrs {
+    base iana-interface-type;
+    description
+      "Ext Pos Loc Report Sys.";
+  }
+  identity arap {
+    base iana-interface-type;
+    description
+      "Appletalk Remote Access Protocol.";
+  }
+  identity propCnls {
+    base iana-interface-type;
+    description
+      "Proprietary Connectionless Protocol.";
+  }
+  identity hostPad {
+    base iana-interface-type;
+    description
+      "CCITT-ITU X.29 PAD Protocol.";
+  }
+  identity termPad {
+    base iana-interface-type;
+    description
+      "CCITT-ITU X.3 PAD Facility.";
+  }
+  identity frameRelayMPI {
+    base iana-interface-type;
+    description
+      "Multiproto Interconnect over FR.";
+  }
+  identity x213 {
+    base iana-interface-type;
+    description
+      "CCITT-ITU X213.";
+  }
+  identity adsl {
+    base iana-interface-type;
+    description
+      "Asymmetric Digital Subscriber Loop.";
+  }
+  identity radsl {
+    base iana-interface-type;
+    description
+      "Rate-Adapt. Digital Subscriber Loop.";
+  }
+  identity sdsl {
+    base iana-interface-type;
+    description
+      "Symmetric Digital Subscriber Loop.";
+  }
+  identity vdsl {
+    base iana-interface-type;
+    description
+      "Very H-Speed Digital Subscrib. Loop.";
+  }
+  identity iso88025CRFPInt {
+    base iana-interface-type;
+    description
+      "ISO 802.5 CRFP.";
+  }
+  identity myrinet {
+    base iana-interface-type;
+    description
+      "Myricom Myrinet.";
+  }
+  identity voiceEM {
+    base iana-interface-type;
+    description
+      "Voice recEive and transMit.";
+  }
+  identity voiceFXO {
+    base iana-interface-type;
+    description
+      "Voice Foreign Exchange Office.";
+  }
+  identity voiceFXS {
+    base iana-interface-type;
+    description
+      "Voice Foreign Exchange Station.";
+  }
+  identity voiceEncap {
+    base iana-interface-type;
+    description
+      "Voice encapsulation.";
+  }
+  identity voiceOverIp {
+    base iana-interface-type;
+    description
+      "Voice over IP encapsulation.";
+  }
+  identity atmDxi {
+    base iana-interface-type;
+    description
+      "ATM DXI.";
+  }
+  identity atmFuni {
+    base iana-interface-type;
+    description
+      "ATM FUNI.";
+  }
+  identity atmIma {
+    base iana-interface-type;
+    description
+      "ATM IMA.";
+  }
+  identity pppMultilinkBundle {
+    base iana-interface-type;
+    description
+      "PPP Multilink Bundle.";
+  }
+  identity ipOverCdlc {
+    base iana-interface-type;
+    description
+      "IBM ipOverCdlc.";
+  }
+  identity ipOverClaw {
+    base iana-interface-type;
+    description
+      "IBM Common Link Access to Workstn.";
+  }
+  identity stackToStack {
+    base iana-interface-type;
+    description
+      "IBM stackToStack.";
+  }
+  identity virtualIpAddress {
+    base iana-interface-type;
+    description
+      "IBM VIPA.";
+  }
+  identity mpc {
+    base iana-interface-type;
+    description
+      "IBM multi-protocol channel support.";
+  }
+  identity ipOverAtm {
+    base iana-interface-type;
+    description
+      "IBM ipOverAtm.";
+    reference
+      "RFC 2320 - Definitions of Managed Objects for Classical IP
+                  and ARP Over ATM Using SMIv2 (IPOA-MIB)";
+  }
+  identity iso88025Fiber {
+    base iana-interface-type;
+    description
+      "ISO 802.5j Fiber Token Ring.";
+  }
+  identity tdlc {
+    base iana-interface-type;
+    description
+      "IBM twinaxial data link control.";
+  }
+  identity gigabitEthernet {
+    base iana-interface-type;
+    status deprecated;
+    description
+      "Obsoleted via RFC 3635.
+       ethernetCsmacd(6) should be used instead.";
+    reference
+      "RFC 3635 - Definitions of Managed Objects for the
+                  Ethernet-like Interface Types";
+  }
+  identity hdlc {
+    base iana-interface-type;
+    description
+      "HDLC.";
+  }
+  identity lapf {
+    base iana-interface-type;
+    description
+      "LAP F.";
+  }
+  identity v37 {
+    base iana-interface-type;
+    description
+      "V.37.";
+  }
+  identity x25mlp {
+    base iana-interface-type;
+    description
+      "Multi-Link Protocol.";
+  }
+  identity x25huntGroup {
+    base iana-interface-type;
+    description
+      "X25 Hunt Group.";
+  }
+  identity transpHdlc {
+    base iana-interface-type;
+    description
+      "Transp HDLC.";
+  }
+  identity interleave {
+    base iana-interface-type;
+    description
+      "Interleave channel.";
+  }
+  identity fast {
+    base iana-interface-type;
+    description
+      "Fast channel.";
+  }
+  identity ip {
+    base iana-interface-type;
+    description
+      "IP (for APPN HPR in IP networks).";
+  }
+  identity docsCableMaclayer {
+    base iana-interface-type;
+    description
+      "CATV Mac Layer.";
+  }
+  identity docsCableDownstream {
+    base iana-interface-type;
+    description
+      "CATV Downstream interface.";
+  }
+  identity docsCableUpstream {
+    base iana-interface-type;
+    description
+      "CATV Upstream interface.";
+  }
+  identity a12MppSwitch {
+    base iana-interface-type;
+    description
+      "Avalon Parallel Processor.";
+  }
+  identity tunnel {
+    base iana-interface-type;
+    description
+      "Encapsulation interface.";
+  }
+  identity coffee {
+    base iana-interface-type;
+    description
+      "Coffee pot.";
+    reference
+      "RFC 2325 - Coffee MIB";
+  }
+  identity ces {
+    base iana-interface-type;
+    description
+      "Circuit Emulation Service.";
+  }
+  identity atmSubInterface {
+    base iana-interface-type;
+    description
+      "ATM Sub Interface.";
+  }
+  identity l2vlan {
+    base iana-interface-type;
+    description
+      "Layer 2 Virtual LAN using 802.1Q.";
+  }
+  identity l3ipvlan {
+    base iana-interface-type;
+    description
+      "Layer 3 Virtual LAN using IP.";
+  }
+  identity l3ipxvlan {
+    base iana-interface-type;
+    description
+      "Layer 3 Virtual LAN using IPX.";
+  }
+  identity digitalPowerline {
+    base iana-interface-type;
+    description
+      "IP over Power Lines.";
+  }
+  identity mediaMailOverIp {
+    base iana-interface-type;
+    description
+      "Multimedia Mail over IP.";
+  }
+  identity dtm {
+    base iana-interface-type;
+    description
+      "Dynamic synchronous Transfer Mode.";
+  }
+  identity dcn {
+    base iana-interface-type;
+    description
+      "Data Communications Network.";
+  }
+  identity ipForward {
+    base iana-interface-type;
+    description
+      "IP Forwarding Interface.";
+  }
+  identity msdsl {
+    base iana-interface-type;
+    description
+      "Multi-rate Symmetric DSL.";
+  }
+  identity ieee1394 {
+    base iana-interface-type;
+    description
+      "IEEE1394 High Performance Serial Bus.";
+  }
+  identity if-gsn {
+    base iana-interface-type;
+    description
+      "HIPPI-6400.";
+  }
+  identity dvbRccMacLayer {
+    base iana-interface-type;
+    description
+      "DVB-RCC MAC Layer.";
+  }
+  identity dvbRccDownstream {
+    base iana-interface-type;
+    description
+      "DVB-RCC Downstream Channel.";
+  }
+  identity dvbRccUpstream {
+    base iana-interface-type;
+    description
+      "DVB-RCC Upstream Channel.";
+  }
+  identity atmVirtual {
+    base iana-interface-type;
+    description
+      "ATM Virtual Interface.";
+  }
+  identity mplsTunnel {
+    base iana-interface-type;
+    description
+      "MPLS Tunnel Virtual Interface.";
+  }
+  identity srp {
+    base iana-interface-type;
+    description
+      "Spatial Reuse Protocol.";
+  }
+  identity voiceOverAtm {
+    base iana-interface-type;
+    description
+      "Voice over ATM.";
+  }
+  identity voiceOverFrameRelay {
+    base iana-interface-type;
+    description
+      "Voice Over Frame Relay.";
+  }
+  identity idsl {
+    base iana-interface-type;
+    description
+      "Digital Subscriber Loop over ISDN.";
+  }
+  identity compositeLink {
+    base iana-interface-type;
+    description
+      "Avici Composite Link Interface.";
+  }
+  identity ss7SigLink {
+    base iana-interface-type;
+    description
+      "SS7 Signaling Link.";
+  }
+  identity propWirelessP2P {
+    base iana-interface-type;
+    description
+      "Prop. P2P wireless interface.";
+  }
+  identity frForward {
+    base iana-interface-type;
+    description
+      "Frame Forward Interface.";
+  }
+  identity rfc1483 {
+    base iana-interface-type;
+    description
+      "Multiprotocol over ATM AAL5.";
+    reference
+      "RFC 1483 - Multiprotocol Encapsulation over ATM
+                  Adaptation Layer 5";
+  }
+  identity usb {
+    base iana-interface-type;
+    description
+      "USB Interface.";
+  }
+  identity ieee8023adLag {
+    base iana-interface-type;
+    description
+      "IEEE 802.3ad Link Aggregate.";
+  }
+  identity bgppolicyaccounting {
+    base iana-interface-type;
+    description
+      "BGP Policy Accounting.";
+  }
+  identity frf16MfrBundle {
+    base iana-interface-type;
+    description
+      "FRF.16 Multilink Frame Relay.";
+  }
+  identity h323Gatekeeper {
+    base iana-interface-type;
+    description
+      "H323 Gatekeeper.";
+  }
+  identity h323Proxy {
+    base iana-interface-type;
+    description
+      "H323 Voice and Video Proxy.";
+  }
+  identity mpls {
+    base iana-interface-type;
+    description
+      "MPLS.";
+  }
+  identity mfSigLink {
+    base iana-interface-type;
+    description
+      "Multi-frequency signaling link.";
+  }
+  identity hdsl2 {
+    base iana-interface-type;
+    description
+      "High Bit-Rate DSL - 2nd generation.";
+  }
+  identity shdsl {
+    base iana-interface-type;
+    description
+      "Multirate HDSL2.";
+  }
+  identity ds1FDL {
+    base iana-interface-type;
+    description
+      "Facility Data Link (4Kbps) on a DS1.";
+  }
+  identity pos {
+    base iana-interface-type;
+    description
+      "Packet over SONET/SDH Interface.";
+  }
+  identity dvbAsiIn {
+    base iana-interface-type;
+    description
+      "DVB-ASI Input.";
+  }
+  identity dvbAsiOut {
+    base iana-interface-type;
+    description
+      "DVB-ASI Output.";
+  }
+  identity plc {
+    base iana-interface-type;
+    description
+      "Power Line Communications.";
+  }
+  identity nfas {
+    base iana-interface-type;
+    description
+      "Non-Facility Associated Signaling.";
+  }
+  identity tr008 {
+    base iana-interface-type;
+    description
+      "TR008.";
+  }
+  identity gr303RDT {
+    base iana-interface-type;
+    description
+      "Remote Digital Terminal.";
+  }
+  identity gr303IDT {
+    base iana-interface-type;
+    description
+      "Integrated Digital Terminal.";
+  }
+  identity isup {
+    base iana-interface-type;
+    description
+      "ISUP.";
+  }
+  identity propDocsWirelessMaclayer {
+    base iana-interface-type;
+    description
+      "Cisco proprietary Maclayer.";
+  }
+  identity propDocsWirelessDownstream {
+    base iana-interface-type;
+    description
+      "Cisco proprietary Downstream.";
+  }
+  identity propDocsWirelessUpstream {
+    base iana-interface-type;
+    description
+      "Cisco proprietary Upstream.";
+  }
+  identity hiperlan2 {
+    base iana-interface-type;
+    description
+      "HIPERLAN Type 2 Radio Interface.";
+  }
+  identity propBWAp2Mp {
+    base iana-interface-type;
+    description
+      "PropBroadbandWirelessAccesspt2Multipt (use of this value
+       for IEEE 802.16 WMAN interfaces as per IEEE Std 802.16f
+       is deprecated, and ieee80216WMAN(237) should be used
+       instead).";
+  }
+  identity sonetOverheadChannel {
+    base iana-interface-type;
+    description
+      "SONET Overhead Channel.";
+  }
+  identity digitalWrapperOverheadChannel {
+    base iana-interface-type;
+    description
+      "Digital Wrapper.";
+  }
+  identity aal2 {
+    base iana-interface-type;
+    description
+      "ATM adaptation layer 2.";
+  }
+  identity radioMAC {
+    base iana-interface-type;
+    description
+      "MAC layer over radio links.";
+  }
+  identity atmRadio {
+    base iana-interface-type;
+    description
+      "ATM over radio links.";
+  }
+  identity imt {
+    base iana-interface-type;
+    description
+      "Inter-Machine Trunks.";
+  }
+  identity mvl {
+    base iana-interface-type;
+    description
+      "Multiple Virtual Lines DSL.";
+  }
+  identity reachDSL {
+    base iana-interface-type;
+    description
+      "Long Reach DSL.";
+  }
+  identity frDlciEndPt {
+    base iana-interface-type;
+    description
+      "Frame Relay DLCI End Point.";
+  }
+  identity atmVciEndPt {
+    base iana-interface-type;
+    description
+      "ATM VCI End Point.";
+  }
+  identity opticalChannel {
+    base iana-interface-type;
+    description
+      "Optical Channel.";
+  }
+  identity opticalTransport {
+    base iana-interface-type;
+    description
+      "Optical Transport.";
+  }
+  identity propAtm {
+    base iana-interface-type;
+    description
+      "Proprietary ATM.";
+  }
+  identity voiceOverCable {
+    base iana-interface-type;
+    description
+      "Voice Over Cable Interface.";
+  }
+  identity infiniband {
+    base iana-interface-type;
+    description
+      "Infiniband.";
+  }
+  identity teLink {
+    base iana-interface-type;
+    description
+      "TE Link.";
+  }
+  identity q2931 {
+    base iana-interface-type;
+    description
+      "Q.2931.";
+  }
+  identity virtualTg {
+    base iana-interface-type;
+    description
+      "Virtual Trunk Group.";
+  }
+  identity sipTg {
+    base iana-interface-type;
+    description
+      "SIP Trunk Group.";
+  }
+  identity sipSig {
+    base iana-interface-type;
+    description
+      "SIP Signaling.";
+  }
+  identity docsCableUpstreamChannel {
+    base iana-interface-type;
+    description
+      "CATV Upstream Channel.";
+  }
+  identity econet {
+    base iana-interface-type;
+    description
+      "Acorn Econet.";
+  }
+  identity pon155 {
+    base iana-interface-type;
+    description
+      "FSAN 155Mb Symetrical PON interface.";
+  }
+  identity pon622 {
+    base iana-interface-type;
+    description
+      "FSAN 622Mb Symetrical PON interface.";
+  }
+  identity bridge {
+    base iana-interface-type;
+    description
+      "Transparent bridge interface.";
+  }
+  identity linegroup {
+    base iana-interface-type;
+    description
+      "Interface common to multiple lines.";
+  }
+  identity voiceEMFGD {
+    base iana-interface-type;
+    description
+      "Voice E&M Feature Group D.";
+  }
+  identity voiceFGDEANA {
+    base iana-interface-type;
+    description
+      "Voice FGD Exchange Access North American.";
+  }
+  identity voiceDID {
+    base iana-interface-type;
+    description
+      "Voice Direct Inward Dialing.";
+  }
+  identity mpegTransport {
+    base iana-interface-type;
+    description
+      "MPEG transport interface.";
+  }
+  identity sixToFour {
+    base iana-interface-type;
+    status deprecated;
+    description
+      "6to4 interface (DEPRECATED).";
+    reference
+      "RFC 4087 - IP Tunnel MIB";
+  }
+  identity gtp {
+    base iana-interface-type;
+    description
+      "GTP (GPRS Tunneling Protocol).";
+  }
+  identity pdnEtherLoop1 {
+    base iana-interface-type;
+    description
+      "Paradyne EtherLoop 1.";
+  }
+  identity pdnEtherLoop2 {
+    base iana-interface-type;
+    description
+      "Paradyne EtherLoop 2.";
+  }
+  identity opticalChannelGroup {
+    base iana-interface-type;
+    description
+      "Optical Channel Group.";
+  }
+  identity homepna {
+    base iana-interface-type;
+    description
+      "HomePNA ITU-T G.989.";
+  }
+  identity gfp {
+    base iana-interface-type;
+    description
+      "Generic Framing Procedure (GFP).";
+  }
+  identity ciscoISLvlan {
+    base iana-interface-type;
+    description
+      "Layer 2 Virtual LAN using Cisco ISL.";
+  }
+  identity actelisMetaLOOP {
+    base iana-interface-type;
+    description
+      "Acteleis proprietary MetaLOOP High Speed Link.";
+  }
+  identity fcipLink {
+    base iana-interface-type;
+    description
+      "FCIP Link.";
+  }
+  identity rpr {
+    base iana-interface-type;
+    description
+      "Resilient Packet Ring Interface Type.";
+  }
+  identity qam {
+    base iana-interface-type;
+    description
+      "RF Qam Interface.";
+  }
+  identity lmp {
+    base iana-interface-type;
+    description
+      "Link Management Protocol.";
+    reference
+      "RFC 4327 - Link Management Protocol (LMP) Management
+                  Information Base (MIB)";
+  }
+  identity cblVectaStar {
+    base iana-interface-type;
+    description
+      "Cambridge Broadband Networks Limited VectaStar.";
+  }
+  identity docsCableMCmtsDownstream {
+    base iana-interface-type;
+    description
+      "CATV Modular CMTS Downstream Interface.";
+  }
+  identity adsl2 {
+    base iana-interface-type;
+    status deprecated;
+    description
+      "Asymmetric Digital Subscriber Loop Version 2
+       (DEPRECATED/OBSOLETED - please use adsl2plus(238)
+       instead).";
+    reference
+      "RFC 4706 - Definitions of Managed Objects for Asymmetric
+                  Digital Subscriber Line 2 (ADSL2)";
+  }
+  identity macSecControlledIF {
+    base iana-interface-type;
+    description
+      "MACSecControlled.";
+  }
+  identity macSecUncontrolledIF {
+    base iana-interface-type;
+    description
+      "MACSecUncontrolled.";
+  }
+  identity aviciOpticalEther {
+    base iana-interface-type;
+    description
+      "Avici Optical Ethernet Aggregate.";
+  }
+  identity atmbond {
+    base iana-interface-type;
+    description
+      "atmbond.";
+  }
+  identity voiceFGDOS {
+    base iana-interface-type;
+    description
+      "Voice FGD Operator Services.";
+  }
+  identity mocaVersion1 {
+    base iana-interface-type;
+    description
+      "MultiMedia over Coax Alliance (MoCA) Interface
+       as documented in information provided privately to IANA.";
+  }
+  identity ieee80216WMAN {
+    base iana-interface-type;
+    description
+      "IEEE 802.16 WMAN interface.";
+  }
+  identity adsl2plus {
+    base iana-interface-type;
+    description
+      "Asymmetric Digital Subscriber Loop Version 2 -
+       Version 2 Plus and all variants.";
+  }
+  identity dvbRcsMacLayer {
+    base iana-interface-type;
+    description
+      "DVB-RCS MAC Layer.";
+    reference
+      "RFC 5728 - The SatLabs Group DVB-RCS MIB";
+  }
+  identity dvbTdm {
+    base iana-interface-type;
+    description
+      "DVB Satellite TDM.";
+    reference
+      "RFC 5728 - The SatLabs Group DVB-RCS MIB";
+  }
+  identity dvbRcsTdma {
+    base iana-interface-type;
+    description
+      "DVB-RCS TDMA.";
+    reference
+      "RFC 5728 - The SatLabs Group DVB-RCS MIB";
+  }
+  identity x86Laps {
+    base iana-interface-type;
+    description
+      "LAPS based on ITU-T X.86/Y.1323.";
+  }
+  identity wwanPP {
+    base iana-interface-type;
+    description
+      "3GPP WWAN.";
+  }
+  identity wwanPP2 {
+    base iana-interface-type;
+    description
+      "3GPP2 WWAN.";
+  }
+  identity voiceEBS {
+    base iana-interface-type;
+    description
+      "Voice P-phone EBS physical interface.";
+  }
+  identity ifPwType {
+    base iana-interface-type;
+    description
+      "Pseudowire interface type.";
+    reference
+      "RFC 5601 - Pseudowire (PW) Management Information Base (MIB)";
+  }
+  identity ilan {
+    base iana-interface-type;
+    description
+      "Internal LAN on a bridge per IEEE 802.1ap.";
+  }
+  identity pip {
+    base iana-interface-type;
+    description
+      "Provider Instance Port on a bridge per IEEE 802.1ah PBB.";
+  }
+  identity aluELP {
+    base iana-interface-type;
+    description
+      "Alcatel-Lucent Ethernet Link Protection.";
+  }
+  identity gpon {
+    base iana-interface-type;
+    description
+      "Gigabit-capable passive optical networks (G-PON) as per
+       ITU-T G.948.";
+  }
+  identity vdsl2 {
+    base iana-interface-type;
+    description
+      "Very high speed digital subscriber line Version 2
+       (as per ITU-T Recommendation G.993.2).";
+    reference
+      "RFC 5650 - Definitions of Managed Objects for Very High
+                  Speed Digital Subscriber Line 2 (VDSL2)";
+  }
+  identity capwapDot11Profile {
+    base iana-interface-type;
+    description
+      "WLAN Profile Interface.";
+    reference
+      "RFC 5834 - Control and Provisioning of Wireless Access
+                  Points (CAPWAP) Protocol Binding MIB for
+                  IEEE 802.11";
+  }
+  identity capwapDot11Bss {
+    base iana-interface-type;
+    description
+      "WLAN BSS Interface.";
+    reference
+      "RFC 5834 - Control and Provisioning of Wireless Access
+                  Points (CAPWAP) Protocol Binding MIB for
+                  IEEE 802.11";
+  }
+  identity capwapWtpVirtualRadio {
+    base iana-interface-type;
+    description
+      "WTP Virtual Radio Interface.";
+    reference
+      "RFC 5833 - Control and Provisioning of Wireless Access
+                  Points (CAPWAP) Protocol Base MIB";
+  }
+  identity bits {
+    base iana-interface-type;
+    description
+      "bitsport.";
+  }
+  identity docsCableUpstreamRfPort {
+    base iana-interface-type;
+    description
+      "DOCSIS CATV Upstream RF Port.";
+  }
+  identity cableDownstreamRfPort {
+    base iana-interface-type;
+    description
+      "CATV downstream RF Port.";
+  }
+  identity vmwareVirtualNic {
+    base iana-interface-type;
+    description
+      "VMware Virtual Network Interface.";
+  }
+  identity ieee802154 {
+    base iana-interface-type;
+    description
+      "IEEE 802.15.4 WPAN interface.";
+    reference
+      "IEEE 802.15.4-2006";
+  }
+  identity otnOdu {
+    base iana-interface-type;
+    description
+      "OTN Optical Data Unit.";
+  }
+  identity otnOtu {
+    base iana-interface-type;
+    description
+      "OTN Optical channel Transport Unit.";
+  }
+  identity ifVfiType {
+    base iana-interface-type;
+    description
+      "VPLS Forwarding Instance Interface Type.";
+  }
+  identity g9981 {
+    base iana-interface-type;
+    description
+      "G.998.1 bonded interface.";
+  }
+  identity g9982 {
+    base iana-interface-type;
+    description
+      "G.998.2 bonded interface.";
+  }
+  identity g9983 {
+    base iana-interface-type;
+    description
+      "G.998.3 bonded interface.";
+  }
+  identity aluEpon {
+    base iana-interface-type;
+    description
+      "Ethernet Passive Optical Networks (E-PON).";
+  }
+  identity aluEponOnu {
+    base iana-interface-type;
+    description
+      "EPON Optical Network Unit.";
+  }
+  identity aluEponPhysicalUni {
+    base iana-interface-type;
+    description
+      "EPON physical User to Network interface.";
+  }
+  identity aluEponLogicalLink {
+    base iana-interface-type;
+    description
+      "The emulation of a point-to-point link over the EPON
+       layer.";
+  }
+  identity aluGponOnu {
+    base iana-interface-type;
+    description
+      "GPON Optical Network Unit.";
+    reference
+      "ITU-T G.984.2";
+  }
+  identity aluGponPhysicalUni {
+    base iana-interface-type;
+    description
+      "GPON physical User to Network interface.";
+    reference
+      "ITU-T G.984.2";
+  }
+  identity vmwareNicTeam {
+    base iana-interface-type;
+    description
+      "VMware NIC Team.";
+  }
+}
diff --git a/yang/ietf-inet-types.yang b/yang/ietf-inet-types.yang
new file mode 100644
index 0000000000000000000000000000000000000000..08fb3b536b21f500a28f50b22b53cc32a3305c8f
--- /dev/null
+++ b/yang/ietf-inet-types.yang
@@ -0,0 +1,400 @@
+module ietf-inet-types {
+  namespace "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+  prefix "inet";
+  organization
+   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+  contact
+   "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+  description
+   "This module contains a collection of generally useful derived
+    YANG data types for Internet addresses and related things.
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+  revision 2013-07-15 {
+    description
+     "This revision adds the following new data types:
+      - ip-address-no-zone
+      - ipv4-address-no-zone
+      - ipv6-address-no-zone";
+    reference
+     "RFC 6991: Common YANG Data Types";
+  }
+  revision 2010-09-24 {
+    description
+     "Initial revision.";
+    reference
+     "RFC 6021: Common YANG Data Types";
+  }
+  /*** collection of types related to protocol fields ***/
+  typedef ip-version {
+    type enumeration {
+      enum unknown {
+        value "0";
+        description
+         "An unknown or unspecified version of the Internet
+          protocol.";
+      }
+      enum ipv4 {
+        value "1";
+        description
+         "The IPv4 protocol as defined in RFC 791.";
+      }
+      enum ipv6 {
+        value "2";
+        description
+         "The IPv6 protocol as defined in RFC 2460.";
+      }
+    }
+    description
+     "This value represents the version of the IP protocol.
+      In the value set and its semantics, this type is equivalent
+      to the InetVersion textual convention of the SMIv2.";
+    reference
+     "RFC  791: Internet Protocol
+      RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
+      RFC 4001: Textual Conventions for Internet Network Addresses";
+  }
+  typedef dscp {
+    type uint8 {
+      range "0..63";
+    }
+    description
+     "The dscp type represents a Differentiated Services Code Point
+      that may be used for marking packets in a traffic stream.
+      In the value set and its semantics, this type is equivalent
+      to the Dscp textual convention of the SMIv2.";
+    reference
+     "RFC 3289: Management Information Base for the Differentiated
+                Services Architecture
+      RFC 2474: Definition of the Differentiated Services Field
+                (DS Field) in the IPv4 and IPv6 Headers
+      RFC 2780: IANA Allocation Guidelines For Values In
+                the Internet Protocol and Related Headers";
+  }
+  typedef ipv6-flow-label {
+    type uint32 {
+      range "0..1048575";
+    }
+    description
+     "The ipv6-flow-label type represents the flow identifier or Flow
+      Label in an IPv6 packet header that may be used to
+      discriminate traffic flows.
+      In the value set and its semantics, this type is equivalent
+      to the IPv6FlowLabel textual convention of the SMIv2.";
+    reference
+     "RFC 3595: Textual Conventions for IPv6 Flow Label
+      RFC 2460: Internet Protocol, Version 6 (IPv6) Specification";
+  }
+  typedef port-number {
+    type uint16 {
+      range "0..65535";
+    }
+    description
+     "The port-number type represents a 16-bit port number of an
+      Internet transport-layer protocol such as UDP, TCP, DCCP, or
+      SCTP.  Port numbers are assigned by IANA.  A current list of
+      all assignments is available from <http://www.iana.org/>.
+      Note that the port number value zero is reserved by IANA.  In
+      situations where the value zero does not make sense, it can
+      be excluded by subtyping the port-number type.
+      In the value set and its semantics, this type is equivalent
+      to the InetPortNumber textual convention of the SMIv2.";
+    reference
+     "RFC  768: User Datagram Protocol
+      RFC  793: Transmission Control Protocol
+      RFC 4960: Stream Control Transmission Protocol
+      RFC 4340: Datagram Congestion Control Protocol (DCCP)
+      RFC 4001: Textual Conventions for Internet Network Addresses";
+  }
+  /*** collection of types related to autonomous systems ***/
+  typedef as-number {
+    type uint32;
+    description
+     "The as-number type represents autonomous system numbers
+      which identify an Autonomous System (AS).  An AS is a set
+      of routers under a single technical administration, using
+      an interior gateway protocol and common metrics to route
+      packets within the AS, and using an exterior gateway
+      protocol to route packets to other ASes.  IANA maintains
+      the AS number space and has delegated large parts to the
+      regional registries.
+      Autonomous system numbers were originally limited to 16
+      bits.  BGP extensions have enlarged the autonomous system
+      number space to 32 bits.  This type therefore uses an uint32
+      base type without a range restriction in order to support
+      a larger autonomous system number space.
+      In the value set and its semantics, this type is equivalent
+      to the InetAutonomousSystemNumber textual convention of
+      the SMIv2.";
+    reference
+     "RFC 1930: Guidelines for creation, selection, and registration
+                of an Autonomous System (AS)
+      RFC 4271: A Border Gateway Protocol 4 (BGP-4)
+      RFC 4001: Textual Conventions for Internet Network Addresses
+      RFC 6793: BGP Support for Four-Octet Autonomous System (AS)
+                Number Space";
+  }
+  /*** collection of types related to IP addresses and hostnames ***/
+  typedef ip-address {
+    type union {
+      type inet:ipv4-address;
+      type inet:ipv6-address;
+    }
+    description
+     "The ip-address type represents an IP address and is IP
+      version neutral.  The format of the textual representation
+      implies the IP version.  This type supports scoped addresses
+      by allowing zone identifiers in the address format.";
+    reference
+     "RFC 4007: IPv6 Scoped Address Architecture";
+  }
+  typedef ipv4-address {
+    type string {
+      pattern
+        '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+      +  '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+      + '(%[\p{N}\p{L}]+)?';
+    }
+    description
+      "The ipv4-address type represents an IPv4 address in
+       dotted-quad notation.  The IPv4 address may include a zone
+       index, separated by a % sign.
+       The zone index is used to disambiguate identical address
+       values.  For link-local addresses, the zone index will
+       typically be the interface index number or the name of an
+       interface.  If the zone index is not present, the default
+       zone of the device will be used.
+       The canonical format for the zone index is the numerical
+       format";
+  }
+  typedef ipv6-address {
+    type string {
+      pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
+            + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
+            + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
+            + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
+            + '(%[\p{N}\p{L}]+)?';
+      pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
+            + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
+            + '(%.+)?';
+    }
+    description
+     "The ipv6-address type represents an IPv6 address in full,
+      mixed, shortened, and shortened-mixed notation.  The IPv6
+      address may include a zone index, separated by a % sign.
+      The zone index is used to disambiguate identical address
+      values.  For link-local addresses, the zone index will
+      typically be the interface index number or the name of an
+      interface.  If the zone index is not present, the default
+      zone of the device will be used.
+      The canonical format of IPv6 addresses uses the textual
+      representation defined in Section 4 of RFC 5952.  The
+      canonical format for the zone index is the numerical
+      format as described in Section 11.2 of RFC 4007.";
+    reference
+     "RFC 4291: IP Version 6 Addressing Architecture
+      RFC 4007: IPv6 Scoped Address Architecture
+      RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+  typedef ip-address-no-zone {
+    type union {
+      type inet:ipv4-address-no-zone;
+      type inet:ipv6-address-no-zone;
+    }
+    description
+     "The ip-address-no-zone type represents an IP address and is
+      IP version neutral.  The format of the textual representation
+      implies the IP version.  This type does not support scoped
+      addresses since it does not allow zone identifiers in the
+      address format.";
+    reference
+     "RFC 4007: IPv6 Scoped Address Architecture";
+  }
+  typedef ipv4-address-no-zone {
+    type inet:ipv4-address {
+      pattern '[0-9\.]*';
+    }
+    description
+      "An IPv4 address without a zone index.  This type, derived from
+       ipv4-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+  }
+  typedef ipv6-address-no-zone {
+    type inet:ipv6-address {
+      pattern '[0-9a-fA-F:\.]*';
+    }
+    description
+      "An IPv6 address without a zone index.  This type, derived from
+       ipv6-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+    reference
+     "RFC 4291: IP Version 6 Addressing Architecture
+      RFC 4007: IPv6 Scoped Address Architecture
+      RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+  typedef ip-prefix {
+    type union {
+      type inet:ipv4-prefix;
+      type inet:ipv6-prefix;
+    }
+    description
+     "The ip-prefix type represents an IP prefix and is IP
+      version neutral.  The format of the textual representations
+      implies the IP version.";
+  }
+  typedef ipv4-prefix {
+    type string {
+      pattern
+         '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+       +  '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+       + '/(([0-9])|([1-2][0-9])|(3[0-2]))';
+    }
+    description
+     "The ipv4-prefix type represents an IPv4 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 32.
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+      The canonical format of an IPv4 prefix has all bits of
+      the IPv4 address set to zero that are not part of the
+      IPv4 prefix.";
+  }
+  typedef ipv6-prefix {
+    type string {
+      pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
+            + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
+            + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
+            + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
+            + '(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
+      pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
+            + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
+            + '(/.+)';
+    }
+    description
+     "The ipv6-prefix type represents an IPv6 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 128.
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+      The IPv6 address should have all bits that do not belong
+      to the prefix set to zero.
+      The canonical format of an IPv6 prefix has all bits of
+      the IPv6 address set to zero that are not part of the
+      IPv6 prefix.  Furthermore, the IPv6 address is represented
+      as defined in Section 4 of RFC 5952.";
+    reference
+     "RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+  /*** collection of domain name and URI types ***/
+  typedef domain-name {
+    type string {
+      pattern
+        '((([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.)*'
+      + '([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.?)'
+      + '|\.';
+      length "1..253";
+    }
+    description
+     "The domain-name type represents a DNS domain name.  The
+      name SHOULD be fully qualified whenever possible.
+      Internet domain names are only loosely specified.  Section
+      3.5 of RFC 1034 recommends a syntax (modified in Section
+      2.1 of RFC 1123).  The pattern above is intended to allow
+      for current practice in domain name use, and some possible
+      future expansion.  It is designed to hold various types of
+      domain names, including names used for A or AAAA records
+      (host names) and other records, such as SRV records.  Note
+      that Internet host names have a stricter syntax (described
+      in RFC 952) than the DNS recommendations in RFCs 1034 and
+      1123, and that systems that want to store host names in
+      schema nodes using the domain-name type are recommended to
+      adhere to this stricter standard to ensure interoperability.
+      The encoding of DNS names in the DNS protocol is limited
+      to 255 characters.  Since the encoding consists of labels
+      prefixed by a length bytes and there is a trailing NULL
+      byte, only 253 characters can appear in the textual dotted
+      notation.
+      The description clause of schema nodes using the domain-name
+      type MUST describe when and how these names are resolved to
+      IP addresses.  Note that the resolution of a domain-name value
+      may require to query multiple DNS records (e.g., A for IPv4
+      and AAAA for IPv6).  The order of the resolution process and
+      which DNS record takes precedence can either be defined
+      explicitly or may depend on the configuration of the
+      resolver.
+      Domain-name values use the US-ASCII encoding.  Their canonical
+      format uses lowercase US-ASCII characters.  Internationalized
+      domain names MUST be A-labels as per RFC 5890.";
+    reference
+     "RFC  952: DoD Internet Host Table Specification
+      RFC 1034: Domain Names - Concepts and Facilities
+      RFC 1123: Requirements for Internet Hosts -- Application
+                and Support
+      RFC 2782: A DNS RR for specifying the location of services
+                (DNS SRV)
+      RFC 5890: Internationalized Domain Names in Applications
+                (IDNA): Definitions and Document Framework";
+  }
+  typedef host {
+    type union {
+      type inet:ip-address;
+      type inet:domain-name;
+    }
+    description
+     "The host type represents either an IP address or a DNS
+      domain name.";
+  }
+  typedef uri {
+    type string;
+    description
+     "The uri type represents a Uniform Resource Identifier
+      (URI) as defined by STD 66.
+      Objects using the uri type MUST be in US-ASCII encoding,
+      and MUST be normalized as described by RFC 3986 Sections
+      6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
+      percent-encoding is removed, and all case-insensitive
+      characters are set to lowercase except for hexadecimal
+      digits, which are normalized to uppercase as described in
+      Section 6.2.2.1.
+      The purpose of this normalization is to help provide
+      unique URIs.  Note that this normalization is not
+      sufficient to provide uniqueness.  Two URIs that are
+      textually distinct after this normalization may still be
+      equivalent.
+      Objects using the uri type may restrict the schemes that
+      they permit.  For example, 'data:' and 'urn:' schemes
+      might not be appropriate.
+      A zero-length URI is not a valid URI.  This can be used to
+      express 'URI absent' where required.
+      In the value set and its semantics, this type is equivalent
+      to the Uri SMIv2 textual convention defined in RFC 5017.";
+    reference
+     "RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+      RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
+                Group: Uniform Resource Identifiers (URIs), URLs,
+                and Uniform Resource Names (URNs): Clarifications
+                and Recommendations
+      RFC 5017: MIB Textual Conventions for Uniform Resource
+                Identifiers (URIs)";
+  }
+}
diff --git a/yang/ietf-interfaces.yang b/yang/ietf-interfaces.yang
new file mode 100644
index 0000000000000000000000000000000000000000..a84d2c232edff71c21428461b4bb0b578d78bb2f
--- /dev/null
+++ b/yang/ietf-interfaces.yang
@@ -0,0 +1,602 @@
+module ietf-interfaces {
+  namespace "urn:ietf:params:xml:ns:yang:ietf-interfaces";
+  prefix if;
+  import ietf-yang-types {
+    prefix yang;
+  }
+  organization
+    "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+  contact
+    "WG Web:   <http://tools.ietf.org/wg/netmod/>
+     WG List:  <mailto:netmod@ietf.org>
+     WG Chair: Thomas Nadeau
+               <mailto:tnadeau@lucidvision.com>
+     WG Chair: Juergen Schoenwaelder
+               <mailto:j.schoenwaelder@jacobs-university.de>
+     Editor:   Martin Bjorklund
+               <mailto:mbj@tail-f.com>";
+  description
+    "This module contains a collection of YANG definitions for
+     managing network interfaces.
+     Copyright (c) 2014 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Simplified BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (http://trustee.ietf.org/license-info).
+     This version of this YANG module is part of RFC 7223; see
+     the RFC itself for full legal notices.";
+  revision 2014-05-08 {
+    description
+      "Initial revision.";
+    reference
+      "RFC 7223: A YANG Data Model for Interface Management";
+  }
+  /*
+   * Typedefs
+   */
+  typedef interface-ref {
+    type leafref {
+      path "/if:interfaces/if:interface/if:name";
+    }
+    description
+      "This type is used by data models that need to reference
+       configured interfaces.";
+  }
+  typedef interface-state-ref {
+    type leafref {
+      path "/if:interfaces-state/if:interface/if:name";
+    }
+    description
+      "This type is used by data models that need to reference
+       the operationally present interfaces.";
+  }
+  /*
+   * Identities
+   */
+  identity interface-type {
+    description
+      "Base identity from which specific interface types are
+       derived.";
+  }
+  /*
+   * Features
+   */
+  feature arbitrary-names {
+    description
+      "This feature indicates that the device allows user-controlled
+       interfaces to be named arbitrarily.";
+  }
+  feature pre-provisioning {
+    description
+      "This feature indicates that the device supports
+       pre-provisioning of interface configuration, i.e., it is
+       possible to configure an interface whose physical interface
+       hardware is not present on the device.";
+  }
+  feature if-mib {
+    description
+      "This feature indicates that the device implements
+       the IF-MIB.";
+    reference
+      "RFC 2863: The Interfaces Group MIB";
+  }
+  /*
+   * Configuration data nodes
+   */
+  container interfaces {
+    description
+      "Interface configuration parameters.";
+    list interface {
+      key "name";
+      description
+        "The list of configured interfaces on the device.
+         The operational state of an interface is available in the
+         /interfaces-state/interface list.  If the configuration of a
+         system-controlled interface cannot be used by the system
+         (e.g., the interface hardware present does not match the
+         interface type), then the configuration is not applied to
+         the system-controlled interface shown in the
+         /interfaces-state/interface list.  If the configuration
+         of a user-controlled interface cannot be used by the system,
+         the configured interface is not instantiated in the
+         /interfaces-state/interface list.";
+     leaf name {
+        type string;
+        description
+          "The name of the interface.
+           A device MAY restrict the allowed values for this leaf,
+           possibly depending on the type of the interface.
+           For system-controlled interfaces, this leaf is the
+           device-specific name of the interface.  The 'config false'
+           list /interfaces-state/interface contains the currently
+           existing interfaces on the device.
+           If a client tries to create configuration for a
+           system-controlled interface that is not present in the
+           /interfaces-state/interface list, the server MAY reject
+           the request if the implementation does not support
+           pre-provisioning of interfaces or if the name refers to
+           an interface that can never exist in the system.  A
+           NETCONF server MUST reply with an rpc-error with the
+           error-tag 'invalid-value' in this case.
+           If the device supports pre-provisioning of interface
+           configuration, the 'pre-provisioning' feature is
+           advertised.
+           If the device allows arbitrarily named user-controlled
+           interfaces, the 'arbitrary-names' feature is advertised.
+           When a configured user-controlled interface is created by
+           the system, it is instantiated with the same name in the
+           /interface-state/interface list.";
+      }
+      leaf description {
+        type string;
+        description
+          "A textual description of the interface.
+           A server implementation MAY map this leaf to the ifAlias
+           MIB object.  Such an implementation needs to use some
+           mechanism to handle the differences in size and characters
+           allowed between this leaf and ifAlias.  The definition of
+           such a mechanism is outside the scope of this document.
+           Since ifAlias is defined to be stored in non-volatile
+           storage, the MIB implementation MUST map ifAlias to the
+           value of 'description' in the persistently stored
+           datastore.
+           Specifically, if the device supports ':startup', when
+           ifAlias is read the device MUST return the value of
+           'description' in the 'startup' datastore, and when it is
+           written, it MUST be written to the 'running' and 'startup'
+           datastores.  Note that it is up to the implementation to
+           decide whether to modify this single leaf in 'startup' or
+           perform an implicit copy-config from 'running' to
+           'startup'.
+           If the device does not support ':startup', ifAlias MUST
+           be mapped to the 'description' leaf in the 'running'
+           datastore.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifAlias";
+      }
+      leaf type {
+        type identityref {
+          base interface-type;
+        }
+        mandatory true;
+        description
+          "The type of the interface.
+           When an interface entry is created, a server MAY
+           initialize the type leaf with a valid value, e.g., if it
+           is possible to derive the type from the name of the
+           interface.
+           If a client tries to set the type of an interface to a
+           value that can never be used by the system, e.g., if the
+           type is not supported or if the type does not match the
+           name of the interface, the server MUST reject the request.
+           A NETCONF server MUST reply with an rpc-error with the
+           error-tag 'invalid-value' in this case.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifType";
+      }
+      leaf enabled {
+        type boolean;
+        default "true";
+        description
+          "This leaf contains the configured, desired state of the
+           interface.
+           Systems that implement the IF-MIB use the value of this
+           leaf in the 'running' datastore to set
+           IF-MIB.ifAdminStatus to 'up' or 'down' after an ifEntry
+           has been initialized, as described in RFC 2863.
+           Changes in this leaf in the 'running' datastore are
+           reflected in ifAdminStatus, but if ifAdminStatus is
+           changed over SNMP, this leaf is not affected.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
+      }
+      leaf link-up-down-trap-enable {
+        if-feature if-mib;
+        type enumeration {
+          enum enabled {
+            value 1;
+          }
+          enum disabled {
+            value 2;
+          }
+        }
+        description
+          "Controls whether linkUp/linkDown SNMP notifications
+           should be generated for this interface.
+           If this node is not configured, the value 'enabled' is
+           operationally used by the server for interfaces that do
+           not operate on top of any other interface (i.e., there are
+           no 'lower-layer-if' entries), and 'disabled' otherwise.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifLinkUpDownTrapEnable";
+      }
+    }
+  }
+  /*
+   * Operational state data nodes
+   */
+  container interfaces-state {
+    config false;
+    description
+      "Data nodes for the operational state of interfaces.";
+    list interface {
+      key "name";
+      description
+        "The list of interfaces on the device.
+         System-controlled interfaces created by the system are
+         always present in this list, whether they are configured or
+         not.";
+      leaf name {
+        type string;
+        description
+          "The name of the interface.
+           A server implementation MAY map this leaf to the ifName
+           MIB object.  Such an implementation needs to use some
+           mechanism to handle the differences in size and characters
+           allowed between this leaf and ifName.  The definition of
+           such a mechanism is outside the scope of this document.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifName";
+      }
+      leaf type {
+        type identityref {
+          base interface-type;
+        }
+        mandatory true;
+        description
+          "The type of the interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifType";
+      }
+      leaf admin-status {
+        if-feature if-mib;
+        type enumeration {
+          enum up {
+            value 1;
+            description
+              "Ready to pass packets.";
+          }
+          enum down {
+            value 2;
+            description
+              "Not ready to pass packets and not in some test mode.";
+          }
+          enum testing {
+            value 3;
+            description
+              "In some test mode.";
+          }
+        }
+        mandatory true;
+        description
+          "The desired state of the interface.
+           This leaf has the same read semantics as ifAdminStatus.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
+      }
+      leaf oper-status {
+        type enumeration {
+          enum up {
+            value 1;
+            description
+              "Ready to pass packets.";
+          }
+          enum down {
+            value 2;
+            description
+              "The interface does not pass any packets.";
+          }
+          enum testing {
+            value 3;
+            description
+              "In some test mode.  No operational packets can
+               be passed.";
+          }
+          enum unknown {
+            value 4;
+            description
+              "Status cannot be determined for some reason.";
+          }
+          enum dormant {
+            value 5;
+            description
+              "Waiting for some external event.";
+          }
+          enum not-present {
+            value 6;
+            description
+              "Some component (typically hardware) is missing.";
+          }
+          enum lower-layer-down {
+            value 7;
+            description
+              "Down due to state of lower-layer interface(s).";
+          }
+        }
+        mandatory true;
+        description
+          "The current operational state of the interface.
+           This leaf has the same semantics as ifOperStatus.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifOperStatus";
+      }
+      leaf last-change {
+        type yang:date-and-time;
+        description
+          "The time the interface entered its current operational
+           state.  If the current state was entered prior to the
+           last re-initialization of the local network management
+           subsystem, then this node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifLastChange";
+      }
+      leaf if-index {
+        if-feature if-mib;
+        type int32 {
+          range "1..2147483647";
+        }
+        mandatory true;
+        description
+          "The ifIndex value for the ifEntry represented by this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifIndex";
+      }
+      leaf phys-address {
+        type yang:phys-address;
+        description
+          "The interface's address at its protocol sub-layer.  For
+           example, for an 802.x interface, this object normally
+           contains a Media Access Control (MAC) address.  The
+           interface's media-specific modules must define the bit
+           and byte ordering and the format of the value of this
+           object.  For interfaces that do not have such an address
+           (e.g., a serial line), this node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifPhysAddress";
+      }
+      leaf-list higher-layer-if {
+        type interface-state-ref;
+        description
+          "A list of references to interfaces layered on top of this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifStackTable";
+      }
+      leaf-list lower-layer-if {
+        type interface-state-ref;
+        description
+          "A list of references to interfaces layered underneath this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifStackTable";
+      }
+      leaf speed {
+        type yang:gauge64;
+        units "bits/second";
+        description
+            "An estimate of the interface's current bandwidth in bits
+             per second.  For interfaces that do not vary in
+             bandwidth or for those where no accurate estimation can
+             be made, this node should contain the nominal bandwidth.
+             For interfaces that have no concept of bandwidth, this
+             node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifSpeed, ifHighSpeed";
+      }
+      container statistics {
+        description
+          "A collection of interface-related statistics objects.";
+        leaf discontinuity-time {
+          type yang:date-and-time;
+          mandatory true;
+          description
+            "The time on the most recent occasion at which any one or
+             more of this interface's counters suffered a
+             discontinuity.  If no such discontinuities have occurred
+             since the last re-initialization of the local management
+             subsystem, then this node contains the time the local
+             management subsystem re-initialized itself.";
+        }
+        leaf in-octets {
+          type yang:counter64;
+          description
+            "The total number of octets received on the interface,
+             including framing characters.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCInOctets";
+        }
+        leaf in-unicast-pkts {
+          type yang:counter64;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were not addressed to a
+             multicast or broadcast address at this sub-layer.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCInUcastPkts";
+        }
+        leaf in-broadcast-pkts {
+          type yang:counter64;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were addressed to a broadcast
+             address at this sub-layer.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCInBroadcastPkts";
+        }
+        leaf in-multicast-pkts {
+          type yang:counter64;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were addressed to a multicast
+             address at this sub-layer.  For a MAC-layer protocol,
+             this includes both Group and Functional addresses.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCInMulticastPkts";
+        }
+        leaf in-discards {
+          type yang:counter32;
+          description
+            "The number of inbound packets that were chosen to be
+             discarded even though no errors had been detected to
+             prevent their being deliverable to a higher-layer
+             protocol.  One possible reason for discarding such a
+             packet could be to free up buffer space.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInDiscards";
+        }
+        leaf in-errors {
+          type yang:counter32;
+          description
+            "For packet-oriented interfaces, the number of inbound
+             packets that contained errors preventing them from being
+             deliverable to a higher-layer protocol.  For character-
+             oriented or fixed-length interfaces, the number of
+             inbound transmission units that contained errors
+             preventing them from being deliverable to a higher-layer
+             protocol.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInErrors";
+        }
+        leaf in-unknown-protos {
+          type yang:counter32;
+          description
+            "For packet-oriented interfaces, the number of packets
+             received via the interface that were discarded because
+             of an unknown or unsupported protocol.  For
+             character-oriented or fixed-length interfaces that
+             support protocol multiplexing, the number of
+             transmission units received via the interface that were
+             discarded because of an unknown or unsupported protocol.
+             For any interface that does not support protocol
+             multiplexing, this counter is not present.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInUnknownProtos";
+        }
+        leaf out-octets {
+          type yang:counter64;
+          description
+            "The total number of octets transmitted out of the
+             interface, including framing characters.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCOutOctets";
+        }
+        leaf out-unicast-pkts {
+          type yang:counter64;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted, and that were not addressed
+             to a multicast or broadcast address at this sub-layer,
+             including those that were discarded or not sent.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCOutUcastPkts";
+        }
+        leaf out-broadcast-pkts {
+          type yang:counter64;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted, and that were addressed to a
+             broadcast address at this sub-layer, including those
+             that were discarded or not sent.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCOutBroadcastPkts";
+        }
+        leaf out-multicast-pkts {
+          type yang:counter64;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted, and that were addressed to a
+             multicast address at this sub-layer, including those
+             that were discarded or not sent.  For a MAC-layer
+             protocol, this includes both Group and Functional
+             addresses.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCOutMulticastPkts";
+        }
+        leaf out-discards {
+          type yang:counter32;
+          description
+            "The number of outbound packets that were chosen to be
+             discarded even though no errors had been detected to
+             prevent their being transmitted.  One possible reason
+             for discarding such a packet could be to free up buffer
+             space.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifOutDiscards";
+        }
+        leaf out-errors {
+          type yang:counter32;
+          description
+            "For packet-oriented interfaces, the number of outbound
+             packets that could not be transmitted because of errors.
+             For character-oriented or fixed-length interfaces, the
+             number of outbound transmission units that could not be
+             transmitted because of errors.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system, and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifOutErrors";
+        }
+      }
+    }
+  }
+}
diff --git a/yang/ietf-yang-types.yang b/yang/ietf-yang-types.yang
new file mode 100644
index 0000000000000000000000000000000000000000..2a914e6f7daa9a26b38f95760fc12a7e1ac3e65b
--- /dev/null
+++ b/yang/ietf-yang-types.yang
@@ -0,0 +1,404 @@
+module ietf-yang-types {
+  namespace "urn:ietf:params:xml:ns:yang:ietf-yang-types";
+  prefix "yang";
+  organization
+   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+  contact
+   "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+  description
+   "This module contains a collection of generally useful derived
+    YANG data types.
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+  revision 2013-07-15 {
+    description
+     "This revision adds the following new data types:
+      - yang-identifier
+      - hex-string
+      - uuid
+      - dotted-quad";
+    reference
+     "RFC 6991: Common YANG Data Types";
+  }
+  revision 2010-09-24 {
+    description
+     "Initial revision.";
+    reference
+     "RFC 6021: Common YANG Data Types";
+  }
+  /*** collection of counter and gauge types ***/
+  typedef counter32 {
+    type uint32;
+    description
+     "The counter32 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter32 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+      The counter32 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter32.
+      In the value set and its semantics, this type is equivalent
+      to the Counter32 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+  typedef zero-based-counter32 {
+    type yang:counter32;
+    default "0";
+    description
+     "The zero-based-counter32 type represents a counter32
+      that has the defined 'initial' value zero.
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter32 textual convention of the SMIv2.";
+    reference
+      "RFC 4502: Remote Network Monitoring Management Information
+                 Base Version 2";
+  }
+  typedef counter64 {
+    type uint64;
+    description
+     "The counter64 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter64 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+      The counter64 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter64.
+      In the value set and its semantics, this type is equivalent
+      to the Counter64 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+  typedef zero-based-counter64 {
+    type yang:counter64;
+    default "0";
+    description
+     "The zero-based-counter64 type represents a counter64 that
+      has the defined 'initial' value zero.
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter64 textual convention of the SMIv2.";
+    reference
+     "RFC 2856: Textual Conventions for Additional High Capacity
+                Data Types";
+  }
+  typedef gauge32 {
+    type uint32;
+    description
+     "The gauge32 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^32-1 (4294967295 decimal), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge32 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge32 also decreases (increases).
+      In the value set and its semantics, this type is equivalent
+      to the Gauge32 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+  typedef gauge64 {
+    type uint64;
+    description
+     "The gauge64 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^64-1 (18446744073709551615), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge64 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge64 also decreases (increases).
+      In the value set and its semantics, this type is equivalent
+      to the CounterBasedGauge64 SMIv2 textual convention defined
+      in RFC 2856";
+    reference
+     "RFC 2856: Textual Conventions for Additional High Capacity
+                Data Types";
+  }
+  /*** collection of identifier-related types ***/
+  typedef object-identifier {
+    type string {
+      pattern '(([0-1](\.[1-3]?[0-9]))|(2\.(0|([1-9]\d*))))'
+            + '(\.(0|([1-9]\d*)))*';
+    }
+    description
+     "The object-identifier type represents administratively
+      assigned names in a registration-hierarchical-name tree.
+      Values of this type are denoted as a sequence of numerical
+      non-negative sub-identifier values.  Each sub-identifier
+      value MUST NOT exceed 2^32-1 (4294967295).  Sub-identifiers
+      are separated by single dots and without any intermediate
+      whitespace.
+      The ASN.1 standard restricts the value space of the first
+      sub-identifier to 0, 1, or 2.  Furthermore, the value space
+      of the second sub-identifier is restricted to the range
+      0 to 39 if the first sub-identifier is 0 or 1.  Finally,
+      the ASN.1 standard requires that an object identifier
+      has always at least two sub-identifiers.  The pattern
+      captures these restrictions.
+      Although the number of sub-identifiers is not limited,
+      module designers should realize that there may be
+      implementations that stick with the SMIv2 limit of 128
+      sub-identifiers.
+      This type is a superset of the SMIv2 OBJECT IDENTIFIER type
+      since it is not restricted to 128 sub-identifiers.  Hence,
+      this type SHOULD NOT be used to represent the SMIv2 OBJECT
+      IDENTIFIER type; the object-identifier-128 type SHOULD be
+      used instead.";
+    reference
+     "ISO9834-1: Information technology -- Open Systems
+      Interconnection -- Procedures for the operation of OSI
+      Registration Authorities: General procedures and top
+      arcs of the ASN.1 Object Identifier tree";
+  }
+  typedef object-identifier-128 {
+    type object-identifier {
+      pattern '\d*(\.\d*){1,127}';
+    }
+    description
+     "This type represents object-identifiers restricted to 128
+      sub-identifiers.
+      In the value set and its semantics, this type is equivalent
+      to the OBJECT IDENTIFIER type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+  typedef yang-identifier {
+    type string {
+      length "1..max";
+      pattern '[a-zA-Z_][a-zA-Z0-9\-_.]*';
+      pattern '.|..|[^xX].*|.[^mM].*|..[^lL].*';
+    }
+    description
+      "A YANG identifier string as defined by the 'identifier'
+       rule in Section 12 of RFC 6020.  An identifier must
+       start with an alphabetic character or an underscore
+       followed by an arbitrary sequence of alphabetic or
+       numeric characters, underscores, hyphens, or dots.
+       A YANG identifier MUST NOT start with any possible
+       combination of the lowercase or uppercase character
+       sequence 'xml'.";
+    reference
+      "RFC 6020: YANG - A Data Modeling Language for the Network
+                 Configuration Protocol (NETCONF)";
+  }
+  /*** collection of types related to date and time***/
+  typedef date-and-time {
+    type string {
+      pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?'
+            + '(Z|[\+\-]\d{2}:\d{2})';
+    }
+    description
+     "The date-and-time type is a profile of the ISO 8601
+      standard for representation of dates and times using the
+      Gregorian calendar.  The profile is defined by the
+      date-time production in Section 5.6 of RFC 3339.
+      The date-and-time type is compatible with the dateTime XML
+      schema type with the following notable exceptions:
+      (a) The date-and-time type does not allow negative years.
+      (b) The date-and-time time-offset -00:00 indicates an unknown
+          time zone (see RFC 3339) while -00:00 and +00:00 and Z
+          all represent the same time zone in dateTime.
+      (c) The canonical format (see below) of data-and-time values
+          differs from the canonical format used by the dateTime XML
+          schema type, which requires all times to be in UTC using
+          the time-offset 'Z'.
+      This type is not equivalent to the DateAndTime textual
+      convention of the SMIv2 since RFC 3339 uses a different
+      separator between full-date and full-time and provides
+      higher resolution of time-secfrac.
+      The canonical format for date-and-time values with a known time
+      zone uses a numeric time zone offset that is calculated using
+      the device's configured known offset to UTC time.  A change of
+      the device's offset to UTC time will cause date-and-time values
+      to change accordingly.  Such changes might happen periodically
+      in case a server follows automatically daylight saving time
+      (DST) time zone offset changes.  The canonical format for
+      date-and-time values with an unknown time zone (usually
+      referring to the notion of local time) uses the time-offset
+      -00:00.";
+    reference
+     "RFC 3339: Date and Time on the Internet: Timestamps
+      RFC 2579: Textual Conventions for SMIv2
+      XSD-TYPES: XML Schema Part 2: Datatypes Second Edition";
+  }
+  typedef timeticks {
+    type uint32;
+    description
+     "The timeticks type represents a non-negative integer that
+      represents the time, modulo 2^32 (4294967296 decimal), in
+      hundredths of a second between two epochs.  When a schema
+      node is defined that uses this type, the description of
+      the schema node identifies both of the reference epochs.
+      In the value set and its semantics, this type is equivalent
+      to the TimeTicks type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+  typedef timestamp {
+    type yang:timeticks;
+    description
+     "The timestamp type represents the value of an associated
+      timeticks schema node at which a specific occurrence
+      happened.  The specific occurrence must be defined in the
+      description of any schema node defined using this type.  When
+      the specific occurrence occurred prior to the last time the
+      associated timeticks attribute was zero, then the timestamp
+      value is zero.  Note that this requires all timestamp values
+      to be reset to zero when the value of the associated timeticks
+      attribute reaches 497+ days and wraps around to zero.
+      The associated timeticks schema node must be specified
+      in the description of any schema node using this type.
+      In the value set and its semantics, this type is equivalent
+      to the TimeStamp textual convention of the SMIv2.";
+    reference
+     "RFC 2579: Textual Conventions for SMIv2";
+  }
+  /*** collection of generic address types ***/
+  typedef phys-address {
+    type string {
+      pattern '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+    }
+    description
+     "Represents media- or physical-level addresses represented
+      as a sequence octets, each octet represented by two hexadecimal
+      numbers.  Octets are separated by colons.  The canonical
+      representation uses lowercase characters.
+      In the value set and its semantics, this type is equivalent
+      to the PhysAddress textual convention of the SMIv2.";
+    reference
+     "RFC 2579: Textual Conventions for SMIv2";
+  }
+  typedef mac-address {
+    type string {
+      pattern '[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}';
+    }
+    description
+     "The mac-address type represents an IEEE 802 MAC address.
+      The canonical representation uses lowercase characters.
+      In the value set and its semantics, this type is equivalent
+      to the MacAddress textual convention of the SMIv2.";
+    reference
+     "IEEE 802: IEEE Standard for Local and Metropolitan Area
+                Networks: Overview and Architecture
+      RFC 2579: Textual Conventions for SMIv2";
+  }
+  /*** collection of XML-specific types ***/
+  typedef xpath1.0 {
+    type string;
+    description
+     "This type represents an XPATH 1.0 expression.
+      When a schema node is defined that uses this type, the
+      description of the schema node MUST specify the XPath
+      context in which the XPath expression is evaluated.";
+    reference
+     "XPATH: XML Path Language (XPath) Version 1.0";
+  }
+  /*** collection of string types ***/
+  typedef hex-string {
+    type string {
+      pattern '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+    }
+    description
+     "A hexadecimal string with octets represented as hex digits
+      separated by colons.  The canonical representation uses
+      lowercase characters.";
+  }
+  typedef uuid {
+    type string {
+      pattern '[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-'
+            + '[0-9a-fA-F]{4}-[0-9a-fA-F]{12}';
+    }
+    description
+     "A Universally Unique IDentifier in the string representation
+      defined in RFC 4122.  The canonical representation uses
+      lowercase characters.
+      The following is an example of a UUID in string representation:
+      f81d4fae-7dec-11d0-a765-00a0c91e6bf6
+      ";
+    reference
+     "RFC 4122: A Universally Unique IDentifier (UUID) URN
+                Namespace";
+  }
+  typedef dotted-quad {
+    type string {
+      pattern
+        '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+      + '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])';
+    }
+    description
+      "An unsigned 32-bit number expressed in the dotted-quad
+       notation, i.e., four octets written as decimal numbers
+       and separated with the '.' (full stop) character.";
+  }
+}
diff --git a/yang/openconfig-extensions.yang b/yang/openconfig-extensions.yang
new file mode 100644
index 0000000000000000000000000000000000000000..179b9ea91b7522752eaf82559643b78b73117aa1
--- /dev/null
+++ b/yang/openconfig-extensions.yang
@@ -0,0 +1,89 @@
+module openconfig-extensions {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/openconfig-ext";
+
+  prefix "oc-ext";
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    www.openconfig.net";
+
+  description
+    "This module provides extensions to the YANG language to allow
+    OpenConfig specific functionality and meta-data to be defined.";
+
+  revision "2017-01-29" {
+    description
+      "Added extension for annotating encrypted values.";
+    reference "TBD";
+  }
+
+  revision "2015-10-09" {
+    description
+      "Initial OpenConfig public release";
+    reference "TBD";
+  }
+
+  revision "2015-10-05" {
+    description
+      "Initial revision";
+    reference "TBD";
+  }
+
+  // extension statements
+  extension openconfig-version {
+    argument "semver" {
+      yin-element false;
+    }
+    description
+      "The OpenConfig version number for the module. This is
+      expressed as a semantic version number of the form:
+        x.y.z
+      where:
+        * x corresponds to the major version,
+        * y corresponds to a minor version,
+        * z corresponds to a patch version.
+      This version corresponds to the model file within which it is
+      defined, and does not cover the whole set of OpenConfig models.
+      Where several modules are used to build up a single block of
+      functionality, the same module version is specified across each
+      file that makes up the module.
+
+      A major version number of 0 indicates that this model is still
+      in development (whether within OpenConfig or with industry
+      partners), and is potentially subject to change.
+
+      Following a release of major version 1, all modules will
+      increment major revision number where backwards incompatible
+      changes to the model are made.
+
+      The minor version is changed when features are added to the
+      model that do not impact current clients use of the model.
+
+      The patch-level version is incremented when non-feature changes
+      (such as bugfixes or clarifications to human-readable
+      descriptions that do not impact model functionality) are made
+      that maintain backwards compatibility.
+
+      The version number is stored in the module meta-data.";
+  }
+
+  extension openconfig-encrypted-value {
+    description
+      "This extension provides an annotation on schema nodes to
+      indicate that the corresponding value should be stored and
+      reported in encrypted form.
+
+      Clients reading the configuration or applied configuration
+      for the node should expect to receive only the encrypted value.
+      This annotation may be used on nodes such as secure passwords
+      in which the device never reports a cleartext value, even
+      if the input is provided as cleartext.";
+  }
+}
\ No newline at end of file
diff --git a/yang/openconfig-if-aggregate.yang b/yang/openconfig-if-aggregate.yang
new file mode 100644
index 0000000000000000000000000000000000000000..0fd5b3ffe60100e7123f99bdc8845d5cead896d7
--- /dev/null
+++ b/yang/openconfig-if-aggregate.yang
@@ -0,0 +1,192 @@
+module openconfig-if-aggregate {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/interfaces/aggregate";
+
+  prefix "oc-lag";
+
+  // import some basic types
+  import openconfig-interfaces { prefix oc-if; }
+  import openconfig-if-ethernet { prefix oc-eth; }
+  import iana-if-type { prefix ift; }
+  import openconfig-extensions { prefix oc-ext; }
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    netopenconfig@googlegroups.com";
+
+  description
+    "Model for managing aggregated (aka bundle, LAG) interfaces.";
+
+  oc-ext:openconfig-version "1.1.0";
+
+  revision "2016-12-22" {
+    description
+      "Fixes to Ethernet interfaces model";
+    reference "1.1.0";
+  }
+
+  // extension statements
+
+  // feature statements
+
+  // identity statements
+
+  // typedef statements
+
+
+
+  typedef aggregation-type {
+    type enumeration {
+      enum LACP {
+        description "LAG managed by LACP";
+      }
+      enum STATIC {
+        description "Statically configured bundle / LAG";
+      }
+    }
+    description
+      "Type to define the lag-type, i.e., how the LAG is
+      defined and managed";
+  }
+
+  // grouping statements
+
+
+  grouping aggregation-logical-config {
+    description
+      "Configuration data for aggregate interfaces";
+
+
+    leaf lag-type {
+      type aggregation-type;
+      description
+        "Sets the type of LAG, i.e., how it is
+        configured / maintained";
+    }
+
+    leaf min-links {
+      type uint16;
+      description
+        "Specifies the mininum number of member
+        interfaces that must be active for the aggregate interface
+        to be available";
+    }
+  }
+
+  grouping aggregation-logical-state {
+    description
+      "Operational state data for aggregate interfaces";
+
+    leaf lag-speed {
+      type uint32;
+      units Mbps;
+      description
+        "Reports effective speed of the aggregate interface,
+        based on speed of active member interfaces";
+    }
+
+    leaf-list member {
+      when "oc-lag:lag-type = 'STATIC'" {
+        description
+          "The simple list of member interfaces is active
+          when the aggregate is statically configured";
+      }
+      type oc-if:base-interface-ref;
+      description
+        "List of current member interfaces for the aggregate,
+        expressed as references to existing interfaces";
+    }
+  }
+
+  grouping aggregation-logical-top {
+    description "Top-level data definitions for LAGs";
+
+    container aggregation {
+
+      description
+        "Options for logical interfaces representing
+        aggregates";
+
+      container config {
+        description
+          "Configuration variables for logical aggregate /
+          LAG interfaces";
+
+        uses aggregation-logical-config;
+      }
+
+      container state {
+
+        config false;
+        description
+          "Operational state variables for logical
+          aggregate / LAG interfaces";
+
+        uses aggregation-logical-config;
+        uses aggregation-logical-state;
+
+      }
+    }
+  }
+
+  grouping ethernet-if-aggregation-config {
+    description
+      "Adds configuration items for Ethernet interfaces
+      belonging to a logical aggregate / LAG";
+
+    leaf aggregate-id {
+      type leafref {
+        path "/oc-if:interfaces/oc-if:interface/oc-if:name";
+      }
+      description
+        "Specify the logical aggregate interface to which
+        this interface belongs";
+    }
+  }
+
+  // data definition statements
+
+  // augment statements
+
+  augment "/oc-if:interfaces/oc-if:interface" {
+    when "oc-if:type = 'ift:ieee8023adLag'" {
+      description "active when the interface is set to type LAG";
+    }
+    description "Adds LAG configuration to the interface module";
+
+    uses aggregation-logical-top;
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-eth:ethernet/" +
+    "oc-eth:config" {
+    when "oc-if:type = 'ift:ethernetCsmacd'" {
+      description "active when the interface is Ethernet";
+    }
+    description "Adds LAG settings to individual Ethernet
+    interfaces";
+
+    uses ethernet-if-aggregation-config;
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-eth:ethernet/" +
+    "oc-eth:state" {
+    when "oc-if:type = 'ift:ethernetCsmacd'" {
+      description "active when the interface is Ethernet";
+    }
+    description "Adds LAG settings to individual Ethernet
+    interfaces";
+
+    uses ethernet-if-aggregation-config;
+  }
+
+  // rpc statements
+
+  // notification statements
+
+}
diff --git a/yang/openconfig-if-ethernet.yang b/yang/openconfig-if-ethernet.yang
new file mode 100644
index 0000000000000000000000000000000000000000..9d26e9d7b88e1d683a5b7d1877645143d1eb7209
--- /dev/null
+++ b/yang/openconfig-if-ethernet.yang
@@ -0,0 +1,345 @@
+module openconfig-if-ethernet {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/interfaces/ethernet";
+
+  prefix "oc-eth";
+
+  // import some basic types
+  import openconfig-interfaces { prefix oc-if; }
+  import iana-if-type { prefix ift; }
+  import ietf-yang-types { prefix yang; }
+  import openconfig-extensions { prefix oc-ext; }
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    netopenconfig@googlegroups.com";
+
+  description
+    "Model for managing Ethernet interfaces -- augments the IETF YANG
+    model for interfaces described by RFC 7223";
+
+  oc-ext:openconfig-version "1.1.0";
+
+  revision "2016-12-22" {
+    description
+      "Fixes to Ethernet interfaces model";
+    reference "1.1.0";
+  }
+
+  // extension statements
+
+  // feature statements
+
+  // identity statements
+
+  identity ETHERNET_SPEED {
+    description "base type to specify available Ethernet link
+    speeds";
+  }
+
+  identity SPEED_10MB {
+    base ETHERNET_SPEED;
+    description "10 Mbps Ethernet";
+  }
+
+  identity SPEED_100MB {
+    base ETHERNET_SPEED;
+    description "100 Mbps Ethernet";
+  }
+
+  identity SPEED_1GB {
+    base ETHERNET_SPEED;
+    description "1 GBps Ethernet";
+  }
+
+  identity SPEED_10GB {
+    base ETHERNET_SPEED;
+    description "10 GBps Ethernet";
+  }
+
+  identity SPEED_25GB {
+    base ETHERNET_SPEED;
+    description "25 GBps Ethernet";
+  }
+
+  identity SPEED_40GB {
+    base ETHERNET_SPEED;
+    description "40 GBps Ethernet";
+  }
+
+  identity SPEED_50GB {
+    base ETHERNET_SPEED;
+    description "50 GBps Ethernet";
+  }
+
+  identity SPEED_100GB {
+    base ETHERNET_SPEED;
+    description "100 GBps Ethernet";
+  }
+
+  identity SPEED_UNKNOWN {
+    base ETHERNET_SPEED;
+    description
+      "Interface speed is unknown.  Systems may report
+      speed UNKNOWN when an interface is down or unpopuplated (e.g.,
+      pluggable not present).";
+  }
+
+  // typedef statements
+
+
+  // grouping statements
+
+  grouping ethernet-interface-config {
+    description "Configuration items for Ethernet interfaces";
+
+    leaf mac-address {
+      type yang:mac-address;
+      description
+        "Assigns a MAC address to the Ethernet interface.  If not
+        specified, the corresponding operational state leaf is
+        expected to show the system-assigned MAC address.";
+    }
+
+    leaf auto-negotiate {
+      type boolean;
+      default true;
+      description
+        "Set to TRUE to request the interface to auto-negotiate
+        transmission parameters with its peer interface.  When
+        set to FALSE, the transmission parameters are specified
+        manually.";
+      reference
+        "IEEE 802.3-2012 auto-negotiation transmission parameters";
+    }
+
+    leaf duplex-mode {
+      type enumeration {
+        enum FULL {
+          description "Full duplex mode";
+        }
+        enum HALF {
+          description "Half duplex mode";
+        }
+      }
+      description
+        "When auto-negotiate is TRUE, this optionally sets the
+        duplex mode that will be advertised to the peer.  If
+        unspecified, the interface should negotiate the duplex mode
+        directly (typically full-duplex).  When auto-negotiate is
+        FALSE, this sets the duplex mode on the interface directly.";
+    }
+
+    leaf port-speed {
+      type identityref {
+        base ETHERNET_SPEED;
+      }
+      description
+        "When auto-negotiate is TRUE, this optionally sets the
+        port-speed mode that will be advertised to the peer for
+        negotiation.  If unspecified, it is expected that the
+        interface will select the highest speed available based on
+        negotiation.  When auto-negotiate is set to FALSE, sets the
+        link speed to a fixed value -- supported values are defined
+        by ETHERNET_SPEED identities";
+    }
+
+    leaf enable-flow-control {
+      type boolean;
+      default false;
+      description
+        "Enable or disable flow control for this interface.
+        Ethernet flow control is a mechanism by which a receiver
+        may send PAUSE frames to a sender to stop transmission for
+        a specified time.
+
+        This setting should override auto-negotiated flow control
+        settings.  If left unspecified, and auto-negotiate is TRUE,
+        flow control mode is negotiated with the peer interface.";
+      reference
+        "IEEE 802.3x";
+    }
+  }
+
+  grouping ethernet-interface-state-counters {
+    description
+      "Ethernet-specific counters and statistics";
+
+    // ingress counters
+
+    leaf in-mac-control-frames {
+      type yang:counter64;
+      description
+        "MAC layer control frames received on the interface";
+    }
+
+    leaf in-mac-pause-frames {
+      type yang:counter64;
+      description
+        "MAC layer PAUSE frames received on the interface";
+    }
+
+    leaf in-oversize-frames {
+      type yang:counter64;
+      description
+        "Number of oversize frames received on the interface";
+    }
+
+    leaf in-jabber-frames {
+      type yang:counter64;
+      description
+        "Number of jabber frames received on the
+        interface.  Jabber frames are typically defined as oversize
+        frames which also have a bad CRC.  Implementations may use
+        slightly different definitions of what constitutes a jabber
+        frame.  Often indicative of a NIC hardware problem.";
+    }
+
+    leaf in-fragment-frames {
+      type yang:counter64;
+      description
+        "Number of fragment frames received on the interface.";
+    }
+
+    leaf in-8021q-frames {
+      type yang:counter64;
+      description
+        "Number of 802.1q tagged frames received on the interface";
+    }
+
+    leaf in-crc-errors {
+      type yang:counter64;
+      description
+        "Number of receive error events due to FCS/CRC check
+        failure";
+    }
+
+    // egress counters
+
+    leaf out-mac-control-frames {
+      type yang:counter64;
+      description
+        "MAC layer control frames sent on the interface";
+    }
+
+    leaf out-mac-pause-frames {
+      type yang:counter64;
+      description
+        "MAC layer PAUSE frames sent on the interface";
+    }
+
+    leaf out-8021q-frames {
+      type yang:counter64;
+      description
+        "Number of 802.1q tagged frames sent on the interface";
+    }
+  }
+
+  grouping ethernet-interface-state {
+    description
+      "Grouping for defining Ethernet-specific operational state";
+
+    leaf hw-mac-address {
+      type yang:mac-address;
+      description
+        "Represenets the 'burned-in',  or system-assigned, MAC
+        address for the Ethernet interface.";
+    }
+
+    leaf effective-speed {
+      type uint32;
+      units Mbps;
+      description
+        "Reports the effective speed of the interface, e.g., the
+        negotiated speed if auto-negotiate is enabled";
+    }
+
+    leaf negotiated-duplex-mode {
+      type enumeration {
+        enum FULL {
+          description "Full duplex mode";
+        }
+        enum HALF {
+          description "Half duplex mode";
+        }
+      }
+      description
+        "When auto-negotiate is set to TRUE, and the interface has
+        completed auto-negotiation with the remote peer, this value
+        shows the duplex mode that has been negotiated.";
+    }
+
+    leaf negotiated-port-speed {
+      type identityref {
+        base ETHERNET_SPEED;
+      }
+      description
+        "When auto-negotiate is set to TRUE, and the interface has
+        completed auto-negotiation with the remote peer, this value
+        shows the interface speed that has been negotiated.";
+    }
+
+    container counters {
+      description "Ethernet interface counters";
+
+      uses ethernet-interface-state-counters;
+
+    }
+
+  }
+
+  // data definition statements
+
+  grouping ethernet-top {
+    description "top-level Ethernet config and state containers";
+
+    container ethernet {
+      description
+        "Top-level container for ethernet configuration
+        and state";
+
+      container config {
+        description "Configuration data for ethernet interfaces";
+
+        uses ethernet-interface-config;
+
+      }
+
+      container state {
+
+        config false;
+        description "State variables for Ethernet interfaces";
+
+        uses ethernet-interface-config;
+        uses ethernet-interface-state;
+
+      }
+
+    }
+  }
+
+  // augment statements
+
+  augment "/oc-if:interfaces/oc-if:interface" {
+    description "Adds addtional Ethernet-specific configuration to
+    interfaces model";
+
+    uses ethernet-top {
+      when "oc-if:state/oc-if:type = 'ift:ethernetCsmacd'" {
+      description "Additional interface configuration parameters when
+      the interface type is Ethernet";
+      }
+    }
+  }
+
+  // rpc statements
+
+  // notification statements
+
+}
diff --git a/yang/openconfig-if-ip-ext.yang b/yang/openconfig-if-ip-ext.yang
new file mode 100644
index 0000000000000000000000000000000000000000..06a79c7e1405eb106dcda488380ff6ef92d8b9be
--- /dev/null
+++ b/yang/openconfig-if-ip-ext.yang
@@ -0,0 +1,149 @@
+module openconfig-if-ip-ext {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/interfaces/ip-ext";
+
+  prefix "oc-ip-ext";
+
+  import openconfig-interfaces { prefix oc-if; }
+  import openconfig-if-ip { prefix oc-ip; }
+  import openconfig-extensions { prefix oc-ext; }
+
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    www.openconfig.net";
+
+  description
+    "This module adds extensions to the base IP configuration and
+    operational state model to support additional use cases.";
+
+  oc-ext:openconfig-version "1.1.0";
+
+  revision "2016-12-22" {
+    description
+      "Fixes to Ethernet interfaces model";
+    reference "1.1.0";
+  }
+
+
+  // grouping statements
+
+  grouping ipv6-autoconf-config {
+    description
+      "Configuration data for IPv6 address autoconfiguration";
+
+    leaf create-global-addresses {
+      type boolean;
+      default true;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        If enabled, the host creates global addresses as
+        described in RFC 4862.";
+      reference
+        "RFC 4862: IPv6 Stateless Address Autoconfiguration
+                  Section 5.5";
+    }
+    leaf create-temporary-addresses {
+      type boolean;
+      default false;
+      description
+      "[adapted from IETF IP model RFC 7277]
+
+      If enabled, the host creates temporary addresses as
+      described in RFC 4941.";
+      reference
+        "RFC 4941: Privacy Extensions for Stateless Address
+                  Autoconfiguration in IPv6";
+    }
+
+    leaf temporary-valid-lifetime {
+      type uint32;
+      units "seconds";
+      default 604800;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The time period during which the temporary address
+        is valid.";
+      reference
+        "RFC 4941: Privacy Extensions for Stateless Address
+                  Autoconfiguration in IPv6
+                  - TEMP_VALID_LIFETIME";
+    }
+
+    leaf temporary-preferred-lifetime {
+      type uint32;
+      units "seconds";
+      default 86400;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The time period during which the temporary address is
+        preferred.";
+      reference
+        "RFC 4941: Privacy Extensions for Stateless Address
+                  Autoconfiguration in IPv6
+                  - TEMP_PREFERRED_LIFETIME";
+    }
+  }
+
+  grouping ipv6-autoconf-state {
+    description
+      "Operational state data for IPv6 address autoconfiguration";
+
+    //TODO: placeholder for additional opstate for IPv6 autoconf
+  }
+
+  grouping ipv6-autoconf-top {
+    description
+      "Top-level grouping for IPv6 address autoconfiguration";
+
+    container autoconf {
+      description
+        "Top-level container for IPv6 autoconf";
+
+      container config {
+        description
+          "[adapted from IETF IP model RFC 7277]
+
+          Parameters to control the autoconfiguration of IPv6
+          addresses, as described in RFC 4862.";
+        reference
+          "RFC 4862: IPv6 Stateless Address Autoconfiguration";
+
+        uses ipv6-autoconf-config;
+      }
+
+      container state {
+
+        config false;
+
+        description
+          "Operational state data ";
+
+        uses ipv6-autoconf-config;
+        uses ipv6-autoconf-state;
+      }
+    }
+  }
+
+  // data definition statements
+
+  // augment statements
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+    "oc-if:subinterface/oc-ip:ipv6" {
+      description
+        "Adds address autoconfiguration to the base IP model";
+
+      uses ipv6-autoconf-top;
+    }
+
+}
\ No newline at end of file
diff --git a/yang/openconfig-if-ip.yang b/yang/openconfig-if-ip.yang
new file mode 100644
index 0000000000000000000000000000000000000000..17965614fc5000a160d9e2a648ba13060e17c427
--- /dev/null
+++ b/yang/openconfig-if-ip.yang
@@ -0,0 +1,1002 @@
+module openconfig-if-ip {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/interfaces/ip";
+
+  prefix "oc-ip";
+
+  // import some basic types
+  import ietf-inet-types { prefix inet; }
+  import openconfig-interfaces { prefix oc-if; }
+  import openconfig-vlan { prefix oc-vlan; }
+  import ietf-yang-types { prefix yang; }
+  import openconfig-extensions { prefix oc-ext; }
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    netopenconfig@googlegroups.com";
+
+  description
+    "Model for managing IP interfaces.
+
+    This model reuses most of the IETF YANG model for IP management
+    described by RFC 7277.  The primary differences are in the
+    structure of configuration and state data.";
+
+  oc-ext:openconfig-version "1.1.0";
+
+  revision "2016-12-22" {
+    description
+      "Fixes to Ethernet interfaces model";
+    reference "1.1.0";
+  }
+
+
+  // typedef statements
+
+  typedef ip-address-origin {
+    type enumeration {
+      enum OTHER {
+        description
+          "None of the following.";
+        }
+      enum STATIC {
+        description
+          "Indicates that the address has been statically
+          configured - for example, using NETCONF or a Command Line
+          Interface.";
+      }
+      enum DHCP {
+        description
+          "Indicates an address that has been assigned to this
+          system by a DHCP server.";
+      }
+      enum LINK_LAYER {
+        description
+          "Indicates an address created by IPv6 stateless
+          autoconfiguration that embeds a link-layer address in its
+          interface identifier.";
+      }
+      enum RANDOM {
+        description
+          "[adapted from RFC 7277]
+
+          Indicates an address chosen by the system at
+          random, e.g., an IPv4 address within 169.254/16, an
+          RFC 4941 temporary address, or an RFC 7217 semantically
+          opaque address.";
+        reference
+          "RFC 4941: Privacy Extensions for Stateless Address
+                    Autoconfiguration in IPv6
+          RFC 7217: A Method for Generating Semantically Opaque
+                    Interface Identifiers with IPv6 Stateless
+                    Address Autoconfiguration (SLAAC)";
+      }
+    }
+    description
+     "The origin of an address.";
+  }
+
+  typedef neighbor-origin {
+    type enumeration {
+      enum OTHER {
+       description
+         "None of the following.";
+      }
+      enum STATIC {
+       description
+         "Indicates that the mapping has been statically
+          configured - for example, using NETCONF or a Command Line
+          Interface.";
+      }
+      enum DYNAMIC {
+       description
+        "[adapted from RFC 7277]
+
+        Indicates that the mapping has been dynamically resolved
+        using, e.g., IPv4 ARP or the IPv6 Neighbor Discovery
+        protocol.";
+      }
+    }
+    description
+      "The origin of a neighbor entry.";
+  }
+
+  // grouping statements
+
+  grouping ipv4-global-config {
+    description "Configuration data for IPv4 interfaces across
+    all addresses assigned to the interface";
+    reference "RFC 7277 - A YANG Data Model for IP Management";
+
+    leaf enabled {
+     type boolean;
+     default true;
+     description
+       "Controls whether IPv4 is enabled or disabled on this
+        interface.  When IPv4 is enabled, this interface is
+        connected to an IPv4 stack, and the interface can send
+        and receive IPv4 packets.";
+    }
+
+    leaf mtu {
+     type uint16 {
+       range "68..max";
+     }
+     units octets;
+     description
+       "The size, in octets, of the largest IPv4 packet that the
+        interface will send and receive.
+
+        The server may restrict the allowed values for this leaf,
+        depending on the interface's type.
+
+        If this leaf is not configured, the operationally used MTU
+        depends on the interface's type.";
+     reference
+       "RFC 791: Internet Protocol";
+    }
+
+  }
+
+  grouping ipv4-address-config {
+
+    description
+      "Per IPv4 adresss configuration data for the
+      interface.";
+
+    leaf ip {
+       type inet:ipv4-address-no-zone;
+       description
+        "[adapted from IETF IP model RFC 7277]
+
+        The IPv4 address on the interface.";
+    }
+
+    leaf prefix-length {
+      type uint8 {
+       range "0..32";
+      }
+      description
+       "[adapted from IETF IP model RFC 7277]
+
+       The length of the subnet prefix.";
+    }
+  }
+
+  grouping ipv4-neighbor-config {
+    description
+      "[adapted from IETF IP model RFC 7277]
+
+      Per IPv4 neighbor configuration data. Neighbor
+      entries are analagous to static ARP entries, i.e., they
+      create a correspondence between IP and link-layer addresses";
+
+    leaf ip {
+     type inet:ipv4-address-no-zone;
+     description
+       "The IPv4 address of the neighbor node.";
+    }
+    leaf link-layer-address {
+     type yang:phys-address;
+     mandatory true;
+     description
+       "The link-layer address of the neighbor node.";
+    }
+  }
+
+  grouping ipv4-address-state {
+    description
+      "State variables for IPv4 addresses on the interface";
+
+    leaf origin {
+      type ip-address-origin;
+      description
+       "The origin of this address, e.g., statically configured,
+       assigned by DHCP, etc..";
+    }
+  }
+
+  grouping ipv4-neighbor-state {
+    description
+      "State variables for IPv4 neighbor entries on the interface.";
+
+    leaf origin {
+      type neighbor-origin;
+      description
+        "The origin of this neighbor entry, static or dynamic.";
+    }
+  }
+
+  grouping ipv6-global-config {
+    description
+      "Configuration data at the global level for each
+      IPv6 interface";
+
+    leaf enabled {
+      type boolean;
+      default true;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        Controls whether IPv6 is enabled or disabled on this
+        interface.  When IPv6 is enabled, this interface is
+        connected to an IPv6 stack, and the interface can send
+        and receive IPv6 packets.";
+    }
+
+    leaf mtu {
+      type uint32 {
+       range "1280..max";
+      }
+      units octets;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The size, in octets, of the largest IPv6 packet that the
+        interface will send and receive.
+
+        The server may restrict the allowed values for this leaf,
+        depending on the interface's type.
+
+        If this leaf is not configured, the operationally used MTU
+        depends on the interface's type.";
+      reference
+        "RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
+                  Section 5";
+    }
+
+    leaf dup-addr-detect-transmits {
+      type uint32;
+      default 1;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The number of consecutive Neighbor Solicitation messages
+        sent while performing Duplicate Address Detection on a
+        tentative address.  A value of zero indicates that
+        Duplicate Address Detection is not performed on
+        tentative addresses.  A value of one indicates a single
+        transmission with no follow-up retransmissions.";
+      reference
+        "RFC 4862: IPv6 Stateless Address Autoconfiguration";
+    }
+  }
+
+  grouping ipv6-address-config {
+    description "Per-address configuration data for IPv6 interfaces";
+
+    leaf ip {
+      type inet:ipv6-address-no-zone;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The IPv6 address on the interface.";
+    }
+
+    leaf prefix-length {
+      type uint8 {
+        range "0..128";
+      }
+      mandatory true;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The length of the subnet prefix.";
+    }
+  }
+
+  grouping ipv6-address-state {
+    description
+      "Per-address operational state data for IPv6 interfaces";
+
+    leaf origin {
+      type ip-address-origin;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The origin of this address, e.g., static, dhcp, etc.";
+    }
+
+    leaf status {
+      type enumeration {
+        enum PREFERRED {
+          description
+            "This is a valid address that can appear as the
+            destination or source address of a packet.";
+        }
+        enum DEPRECATED {
+          description
+            "This is a valid but deprecated address that should
+            no longer be used as a source address in new
+            communications, but packets addressed to such an
+            address are processed as expected.";
+        }
+        enum INVALID {
+          description
+            "This isn't a valid address, and it shouldn't appear
+            as the destination or source address of a packet.";
+        }
+        enum INACCESSIBLE {
+          description
+            "The address is not accessible because the interface
+            to which this address is assigned is not
+            operational.";
+        }
+        enum UNKNOWN {
+          description
+            "The status cannot be determined for some reason.";
+        }
+        enum TENTATIVE {
+          description
+            "The uniqueness of the address on the link is being
+            verified.  Addresses in this state should not be
+            used for general communication and should only be
+            used to determine the uniqueness of the address.";
+        }
+        enum DUPLICATE {
+          description
+           "The address has been determined to be non-unique on
+            the link and so must not be used.";
+        }
+        enum OPTIMISTIC {
+          description
+            "The address is available for use, subject to
+            restrictions, while its uniqueness on a link is
+            being verified.";
+        }
+      }
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The status of an address.  Most of the states correspond
+        to states from the IPv6 Stateless Address
+        Autoconfiguration protocol.";
+      reference
+          "RFC 4293: Management Information Base for the
+                      Internet Protocol (IP)
+                      - IpAddressStatusTC
+            RFC 4862: IPv6 Stateless Address Autoconfiguration";
+    }
+  }
+
+  grouping ipv6-neighbor-config {
+    description
+      "Per-neighbor configuration data for IPv6 interfaces";
+
+    leaf ip {
+      type inet:ipv6-address-no-zone;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The IPv6 address of the neighbor node.";
+    }
+
+    leaf link-layer-address {
+      type yang:phys-address;
+      mandatory true;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The link-layer address of the neighbor node.";
+    }
+  }
+
+  grouping ipv6-neighbor-state {
+    description "Per-neighbor state variables for IPv6 interfaces";
+
+    leaf origin {
+      type neighbor-origin;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The origin of this neighbor entry.";
+    }
+    leaf is-router {
+      type empty;
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        Indicates that the neighbor node acts as a router.";
+    }
+    leaf neighbor-state {
+      type enumeration {
+        enum INCOMPLETE {
+          description
+          "Address resolution is in progress, and the link-layer
+                address of the neighbor has not yet been
+                determined.";
+        }
+        enum REACHABLE {
+          description
+          "Roughly speaking, the neighbor is known to have been
+                reachable recently (within tens of seconds ago).";
+        }
+        enum STALE {
+          description
+          "The neighbor is no longer known to be reachable, but
+                until traffic is sent to the neighbor no attempt
+                should be made to verify its reachability.";
+        }
+        enum DELAY {
+          description
+          "The neighbor is no longer known to be reachable, and
+                traffic has recently been sent to the neighbor.
+                Rather than probe the neighbor immediately, however,
+                delay sending probes for a short while in order to
+                give upper-layer protocols a chance to provide
+                reachability confirmation.";
+        }
+        enum PROBE {
+          description
+          "The neighbor is no longer known to be reachable, and
+                unicast Neighbor Solicitation probes are being sent
+                to verify reachability.";
+        }
+      }
+      description
+        "[adapted from IETF IP model RFC 7277]
+
+        The Neighbor Unreachability Detection state of this
+        entry.";
+      reference
+        "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
+             Section 7.3.2";
+    }
+  }
+
+  grouping ip-vrrp-ipv6-config {
+    description
+      "IPv6-specific configuration data for VRRP on IPv6
+      interfaces";
+
+      leaf virtual-link-local {
+        type inet:ip-address;
+        description
+          "For VRRP on IPv6 interfaces, sets the virtual link local
+          address";
+      }
+  }
+
+  grouping ip-vrrp-ipv6-state {
+    description
+      "IPv6-specific operational state for VRRP on IPv6 interfaces";
+
+    uses ip-vrrp-ipv6-config;
+  }
+
+  grouping ip-vrrp-tracking-config {
+    description
+      "Configuration data for tracking interfaces
+      in a VRRP group";
+
+    leaf track-interface {
+      type leafref {
+        path "/oc-if:interfaces/oc-if:interface/oc-if:name";
+      }
+      // TODO: we may need to add some restriction to ethernet
+      // or IP interfaces.
+      description "Sets an interface that should be
+      tracked for up/down events to dynamically change the
+      priority state of the VRRP group, and potentially
+      change the mastership if the tracked interface going
+      down lowers the priority sufficiently";
+    }
+
+    leaf priority-decrement {
+      type uint8 {
+        range 0..254;
+      }
+      default 0;
+      description "Set the value to subtract from priority when
+      the tracked interface goes down";
+    }
+  }
+
+  grouping ip-vrrp-tracking-state {
+    description
+      "Operational state data for tracking interfaces in a VRRP
+      group";
+  }
+
+  grouping ip-vrrp-tracking-top {
+    description
+      "Top-level grouping for VRRP interface tracking";
+
+    container interface-tracking {
+      description
+        "Top-level container for VRRP interface tracking";
+
+      container config {
+        description
+          "Configuration data for VRRP interface tracking";
+
+        uses ip-vrrp-tracking-config;
+      }
+
+      container state {
+
+        config false;
+
+        description
+          "Operational state data for VRRP interface tracking";
+
+        uses ip-vrrp-tracking-config;
+        uses ip-vrrp-tracking-state;
+      }
+    }
+  }
+
+  grouping ip-vrrp-config {
+    description
+      "Configuration data for VRRP on IP interfaces";
+
+    leaf virtual-router-id {
+      type uint8 {
+        range 1..255;
+      }
+      description
+        "Set the virtual router id for use by the VRRP group.  This
+        usually also determines the virtual MAC address that is
+        generated for the VRRP group";
+    }
+
+    leaf-list virtual-address {
+      type inet:ip-address;
+      description "Configure one or more virtual addresses for the
+      VRRP group";
+    }
+
+    leaf priority {
+      type uint8 {
+        range 1..254;
+      }
+      default 100;
+      description "Specifies the sending VRRP interface's priority
+      for the virtual router.  Higher values equal higher
+      priority";
+    }
+
+    leaf preempt {
+      type boolean;
+      default true;
+      description "When set to true, enables preemption by a higher
+      priority backup router of a lower priority master router";
+    }
+
+    leaf preempt-delay {
+      type uint16 {
+        range 0..3600;
+      }
+      default 0;
+      description "Set the delay the higher priority router waits
+      before preempting";
+    }
+
+    leaf accept-mode {
+      type boolean;
+      // TODO: should we adopt the RFC default given the common
+      // operational practice of setting to true?
+      default false;
+      description "Configure whether packets destined for
+      virtual addresses are accepted even when the virtual
+      address is not owned by the router interface";
+    }
+
+    leaf advertisement-interval {
+      type uint16 {
+        range 1..4095;
+      }
+      // TODO this range is theoretical -- needs to be validated
+      // against major implementations.
+      units "centiseconds";
+      default 100;
+      description "Sets the interval between successive VRRP
+      advertisements -- RFC 5798 defines this as a 12-bit
+      value expressed as 0.1 seconds, with default 100, i.e.,
+      1 second.  Several implementation express this in units of
+      seconds";
+    }
+  }
+
+  grouping ip-vrrp-state {
+    description
+      "Operational state data for VRRP on IP interfaces";
+
+    leaf current-priority {
+      type uint8;
+      description "Operational value of the priority for the
+      interface in the VRRP group";
+    }
+  }
+
+  grouping ip-vrrp-top {
+    description
+      "Top-level grouping for Virtual Router Redundancy Protocol";
+
+    container vrrp {
+      description
+        "Enclosing container for VRRP groups handled by this
+        IP interface";
+
+      reference "RFC 5798 - Virtual Router Redundancy Protocol
+        (VRRP) Version 3 for IPv4 and IPv6";
+
+      list vrrp-group {
+        key "virtual-router-id";
+        description
+          "List of VRRP groups, keyed by virtual router id";
+
+        leaf virtual-router-id {
+          type leafref {
+            path "../config/virtual-router-id";
+          }
+          description
+            "References the configured virtual router id for this
+            VRRP group";
+        }
+
+        container config {
+          description
+            "Configuration data for the VRRP group";
+
+          uses ip-vrrp-config;
+        }
+
+        container state {
+
+          config false;
+
+          description
+            "Operational state data for the VRRP group";
+
+          uses ip-vrrp-config;
+          uses ip-vrrp-state;
+        }
+
+        uses ip-vrrp-tracking-top;
+      }
+    }
+  }
+
+  grouping ipv4-top {
+    description "Top-level configuration and state for IPv4
+    interfaces";
+
+    container ipv4 {
+      description
+        "Parameters for the IPv4 address family.";
+
+      container addresses {
+        description
+          "Enclosing container for address list";
+
+        list address {
+          key "ip";
+          description
+           "The list of configured IPv4 addresses on the interface.";
+
+          leaf ip {
+            type leafref {
+              path "../oc-ip:config/oc-ip:ip";
+            }
+            description "References the configured IP address";
+          }
+
+          container config {
+            description "Configuration data for each configured IPv4
+            address on the interface";
+
+            uses ipv4-address-config;
+
+          }
+
+          container state {
+
+            config false;
+            description "Operational state data for each IPv4 address
+            configured on the interface";
+
+            uses ipv4-address-config;
+            uses ipv4-address-state;
+          }
+
+        }
+      }
+
+      container neighbors {
+        description
+          "Enclosing container for neighbor list";
+
+        list neighbor {
+          key "ip";
+          description
+           "A list of mappings from IPv4 addresses to
+            link-layer addresses.
+
+            Entries in this list are used as static entries in the
+            ARP Cache.";
+          reference
+           "RFC 826: An Ethernet Address Resolution Protocol";
+
+          leaf ip {
+            type leafref  {
+              path "../oc-ip:config/oc-ip:ip";
+            }
+            description "References the configured IP address";
+          }
+
+          container config {
+            description "Configuration data for each configured IPv4
+            address on the interface";
+
+            uses ipv4-neighbor-config;
+
+          }
+
+          container state {
+
+            config false;
+            description "Operational state data for each IPv4 address
+            configured on the interface";
+
+            uses ipv4-neighbor-config;
+            uses ipv4-neighbor-state;
+          }
+        }
+      }
+
+      uses oc-if:sub-unnumbered-top;
+
+      container config {
+        description
+          "Top-level IPv4 configuration data for the interface";
+
+        uses ipv4-global-config;
+      }
+
+      container state {
+
+        config false;
+        description
+          "Top level IPv4 operational state data";
+
+        uses ipv4-global-config;
+      }
+    }
+  }
+
+  grouping ipv6-top {
+    description
+      "Top-level configuration and state for IPv6 interfaces";
+
+    container ipv6 {
+      description
+       "Parameters for the IPv6 address family.";
+
+      container addresses {
+        description
+          "Enclosing container for address list";
+
+        list address {
+          key "ip";
+          description
+           "The list of configured IPv6 addresses on the interface.";
+
+          leaf ip {
+            type leafref {
+              path "../oc-ip:config/oc-ip:ip";
+            }
+            description "References the configured IP address";
+          }
+
+          container config {
+            description
+              "Configuration data for each IPv6 address on
+              the interface";
+
+            uses ipv6-address-config;
+
+          }
+
+          container state {
+
+            config false;
+            description
+              "State data for each IPv6 address on the
+              interface";
+
+            uses ipv6-address-config;
+            uses ipv6-address-state;
+          }
+        }
+      }
+
+      container neighbors {
+        description
+          "Enclosing container for list of IPv6 neighbors";
+
+        list neighbor {
+          key "ip";
+          description
+            "List of IPv6 neighbors";
+
+          leaf ip {
+            type leafref {
+              path "../oc-ip:config/oc-ip:ip";
+            }
+            description
+              "References the configured IP neighbor address";
+          }
+
+          container config {
+            description "Configuration data for each IPv6 address on
+            the interface";
+
+            uses ipv6-neighbor-config;
+
+          }
+
+          container state {
+
+            config false;
+            description "State data for each IPv6 address on the
+            interface";
+
+            uses ipv6-neighbor-config;
+            uses ipv6-neighbor-state;
+          }
+        }
+      }
+      uses oc-if:sub-unnumbered-top;
+
+      container config {
+        description "Top-level config data for the IPv6 interface";
+
+        uses ipv6-global-config;
+      }
+
+      container state {
+        config false;
+        description
+          "Top-level operational state data for the IPv6 interface";
+
+        uses ipv6-global-config;
+
+      }
+    }
+  }
+
+  // augment statements
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+    "oc-if:subinterface" {
+    description
+      "IPv4 addr family configuration for
+      interfaces";
+
+    uses ipv4-top;
+
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+    "oc-if:subinterface" {
+    description
+      "IPv6 addr family configuration for
+      interfaces";
+
+    uses ipv6-top;
+
+  }
+
+  // VRRP for IPv4 interfaces
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+    "oc-if:subinterface/oc-ip:ipv4/oc-ip:addresses/oc-ip:address" {
+
+    description
+      "Additional IP addr family configuration for
+      interfaces";
+
+    uses ip-vrrp-top;
+
+  }
+
+  // VRRP for IPv6 interfaces
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+    "oc-if:subinterface/oc-ip:ipv6/oc-ip:addresses/oc-ip:address" {
+    description
+      "Additional IP addr family configuration for
+      interfaces";
+
+    uses ip-vrrp-top;
+
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+    "oc-if:subinterface/oc-ip:ipv6/oc-ip:addresses/oc-ip:address/" +
+    "vrrp/vrrp-group/config" {
+    description
+      "Additional VRRP data for IPv6 interfaces";
+
+    uses ip-vrrp-ipv6-config;
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+  "oc-if:subinterface/oc-ip:ipv6/oc-ip:addresses/oc-ip:address/vrrp/" +
+    "vrrp-group/state" {
+    description
+      "Additional VRRP data for IPv6 interfaces";
+
+    uses ip-vrrp-ipv6-state;
+  }
+
+  // Augments for for routed VLANs
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-vlan:routed-vlan" {
+    description
+      "IPv4 addr family configuration for
+      interfaces";
+
+    uses ipv4-top;
+
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-vlan:routed-vlan" {
+    description
+      "IPv6 addr family configuration for
+      interfaces";
+
+    uses ipv6-top;
+
+  }
+
+  // VRRP for routed VLAN interfaces
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-vlan:routed-vlan/" +
+    "oc-ip:ipv4/oc-ip:addresses/oc-ip:address" {
+    description
+      "Additional IP addr family configuration for
+      interfaces";
+
+    uses ip-vrrp-top;
+
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-vlan:routed-vlan/" +
+    "oc-ip:ipv6/oc-ip:addresses/oc-ip:address" {
+    description
+      "Additional IP addr family configuration for
+      interfaces";
+
+    uses ip-vrrp-top;
+
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-vlan:routed-vlan/" +
+    "oc-ip:ipv6/oc-ip:addresses/oc-ip:address/vrrp/vrrp-group/config" {
+    description
+      "Additional VRRP data for IPv6 interfaces";
+
+    uses ip-vrrp-ipv6-config;
+  }
+
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-vlan:routed-vlan/" +
+    "oc-ip:ipv6/oc-ip:addresses/oc-ip:address/vrrp/vrrp-group/state" {
+    description
+      "Additional VRRP data for IPv6 interfaces";
+
+    uses ip-vrrp-ipv6-state;
+  }
+
+  // rpc statements
+
+  // notification statements
+}
diff --git a/yang/openconfig-interfaces.yang b/yang/openconfig-interfaces.yang
new file mode 100644
index 0000000000000000000000000000000000000000..e5b4782385f645cfa734a8b1f913efeb2ab08f9c
--- /dev/null
+++ b/yang/openconfig-interfaces.yang
@@ -0,0 +1,933 @@
+module openconfig-interfaces {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/interfaces";
+
+  prefix "oc-if";
+
+  // import some basic types
+  import ietf-interfaces { prefix ietf-if; }
+  import ietf-yang-types { prefix yang; }
+  import openconfig-extensions { prefix oc-ext; }
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    netopenconfig@googlegroups.com";
+
+  description
+    "Model for managing network interfaces and subinterfaces.  This
+    module also defines convenience types / groupings for other
+    models to create references to interfaces:
+
+      base-interface-ref (type) -  reference to a base interface
+      interface-ref (grouping) -  container for reference to a
+        interface + subinterface
+      interface-ref-state (grouping) - container for read-only
+        (opstate) reference to interface + subinterface
+
+    This model reuses data items defined in the IETF YANG model for
+    interfaces described by RFC 7223 with an alternate structure
+    (particularly for operational state data) and and with
+    additional configuration items.";
+
+  oc-ext:openconfig-version "1.1.0";
+
+  revision "2016-12-22" {
+    description
+      "Fixes to Ethernet interfaces model";
+    reference "1.1.0";
+  }
+
+
+  // typedef statements
+
+  typedef base-interface-ref {
+    type leafref {
+      path "/oc-if:interfaces/oc-if:interface/oc-if:name";
+    }
+    description
+      "Reusable type for by-name reference to a base interface.
+      This type may be used in cases where ability to reference
+      a subinterface is not required.";
+  }
+
+  typedef interface-id {
+    type string;
+    description
+      "User-defined identifier for an interface, generally used to
+      name a interface reference.  The id can be arbitrary but a
+      useful convention is to use a combination of base interface
+      name and subinterface index.";
+  }
+
+  // grouping statements
+
+  grouping interface-ref-common {
+    description
+      "Reference leafrefs to interface / subinterface";
+
+    leaf interface {
+      type leafref {
+        path "/oc-if:interfaces/oc-if:interface/oc-if:name";
+      }
+      description
+        "Reference to a base interface.  If a reference to a
+        subinterface is required, this leaf must be specified
+        to indicate the base interface.";
+    }
+
+    leaf subinterface {
+      type leafref {
+        path "/oc-if:interfaces/" +
+          "oc-if:interface[oc-if:name=current()/../interface]/" +
+          "oc-if:subinterfaces/oc-if:subinterface/oc-if:index";
+      }
+      description
+        "Reference to a subinterface -- this requires the base
+        interface to be specified using the interface leaf in
+        this container.  If only a reference to a base interface
+        is requuired, this leaf should not be set.";
+    }
+  }
+
+  grouping interface-ref-state-container {
+    description
+      "Reusable opstate w/container for a reference to an
+      interface or subinterface";
+
+    container state {
+      config false;
+      description
+        "Operational state for interface-ref";
+
+      uses interface-ref-common;
+    }
+  }
+
+  grouping interface-ref {
+    description
+      "Reusable definition for a reference to an interface or
+      subinterface";
+
+    container interface-ref {
+      description
+        "Reference to an interface or subinterface";
+
+      container config {
+        description
+          "Configured reference to interface / subinterface";
+
+        uses interface-ref-common;
+      }
+
+      uses interface-ref-state-container;
+    }
+  }
+
+  grouping interface-ref-state {
+    description
+      "Reusable opstate w/container for a reference to an
+      interface or subinterface";
+
+    container interface-ref {
+      description
+        "Reference to an interface or subinterface";
+
+      uses interface-ref-state-container;
+    }
+  }
+
+
+  grouping interface-common-config {
+    description
+      "Configuration data data nodes common to physical interfaces
+      and subinterfaces";
+
+    leaf name {
+      type string;
+      description
+        "[adapted from IETF interfaces model (RFC 7223)]
+
+        The name of the interface.
+
+        A device MAY restrict the allowed values for this leaf,
+        possibly depending on the type of the interface.
+        For system-controlled interfaces, this leaf is the
+        device-specific name of the interface.  The 'config false'
+        list interfaces/interface[name]/state contains the currently
+        existing interfaces on the device.
+
+        If a client tries to create configuration for a
+        system-controlled interface that is not present in the
+        corresponding state list, the server MAY reject
+        the request if the implementation does not support
+        pre-provisioning of interfaces or if the name refers to
+        an interface that can never exist in the system.  A
+        NETCONF server MUST reply with an rpc-error with the
+        error-tag 'invalid-value' in this case.
+
+        The IETF model in RFC 7223 provides YANG features for the
+        following (i.e., pre-provisioning and arbitrary-names),
+        however they are omitted here:
+
+          If the device supports pre-provisioning of interface
+          configuration, the 'pre-provisioning' feature is
+          advertised.
+
+          If the device allows arbitrarily named user-controlled
+          interfaces, the 'arbitrary-names' feature is advertised.
+
+        When a configured user-controlled interface is created by
+        the system, it is instantiated with the same name in the
+        /interfaces/interface[name]/state list.";
+      reference
+        "RFC 7223: A YANG Data Model for Interface Management";
+    }
+
+    leaf description {
+      type string;
+      description
+        "[adapted from IETF interfaces model (RFC 7223)]
+
+        A textual description of the interface.
+
+        A server implementation MAY map this leaf to the ifAlias
+        MIB object.  Such an implementation needs to use some
+        mechanism to handle the differences in size and characters
+        allowed between this leaf and ifAlias.  The definition of
+        such a mechanism is outside the scope of this document.
+
+        Since ifAlias is defined to be stored in non-volatile
+        storage, the MIB implementation MUST map ifAlias to the
+        value of 'description' in the persistently stored
+        datastore.
+
+        Specifically, if the device supports ':startup', when
+        ifAlias is read the device MUST return the value of
+        'description' in the 'startup' datastore, and when it is
+        written, it MUST be written to the 'running' and 'startup'
+        datastores.  Note that it is up to the implementation to
+
+        decide whether to modify this single leaf in 'startup' or
+        perform an implicit copy-config from 'running' to
+        'startup'.
+
+        If the device does not support ':startup', ifAlias MUST
+        be mapped to the 'description' leaf in the 'running'
+        datastore.";
+      reference
+        "RFC 2863: The Interfaces Group MIB - ifAlias";
+    }
+
+    leaf enabled {
+      type boolean;
+      default "true";
+      description
+        "[adapted from IETF interfaces model (RFC 7223)]
+
+        This leaf contains the configured, desired state of the
+        interface.
+
+        Systems that implement the IF-MIB use the value of this
+        leaf in the 'running' datastore to set
+        IF-MIB.ifAdminStatus to 'up' or 'down' after an ifEntry
+        has been initialized, as described in RFC 2863.
+
+        Changes in this leaf in the 'running' datastore are
+        reflected in ifAdminStatus, but if ifAdminStatus is
+        changed over SNMP, this leaf is not affected.";
+      reference
+        "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
+    }
+
+  }
+
+  grouping interface-phys-config {
+    description
+      "Configuration data for physical interfaces";
+
+    leaf type {
+      type identityref {
+        base ietf-if:interface-type;
+      }
+      mandatory true;
+      description
+        "[adapted from IETF interfaces model (RFC 7223)]
+
+        The type of the interface.
+
+        When an interface entry is created, a server MAY
+        initialize the type leaf with a valid value, e.g., if it
+        is possible to derive the type from the name of the
+        interface.
+
+        If a client tries to set the type of an interface to a
+        value that can never be used by the system, e.g., if the
+        type is not supported or if the type does not match the
+        name of the interface, the server MUST reject the request.
+        A NETCONF server MUST reply with an rpc-error with the
+        error-tag 'invalid-value' in this case.";
+      reference
+        "RFC 2863: The Interfaces Group MIB - ifType";
+    }
+
+    leaf mtu {
+      type uint16;
+      description
+        "Set the max transmission unit size in octets
+        for the physical interface.  If this is not set, the mtu is
+        set to the operational default -- e.g., 1514 bytes on an
+        Ethernet interface.";
+    }
+
+    uses interface-common-config;
+  }
+
+  grouping interface-phys-holdtime-config {
+    description
+      "Configuration data for interface hold-time settings --
+      applies to physical interfaces.";
+
+    leaf up {
+      type uint32;
+      units milliseconds;
+      default 0;
+      description
+        "Dampens advertisement when the interface
+        transitions from down to up.  A zero value means dampening
+        is turned off, i.e., immediate notification.";
+    }
+
+    leaf down {
+      type uint32;
+      units milliseconds;
+      default 0;
+      description
+        "Dampens advertisement when the interface transitions from
+        up to down.  A zero value means dampening is turned off,
+        i.e., immediate notification.";
+    }
+  }
+
+  grouping interface-phys-holdtime-state {
+    description
+      "Operational state data for interface hold-time.";
+  }
+
+  grouping interface-phys-holdtime-top {
+    description
+      "Top-level grouping for setting link transition
+      dampening on physical and other types of interfaces.";
+
+    container hold-time {
+      description
+        "Top-level container for hold-time settings to enable
+        dampening advertisements of interface transitions.";
+
+      container config {
+        description
+          "Configuration data for interface hold-time settings.";
+
+        uses interface-phys-holdtime-config;
+      }
+
+      container state {
+
+        config false;
+
+        description
+          "Operational state data for interface hold-time.";
+
+        uses interface-phys-holdtime-config;
+        uses interface-phys-holdtime-state;
+      }
+    }
+  }
+
+  grouping interface-common-state {
+    description
+      "Operational state data (in addition to intended configuration)
+      at the global level for this interface";
+
+    leaf ifindex {
+      type uint32;
+      description
+        "System assigned number for each interface.  Corresponds to
+        ifIndex object in SNMP Interface MIB";
+      reference
+        "RFC 2863 - The Interfaces Group MIB";
+    }
+
+    leaf admin-status {
+      type enumeration {
+        enum UP {
+          description
+            "Ready to pass packets.";
+        }
+        enum DOWN {
+          description
+            "Not ready to pass packets and not in some test mode.";
+        }
+        enum TESTING {
+          //TODO: This is generally not supported as a configured
+          //admin state, though it's in the standard interfaces MIB.
+          //Consider removing it.
+          description
+            "In some test mode.";
+        }
+      }
+      //TODO:consider converting to an identity to have the
+      //flexibility to remove some values defined by RFC 7223 that
+      //are not used or not implemented consistently.
+      mandatory true;
+      description
+        "[adapted from IETF interfaces model (RFC 7223)]
+
+        The desired state of the interface.  In RFC 7223 this leaf
+        has the same read semantics as ifAdminStatus.  Here, it
+        reflects the administrative state as set by enabling or
+        disabling the interface.";
+      reference
+        "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
+    }
+
+    leaf oper-status {
+      type enumeration {
+        enum UP {
+          value 1;
+          description
+            "Ready to pass packets.";
+        }
+        enum DOWN {
+          value 2;
+          description
+            "The interface does not pass any packets.";
+        }
+        enum TESTING {
+          value 3;
+          description
+            "In some test mode.  No operational packets can
+             be passed.";
+        }
+        enum UNKNOWN {
+          value 4;
+          description
+            "Status cannot be determined for some reason.";
+        }
+        enum DORMANT {
+          value 5;
+          description
+            "Waiting for some external event.";
+        }
+        enum NOT_PRESENT {
+          value 6;
+          description
+            "Some component (typically hardware) is missing.";
+        }
+        enum LOWER_LAYER_DOWN {
+          value 7;
+          description
+            "Down due to state of lower-layer interface(s).";
+        }
+      }
+      //TODO:consider converting to an identity to have the
+      //flexibility to remove some values defined by RFC 7223 that
+      //are not used or not implemented consistently.
+      mandatory true;
+      description
+        "[adapted from IETF interfaces model (RFC 7223)]
+
+        The current operational state of the interface.
+
+         This leaf has the same semantics as ifOperStatus.";
+      reference
+        "RFC 2863: The Interfaces Group MIB - ifOperStatus";
+    }
+
+    leaf last-change {
+      type yang:timeticks;
+      description
+        "Date and time of the last state change of the interface
+        (e.g., up-to-down transition).   This corresponds to the
+        ifLastChange object in the standard interface MIB.";
+      reference
+        "RFC 2863: The Interfaces Group MIB - ifLastChange";
+    }
+
+  }
+
+
+  grouping interface-counters-state {
+    description
+      "Operational state representing interface counters
+      and statistics.  Some of these are adapted from RFC 7223";
+
+      //TODO: we may need to break this list of counters into those
+      //that would appear for physical vs. subinterface or logical
+      //interfaces.  For now, just replicating the full stats
+      //grouping to both interface and subinterface.
+
+    container counters {
+      description
+        "A collection of interface-related statistics objects.";
+
+      reference
+        "RFC 7223 - A YANG Data Model for Interface
+        Management";
+
+      leaf in-octets {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+
+          The total number of octets received on the interface,
+          including framing characters.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifHCInOctets";
+      }
+
+      leaf in-unicast-pkts {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+
+          The number of packets, delivered by this sub-layer to a
+          higher (sub-)layer, that were not addressed to a
+          multicast or broadcast address at this sub-layer.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifHCInUcastPkts";
+      }
+
+      leaf in-broadcast-pkts {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+
+          The number of packets, delivered by this sub-layer to a
+          higher (sub-)layer, that were addressed to a broadcast
+          address at this sub-layer.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifHCInBroadcastPkts";
+      }
+
+      leaf in-multicast-pkts {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+
+
+          The number of packets, delivered by this sub-layer to a
+          higher (sub-)layer, that were addressed to a multicast
+          address at this sub-layer.  For a MAC-layer protocol,
+          this includes both Group and Functional addresses.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifHCInMulticastPkts";
+      }
+
+      leaf in-discards {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+          Changed the counter type to counter64.
+
+          The number of inbound packets that were chosen to be
+          discarded even though no errors had been detected to
+          prevent their being deliverable to a higher-layer
+          protocol.  One possible reason for discarding such a
+          packet could be to free up buffer space.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+
+
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifInDiscards";
+      }
+
+      leaf in-errors {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+          Changed the counter type to counter64.
+
+          For packet-oriented interfaces, the number of inbound
+          packets that contained errors preventing them from being
+          deliverable to a higher-layer protocol.  For character-
+          oriented or fixed-length interfaces, the number of
+          inbound transmission units that contained errors
+          preventing them from being deliverable to a higher-layer
+          protocol.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifInErrors";
+      }
+
+      leaf in-unknown-protos {
+        type yang:counter32;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+          Changed the counter type to counter64.
+
+          For packet-oriented interfaces, the number of packets
+          received via the interface that were discarded because
+          of an unknown or unsupported protocol.  For
+          character-oriented or fixed-length interfaces that
+          support protocol multiplexing, the number of
+          transmission units received via the interface that were
+          discarded because of an unknown or unsupported protocol.
+          For any interface that does not support protocol
+          multiplexing, this counter is not present.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifInUnknownProtos";
+      }
+
+      leaf out-octets {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+          Changed the counter type to counter64.
+
+          The total number of octets transmitted out of the
+          interface, including framing characters.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifHCOutOctets";
+      }
+
+      leaf out-unicast-pkts {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+
+          The total number of packets that higher-level protocols
+          requested be transmitted, and that were not addressed
+          to a multicast or broadcast address at this sub-layer,
+          including those that were discarded or not sent.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifHCOutUcastPkts";
+      }
+
+      leaf out-broadcast-pkts {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+
+          The total number of packets that higher-level protocols
+          requested be transmitted, and that were addressed to a
+          broadcast address at this sub-layer, including those
+          that were discarded or not sent.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifHCOutBroadcastPkts";
+      }
+
+
+      leaf out-multicast-pkts {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+          Changed the counter type to counter64.
+
+          The total number of packets that higher-level protocols
+          requested be transmitted, and that were addressed to a
+          multicast address at this sub-layer, including those
+          that were discarded or not sent.  For a MAC-layer
+          protocol, this includes both Group and Functional
+          addresses.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifHCOutMulticastPkts";
+      }
+
+      leaf out-discards {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+          Changed the counter type to counter64.
+
+          The number of outbound packets that were chosen to be
+          discarded even though no errors had been detected to
+          prevent their being transmitted.  One possible reason
+          for discarding such a packet could be to free up buffer
+          space.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifOutDiscards";
+      }
+
+      leaf out-errors {
+        type yang:counter64;
+        description
+          "[adapted from IETF interfaces model (RFC 7223)]
+          Changed the counter type to counter64.
+
+          For packet-oriented interfaces, the number of outbound
+          packets that could not be transmitted because of errors.
+          For character-oriented or fixed-length interfaces, the
+          number of outbound transmission units that could not be
+          transmitted because of errors.
+
+          Discontinuities in the value of this counter can occur
+          at re-initialization of the management system, and at
+          other times as indicated by the value of
+          'discontinuity-time'.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifOutErrors";
+      }
+
+      leaf last-clear {
+        type yang:date-and-time;
+        description
+          "Indicates the last time the interface counters were
+          cleared.";
+      }
+    }
+  }
+
+  // data definition statements
+
+  grouping sub-unnumbered-config {
+    description
+      "Configuration data for unnumbered subinterfaces";
+
+    leaf enabled {
+      type boolean;
+      default false;
+      description
+        "Indicates that the subinterface is unnumbered.  By default
+        the subinterface is numbered, i.e., expected to have an
+        IP address configuration.";
+    }
+  }
+
+  grouping sub-unnumbered-state {
+    description
+      "Operational state data unnumbered subinterfaces";
+  }
+
+  grouping sub-unnumbered-top {
+    description
+      "Top-level grouping unnumbered subinterfaces";
+
+    container unnumbered {
+      description
+        "Top-level container for setting unnumbered interfaces.
+        Includes reference the interface that provides the
+        address information";
+
+      container config {
+        description
+          "Configuration data for unnumbered interface";
+
+        uses sub-unnumbered-config;
+      }
+
+      container state {
+
+        config false;
+
+        description
+          "Operational state data for unnumbered interfaces";
+
+        uses sub-unnumbered-config;
+        uses sub-unnumbered-state;
+      }
+
+      uses oc-if:interface-ref;
+    }
+  }
+
+  grouping subinterfaces-config {
+    description
+      "Configuration data for subinterfaces";
+
+    leaf index {
+      type uint32;
+      default 0;
+      description
+        "The index of the subinterface, or logical interface number.
+        On systems with no support for subinterfaces, or not using
+        subinterfaces, this value should default to 0, i.e., the
+        default subinterface.";
+    }
+
+    uses interface-common-config;
+
+  }
+
+  grouping subinterfaces-state {
+    description
+      "Operational state data for subinterfaces";
+
+    uses interface-common-state;
+    uses interface-counters-state;
+  }
+
+  grouping subinterfaces-top {
+    description
+      "Subinterface data for logical interfaces associated with a
+      given interface";
+
+    container subinterfaces {
+      description
+        "Enclosing container for the list of subinterfaces associated
+        with a physical interface";
+
+      list subinterface {
+        key "index";
+
+        description
+          "The list of subinterfaces (logical interfaces) associated
+          with a physical interface";
+
+        leaf index {
+          type leafref {
+            path "../config/index";
+          }
+          description
+            "The index number of the subinterface -- used to address
+            the logical interface";
+        }
+
+        container config {
+          description
+            "Configurable items at the subinterface level";
+
+          uses subinterfaces-config;
+        }
+
+        container state {
+
+          config false;
+          description
+            "Operational state data for logical interfaces";
+
+          uses subinterfaces-config;
+          uses subinterfaces-state;
+        }
+      }
+    }
+  }
+
+  grouping interfaces-top {
+    description
+      "Top-level grouping for interface configuration and
+      operational state data";
+
+    container interfaces {
+      description
+        "Top level container for interfaces, including configuration
+        and state data.";
+
+
+      list interface {
+        key "name";
+
+        description
+          "The list of named interfaces on the device.";
+
+        leaf name {
+          type leafref {
+            path "../config/name";
+          }
+          description
+            "References the configured name of the interface";
+            //TODO: need to consider whether this should actually
+            //reference the name in the state subtree, which
+            //presumably would be the system-assigned name, or the
+            //configured name.  Points to the config/name now
+            //because of YANG 1.0 limitation that the list
+            //key must have the same "config" as the list, and
+            //also can't point to a non-config node.
+        }
+
+        container config {
+          description
+            "Configurable items at the global, physical interface
+            level";
+
+          uses interface-phys-config;
+        }
+
+        container state {
+
+          config false;
+          description
+            "Operational state data at the global interface level";
+
+          uses interface-phys-config;
+          uses interface-common-state;
+          uses interface-counters-state;
+        }
+
+        uses interface-phys-holdtime-top;
+        uses subinterfaces-top;
+      }
+    }
+  }
+
+  uses interfaces-top;
+
+
+}
diff --git a/yang/openconfig-vlan-types.yang b/yang/openconfig-vlan-types.yang
new file mode 100644
index 0000000000000000000000000000000000000000..dd095cebdebf6b0205854694649632f86a421d2b
--- /dev/null
+++ b/yang/openconfig-vlan-types.yang
@@ -0,0 +1,180 @@
+module openconfig-vlan-types {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/vlan-types";
+
+  prefix "oc-vlan-types";
+
+  // import some basic types
+  import openconfig-extensions { prefix oc-ext; }
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    netopenconfig@googlegroups.com";
+
+  description
+    "This module defines configuration and state variables for VLANs,
+    in addition to VLAN parameters associated with interfaces";
+
+  oc-ext:openconfig-version "1.0.2";
+
+  revision "2016-05-26" {
+    description
+      "OpenConfig public release";
+    reference "1.0.2";
+  }
+
+  // extension statements
+
+  // feature statements
+
+  // identity statements
+
+  identity TPID_TYPES {
+    description
+      "Base identity for TPID values that can override the VLAN
+      ethertype value";
+  }
+
+  identity TPID_0x8100 {
+    base TPID_TYPES;
+    description
+      "Default TPID value for 802.1q single-tagged VLANs.";
+  }
+
+  identity TPID_0x8A88 {
+    base TPID_TYPES;
+    description
+      "TPID value for 802.1ad provider bridging, Q-in-Q,
+      or stacked VLANs";
+  }
+
+  identity TPID_0x9100 {
+    base TPID_TYPES;
+    description
+      "Alternate TPID value";
+  }
+
+  identity TPID_0X9200 {
+    base TPID_TYPES;
+    description
+      "Alternate TPID value";
+  }
+
+  // typedef statements
+
+  // TODO: typedefs should be defined in a vlan-types.yang file.
+  typedef vlan-id {
+    type uint16 {
+      range 1..4094;
+    }
+    description
+      "Type definition representing a single-tagged VLAN";
+  }
+
+  typedef vlan-range {
+    type string {
+      // range specified as [lower]..[upper]
+      pattern "(409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"       +
+              "[1-9][0-9]{1,2}|[1-9])\.\.(409[0-4]|"        +
+              "40[0-8][0-9]|[1-3][0-9]{3}|[1-9][0-9]{1,2}|" +
+              "[1-9])";
+    }
+    description
+      "Type definition representing a range of single-tagged
+      VLANs. A range is specified as x..y where x and y are
+      valid VLAN IDs (1 <= vlan-id <= 4094). The range is
+      assumed to be inclusive, such that any VLAN-ID matching
+      x <= VLAN-ID <= y falls within the range.";
+  }
+
+  typedef qinq-id {
+    type string {
+      pattern
+        "(409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"       +
+        "[1-9][0-9]{1,2}|[1-9])\."                    +
+        "((409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"      +
+        "[1-9][0-9]{1,2}|[1-9])|\*)";
+    }
+    description
+      "Type definition representing a single double-tagged/QinQ VLAN
+      identifier. The format of a QinQ VLAN-ID is x.y where X is the
+      'outer' VLAN identifier, and y is the 'inner' VLAN identifier.
+      Both x and y must be valid VLAN IDs (1 <= vlan-id <= 4094)
+      with the exception that y may be equal to a wildcard (*). In
+      cases where y is set to the wildcard, this represents all inner
+      VLAN identifiers where the outer VLAN identifier is equal to
+      x";
+  }
+
+  typedef qinq-id-range {
+    type union {
+      type string {
+        // match cases where the range is specified as x..y.z
+        pattern
+          "(409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"    +
+          "[1-9][0-9]{1,2}|[1-9])\.\."               +
+          "(409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"    +
+          "[1-9][0-9]{1,2}|[1-9])\."                 +
+          "((409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"   +
+          "[1-9][0-9]{1,2}|[1-9])|\*)";
+      }
+      type string {
+        // match cases where the range is specified as x.y..z
+        pattern
+          "(\*|(409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"    +
+          "[1-9][0-9]{1,2}|[1-9]))\."                 +
+          "(409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"    +
+          "[1-9][0-9]{1,2}|[1-9])\.\."               +
+          "(409[0-4]|40[0-8][0-9]|[1-3][0-9]{3}|"    +
+          "[1-9][0-9]{1,2}|[1-9])";
+      }
+    }
+    description
+      "A type definition representing a range of double-tagged/QinQ
+      VLAN identifiers. The format of a QinQ VLAN-ID range can be
+      specified in three formats. Where the range is outer VLAN IDs
+      the range is specified as x..y.z. In this case outer VLAN
+      identifiers meeting the criteria x <= outer-vlan-id <= y are
+      accepted iff the inner VLAN-ID is equal to y - or any inner-tag
+      if the wildcard is specified. Alternatively the range can be
+      specified as x.y..z. In this case only VLANs with an
+      outer-vlan-id qual to x are accepted (x may again be the
+      wildcard). Inner VLANs are accepted if they meet the inequality
+      y <= inner-vlan-id <= z.";
+  }
+
+  typedef vlan-mode-type {
+    type enumeration {
+      enum ACCESS {
+        description "Access mode VLAN interface (No 802.1q header)";
+      }
+      enum TRUNK {
+        description "Trunk mode VLAN interface";
+      }
+    }
+    description
+      "VLAN interface mode (trunk or access)";
+  }
+
+  typedef vlan-ref {
+    type union {
+      type vlan-id;
+      type string;
+      // TODO: string should be changed to leafref to reference
+      // an existing VLAN.  this is not allowed in YANG 1.0 but
+      // is expected to be in YANG 1.1.
+      // type leafref {
+      //  path "vlan:vlans/vlan:vlan/vlan:config/vlan:name";
+      // }
+    }
+    description
+      "Reference to a VLAN by name or id";
+  }
+
+}
diff --git a/yang/openconfig-vlan.yang b/yang/openconfig-vlan.yang
new file mode 100644
index 0000000000000000000000000000000000000000..afc61fd5ddf0f33948ca5678cecfd33887bf9a37
--- /dev/null
+++ b/yang/openconfig-vlan.yang
@@ -0,0 +1,407 @@
+module openconfig-vlan {
+
+  yang-version "1";
+
+  // namespace
+  namespace "http://openconfig.net/yang/vlan";
+
+  prefix "oc-vlan";
+
+  // import some basic types
+  import openconfig-vlan-types { prefix oc-vlan-types; }
+  import openconfig-interfaces { prefix oc-if; }
+  import openconfig-if-ethernet { prefix oc-eth; }
+  import openconfig-if-aggregate { prefix oc-lag; }
+  import iana-if-type { prefix ift; }
+  import openconfig-extensions { prefix oc-ext; }
+
+  // meta
+  organization "OpenConfig working group";
+
+  contact
+    "OpenConfig working group
+    netopenconfig@googlegroups.com";
+
+  description
+    "This module defines configuration and state variables for VLANs,
+    in addition to VLAN parameters associated with interfaces";
+
+  oc-ext:openconfig-version "1.0.2";
+
+  revision "2016-05-26" {
+    description
+      "OpenConfig public release";
+    reference "1.0.2";
+  }
+
+
+
+  // grouping statements
+
+  grouping vlan-config {
+    description "VLAN configuration container.";
+
+    leaf vlan-id {
+      type oc-vlan-types:vlan-id;
+      description "Interface VLAN id.";
+    }
+
+    leaf name {
+      type string;
+      description "Interface VLAN name.";
+    }
+
+    leaf status {
+      type enumeration {
+        enum ACTIVE {
+          description "VLAN is active";
+        }
+        enum SUSPENDED {
+          description "VLAN is inactive / suspended";
+        }
+      }
+      default ACTIVE;
+      description "Admin state of the VLAN";
+    }
+
+    leaf tpid {
+      type identityref {
+        base oc-vlan-types:TPID_TYPES;
+      }
+      default oc-vlan-types:TPID_0x8100;
+      description
+        "Optionally set the tag protocol identifier field (TPID) that
+        is accepted on the VLAN";
+    }
+
+  }
+
+  grouping vlan-state {
+    description "State variables for VLANs";
+
+  }
+
+  grouping vlan-members-state {
+    description
+      "List of interfaces / subinterfaces belonging to the VLAN.";
+
+    container members {
+      description
+        "Enclosing container for list of member interfaces";
+
+      list member {
+        config false;
+        description
+          "List of references to interfaces / subinterfaces
+          associated with the VLAN.";
+
+        uses oc-if:interface-ref-state;
+      }
+    }
+  }
+
+  grouping vlan-ethernet-config {
+    description
+      "VLAN related configuration that is part of the physical
+      Ethernet interface.";
+
+    leaf interface-mode {
+      type oc-vlan-types:vlan-mode-type;
+      description
+        "Set the interface to access or trunk mode for
+        VLANs";
+    }
+
+    leaf native-vlan {
+      when "interface-mode = 'TRUNK'" {
+        description
+          "Native VLAN is valid for trunk mode interfaces";
+      }
+      type union {
+        type oc-vlan-types:vlan-id;
+        type oc-vlan-types:qinq-id;
+      }
+      description
+        "Set the native VLAN id for untagged frames arriving on
+        a trunk interface.  This configuration is only valid on
+        a trunk interface.";
+    }
+
+  leaf access-vlan {
+      when "interface-mode = 'ACCESS'" {
+        description
+          "Access VLAN assigned to the interfaces";
+      }
+      type union {
+        type oc-vlan-types:vlan-id;
+        type oc-vlan-types:qinq-id;
+      }
+      description
+        "Assign the access vlan to the access port.";
+    }
+
+    leaf-list trunk-vlans {
+      when "interface-mode = 'TRUNK'" {
+        description
+          "Allowed VLANs may be specified for trunk mode
+          interfaces.";
+      }
+      type union {
+        type oc-vlan-types:vlan-id;
+        type oc-vlan-types:vlan-range;
+        type oc-vlan-types:qinq-id;
+        type oc-vlan-types:qinq-id-range;
+      }
+      description
+        "Specify VLANs, or ranges thereof, that the interface may
+        carry when in trunk mode.  If not specified, all VLANs are
+        allowed on the interface. Ranges are specified in the form
+        x..y, where x<y - ranges are assumed to be inclusive (such
+        that the VLAN range is x <= range <= y.";
+    }
+  }
+
+  grouping vlan-ethernet-state {
+    description
+      "VLAN related operational state that is part of Ethernet
+      interface state data";
+
+    //TODO: placeholder for operational state related to VLANs
+    //on the physical interface
+  }
+
+  grouping vlan-ethernet-top {
+    description
+      "Top-level grouping for VLAN data associated with an
+      Ethernet interface";
+
+    container switched-vlan {
+      description
+        "Enclosing container for VLAN interface-specific
+        data on Ethernet interfaces.  These are for standard
+        L2, switched-style VLANs.";
+
+      container config {
+          description "Configuration parameters for VLANs";
+
+          uses vlan-ethernet-config;
+      }
+
+      container state {
+
+        config false;
+        description "State variables for VLANs";
+
+        uses vlan-ethernet-config;
+        uses vlan-ethernet-state;
+      }
+    }
+  }
+
+  grouping vlan-logical-config {
+    description
+      "VLAN related configuration that is part of subinterface
+      (logical interface) configuration.  These are generally
+      L3 VLANs with an id that is local.";
+
+
+    leaf vlan-id {
+      type union {
+        type oc-vlan-types:vlan-id;
+        type oc-vlan-types:qinq-id;
+      }
+      description
+        "VLAN id for the subinterface -- specified inline for the
+        case of a local VLAN.  The id is scoped to the
+        subinterface, and could be repeated on different
+        subinterfaces.";
+    }
+  }
+
+  grouping vlan-logical-state {
+    description
+      "VLAN related operational state that is part of logical
+      interface state data";
+
+    //TODO: placeholder to add VLAN-specific state variables on
+    //the subinterface
+  }
+
+  grouping vlan-top {
+    description "Top-level grouping for VLAN configuration";
+
+    container vlans {
+      description "Container for VLAN configuration and state
+      variables";
+
+      list vlan {
+        key "vlan-id";
+
+        description "Configured VLANs keyed by id";
+
+        leaf vlan-id {
+          type leafref {
+            path "../config/vlan-id";
+          }
+          description "references the configured vlan-id";
+        }
+
+        container config {
+          description "Configuration parameters for VLANs";
+
+          uses vlan-config;
+        }
+
+        container state {
+
+          config false;
+          description "State variables for VLANs";
+
+          uses vlan-config;
+          uses vlan-state;
+        }
+        uses vlan-members-state;
+      }
+    }
+  }
+
+  grouping vlan-logical-top {
+    description
+      "Top-level grouping for VLAN data associated with a
+      logical interface or subinterface";
+
+    container vlan {
+      description
+        "Enclosing container for VLAN interface-specific
+        data on subinterfaces";
+
+      container config {
+          description "Configuration parameters for VLANs";
+
+          uses vlan-logical-config;
+        }
+
+        container state {
+
+          config false;
+          description "State variables for VLANs";
+
+          uses vlan-logical-config;
+          uses vlan-logical-state;
+        }
+    }
+  }
+
+  grouping vlan-routed-config {
+    description
+      "Configuration data for routed vlans (SVI, IRB, etc.)";
+
+    leaf vlan {
+      type union {
+        // TODO: in YANG 1.1, unions support leafref types which
+        // should be used here to reference a configured VLAN by
+        // id or name
+        type uint16;
+        type string;
+      }
+      description
+        "References the VLAN for which this IP interface
+        provides routing services -- similar to a switch virtual
+        interface (SVI), or integrated routing and bridging interface
+        (IRB) in some implementations.";
+    }
+
+  }
+
+  grouping vlan-routed-state {
+    description
+      "Operational state data for routed vlan interfaces.";
+  }
+
+  grouping vlan-routed-top {
+    description
+      "Top-level grouping for routed vlan logical interfaces";
+
+    container routed-vlan {
+      description
+        "Top-level container for routed vlan interfaces.  These
+        logical interfaces are also known as SVI (switched virtual
+        interface), IRB (integrated routing and bridging), RVI
+        (routed VLAN interface)";
+
+      container config {
+        description
+          "Configuration data for routed vlan interfaces";
+
+        uses vlan-routed-config;
+      }
+
+      container state {
+
+        config false;
+
+        description
+          "Operational state data ";
+
+        uses vlan-routed-config;
+        uses vlan-routed-state;
+      }
+    }
+  }
+
+  // data definition statements
+
+  uses vlan-top;
+
+  // augment statements
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-if:subinterfaces/" +
+    "oc-if:subinterface" {
+    //TODO: augmentation path will need to be updated for
+    //full device model
+    description "Adds VLAN settings to individual subinterfaces";
+
+    uses vlan-logical-top;
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-eth:ethernet" {
+    //TODO: augmentation path will need to be updated for
+    //full device model
+    when "oc-if:type = 'ift:ethernetCsmacd'" {
+      description "Active when the interface is Ethernet";
+    }
+    description "Adds VLAN settings to individual Ethernet
+    interfaces";
+
+    uses vlan-ethernet-top;
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface/oc-lag:aggregation" {
+    //TODO: augmentation path will need to be updated for
+    //full device model
+    when "oc-if:type = 'ift:ieee8023adLag'" {
+      description "Active when the interface is a LAG";
+    }
+    description "Adds VLAN settings to a LAG interface";
+
+    uses vlan-ethernet-top;
+  }
+
+  augment "/oc-if:interfaces/oc-if:interface" {
+    when "oc-if:type = 'ift:l3ipvlan'" {
+      description
+        "Active when the interface is a logical interface providing
+        L3 routing for VLANs";
+    }
+    description
+      "Adds configuration and state for routed VLAN interfaces";
+
+    uses vlan-routed-top;
+  }
+
+
+  // rpc statements
+
+  // notification statements
+
+}