diff --git a/protocols/bgp/packet/bgp.go b/protocols/bgp/packet/bgp.go
index 1859f665c0a96904c5a5cd2c4e7d4d7dfe640c08..f75ce7a0c4403e8d1530c198099d2cbefa605923 100644
--- a/protocols/bgp/packet/bgp.go
+++ b/protocols/bgp/packet/bgp.go
@@ -10,6 +10,7 @@ const (
 	HeaderLen         = 19
 	MinLen            = 19
 	MaxLen            = 4096
+	MinUpdateLen      = 4
 	NLRIMaxLen        = 5
 	CommunityLen      = 4
 	LargeCommunityLen = 12
diff --git a/protocols/bgp/server/BUILD.bazel b/protocols/bgp/server/BUILD.bazel
index 792d140d13132ece8f5b86e0f8597328eb39f0df..631671e09122407f96bf8bf012840bc1e7d99391 100644
--- a/protocols/bgp/server/BUILD.bazel
+++ b/protocols/bgp/server/BUILD.bazel
@@ -47,6 +47,7 @@ go_test(
         "fsm_test.go",
         "server_test.go",
         "update_helper_test.go",
+        "update_sender_test.go",
         "withdraw_test.go",
     ],
     embed = [":go_default_library"],
diff --git a/protocols/bgp/server/fsm_established.go b/protocols/bgp/server/fsm_established.go
index 31a065e8e3703df3b518c7c7051e602133482f9e..e30d2bdf2480aec484ba6481911dced753c29f9a 100644
--- a/protocols/bgp/server/fsm_established.go
+++ b/protocols/bgp/server/fsm_established.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"net"
+	"time"
 
 	bnet "github.com/bio-routing/bio-rd/net"
 	"github.com/bio-routing/bio-rd/protocols/bgp/packet"
@@ -85,14 +86,10 @@ func (s *establishedState) init() error {
 	clientOptions := routingtable.ClientOptions{
 		BestOnly: true,
 	}
-	if s.fsm.options.AddPathRX {
-		s.fsm.updateSender = newUpdateSenderAddPath(s.fsm)
-		clientOptions = s.fsm.peer.addPathSend
-	} else {
-		s.fsm.updateSender = newUpdateSender(s.fsm)
-	}
 
-	s.fsm.updateSender.Start()
+	s.fsm.updateSender = newUpdateSender(s.fsm)
+	s.fsm.updateSender.Start(time.Millisecond * 5)
+
 	s.fsm.adjRIBOut.Register(s.fsm.updateSender)
 	s.fsm.rib.RegisterWithOptions(s.fsm.adjRIBOut, clientOptions)
 
diff --git a/protocols/bgp/server/update_sender.go b/protocols/bgp/server/update_sender.go
index c2df04afbe40280cc19d1251abccc6a54b33ffdf..63c3c7eb4e57b7fe44c3df83141ce539797a05ce 100644
--- a/protocols/bgp/server/update_sender.go
+++ b/protocols/bgp/server/update_sender.go
@@ -4,12 +4,12 @@ import (
 	"sync"
 	"time"
 
-	log "github.com/sirupsen/logrus"
-
-	bnet "github.com/bio-routing/bio-rd/net"
 	"github.com/bio-routing/bio-rd/protocols/bgp/packet"
 	"github.com/bio-routing/bio-rd/route"
 	"github.com/bio-routing/bio-rd/routingtable"
+
+	bnet "github.com/bio-routing/bio-rd/net"
+	log "github.com/sirupsen/logrus"
 )
 
 // UpdateSender converts table changes into BGP update messages
@@ -17,7 +17,6 @@ type UpdateSender struct {
 	routingtable.ClientManager
 	fsm       *FSM
 	iBGP      bool
-	addPath   bool
 	toSendMu  sync.Mutex
 	toSend    map[string]*pathPfxs
 	destroyCh chan struct{}
@@ -28,12 +27,6 @@ type pathPfxs struct {
 	pfxs []bnet.Prefix
 }
 
-func newUpdateSenderAddPath(fsm *FSM) *UpdateSender {
-	u := newUpdateSender(fsm)
-	u.addPath = true
-	return u
-}
-
 func newUpdateSender(fsm *FSM) *UpdateSender {
 	return &UpdateSender{
 		fsm:       fsm,
@@ -44,8 +37,8 @@ func newUpdateSender(fsm *FSM) *UpdateSender {
 }
 
 // Start starts the update sender
-func (u *UpdateSender) Start() {
-	go u.sender()
+func (u *UpdateSender) Start(aggrTime time.Duration) {
+	go u.sender(aggrTime)
 }
 
 // Destroy destroys everything (with greetings to Hatebreed)
@@ -76,8 +69,8 @@ func (u *UpdateSender) AddPath(pfx bnet.Prefix, p *route.Path) error {
 }
 
 // sender serializes BGP update messages
-func (u *UpdateSender) sender() {
-	ticker := time.NewTicker(time.Millisecond * 5)
+func (u *UpdateSender) sender(aggrTime time.Duration) {
+	ticker := time.NewTicker(aggrTime)
 	var err error
 	var pathAttrs *packet.PathAttribute
 	var budget int
@@ -92,24 +85,28 @@ func (u *UpdateSender) sender() {
 		u.toSendMu.Lock()
 
 		for key, pathNLRIs := range u.toSend {
-			budget = packet.MaxLen - int(pathNLRIs.path.BGPPath.Length())
+			budget = packet.MaxLen - packet.HeaderLen - packet.MinUpdateLen - int(pathNLRIs.path.BGPPath.Length())
 			pathAttrs, err = packet.PathAttributes(pathNLRIs.path)
 			if err != nil {
 				log.Errorf("Unable to get path attributes: %v", err)
 				continue
 			}
 
-			updatesPrefixes := make([][]bnet.Prefix, 1)
-			prefixes := make([]bnet.Prefix, 1)
+			updatesPrefixes := make([][]bnet.Prefix, 0, 1)
+			prefixes := make([]bnet.Prefix, 0, 1)
 			for _, pfx := range pathNLRIs.pfxs {
-				budget -= int(packet.BytesInAddr(pfx.Pfxlen())) - 5
+				budget -= int(packet.BytesInAddr(pfx.Pfxlen())) + 1
 				if budget < 0 {
 					updatesPrefixes = append(updatesPrefixes, prefixes)
-					prefixes = make([]bnet.Prefix, 1)
+					prefixes = make([]bnet.Prefix, 0, 1)
+					budget = packet.MaxLen - int(pathNLRIs.path.BGPPath.Length())
 				}
 
 				prefixes = append(prefixes, pfx)
 			}
+			if len(prefixes) > 0 {
+				updatesPrefixes = append(updatesPrefixes, prefixes)
+			}
 
 			delete(u.toSend, key)
 			u.toSendMu.Unlock()
@@ -150,7 +147,11 @@ func (u *UpdateSender) sendUpdates(pathAttrs *packet.PathAttribute, updatePrefix
 // RemovePath withdraws prefix `pfx` from a peer
 func (u *UpdateSender) RemovePath(pfx bnet.Prefix, p *route.Path) bool {
 	err := withDrawPrefixesAddPath(u.fsm.con, u.fsm.options, pfx, p)
-	return err == nil
+	if err != nil {
+		log.Errorf("Unable to withdraw prefix: %v", err)
+		return false
+	}
+	return true
 }
 
 // UpdateNewClient does nothing
diff --git a/protocols/bgp/server/update_sender_test.go b/protocols/bgp/server/update_sender_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..1683c23d12434c711edeb5f2d62bd54882709303
--- /dev/null
+++ b/protocols/bgp/server/update_sender_test.go
@@ -0,0 +1,393 @@
+package server
+
+import (
+	"net"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	bnet "github.com/bio-routing/bio-rd/net"
+	"github.com/bio-routing/bio-rd/protocols/bgp/types"
+	"github.com/bio-routing/bio-rd/route"
+	"github.com/bio-routing/bio-rd/routingtable/filter"
+	"github.com/bio-routing/bio-rd/routingtable/locRIB"
+	btest "github.com/bio-routing/bio-rd/testing"
+)
+
+func TestSender(t *testing.T) {
+	tests := []struct {
+		name            string
+		paths           []pathPfxs
+		generateNLRIs   uint64
+		expectedUpdates [][]byte
+		addPath         bool
+	}{
+		{
+			name: "Two paths with 3 NLRIs each",
+			paths: []pathPfxs{
+				{
+					path: &route.Path{
+						Type: 2,
+						BGPPath: &route.BGPPath{
+							LocalPref: 100,
+						},
+					},
+					pfxs: []bnet.Prefix{
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{10, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{11, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{12, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{13, 0, 0, 0})), 32),
+					},
+				},
+				{
+					path: &route.Path{
+						Type: 2,
+						BGPPath: &route.BGPPath{
+							LocalPref: 200,
+						},
+					},
+					pfxs: []bnet.Prefix{
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{20, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{21, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{22, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{23, 0, 0, 0})), 8),
+					},
+				},
+			},
+			expectedUpdates: [][]byte{
+				{
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 52,
+					2,
+					0, 0, 0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 200,
+					8, 23, 8, 22, 8, 21, 8, 20,
+
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 55,
+					2,
+					0, 0, 0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 100,
+					32, 13, 0, 0, 0, 8, 12, 8, 11, 8, 10,
+				},
+				{
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 55,
+					2,
+					0, 0, 0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 100,
+					32, 13, 0, 0, 0, 8, 12, 8, 11, 8, 10,
+
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 52,
+					2,
+					0, 0, 0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 200,
+					8, 23, 8, 22, 8, 21, 8, 20,
+				},
+			},
+		},
+		{
+			name:    "Two paths with 3 NLRIs each with BGP Add Path",
+			addPath: true,
+			paths: []pathPfxs{
+				{
+					path: &route.Path{
+						Type: 2,
+						BGPPath: &route.BGPPath{
+							LocalPref: 100,
+						},
+					},
+					pfxs: []bnet.Prefix{
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{10, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{11, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{12, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{13, 0, 0, 0})), 32),
+					},
+				},
+				{
+					path: &route.Path{
+						Type: 2,
+						BGPPath: &route.BGPPath{
+							LocalPref: 200,
+						},
+					},
+					pfxs: []bnet.Prefix{
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{20, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{21, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{22, 0, 0, 0})), 8),
+						bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{23, 0, 0, 0})), 8),
+					},
+				},
+			},
+			expectedUpdates: [][]byte{
+				{
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 71,
+					2,
+					0, 0,
+					0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 100,
+					0, 0, 0, 0, 32, 13, 0, 0, 0,
+					0, 0, 0, 0, 8, 12,
+					0, 0, 0, 0, 8, 11,
+					0, 0, 0, 0, 8, 10,
+
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 68,
+					2,
+					0, 0,
+					0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 200,
+					0, 0, 0, 0, 8, 23,
+					0, 0, 0, 0, 8, 22,
+					0, 0, 0, 0, 8, 21,
+					0, 0, 0, 0, 8, 20,
+				},
+				{
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 68,
+					2,
+					0, 0,
+					0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 200,
+					0, 0, 0, 0, 8, 23,
+					0, 0, 0, 0, 8, 22,
+					0, 0, 0, 0, 8, 21,
+					0, 0, 0, 0, 8, 20,
+
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					0, 71,
+					2,
+					0, 0,
+					0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 100,
+					0, 0, 0, 0, 32, 13, 0, 0, 0,
+					0, 0, 0, 0, 8, 12,
+					0, 0, 0, 0, 8, 11,
+					0, 0, 0, 0, 8, 10,
+				},
+			},
+		},
+		{
+			name: "Overflow. Too many NLRIs.",
+			paths: []pathPfxs{
+				{
+					path: &route.Path{
+						Type: 2,
+						BGPPath: &route.BGPPath{
+							LocalPref: 100,
+						},
+					},
+				},
+			},
+			generateNLRIs: 1000,
+			expectedUpdates: [][]byte{
+				{
+					255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+					15, 239, 2, 0, 0, 0, 21, 64, 2, 0, 64, 1, 1, 0, 64, 3, 4, 0, 0, 0, 0, 64, 5, 4, 0, 0, 0, 100,
+					32, 10, 0, 3, 35, 32, 10, 0, 3, 34, 32, 10, 0, 3, 33, 32, 10, 0, 3, 32, 32, 10, 0, 3, 31, 32, 10, 0, 3, 30, 32, 10, 0, 3, 29,
+					32, 10, 0, 3, 28, 32, 10, 0, 3, 27, 32, 10, 0, 3, 26, 32, 10, 0, 3, 25, 32, 10, 0, 3, 24, 32, 10, 0, 3, 23, 32, 10, 0, 3, 22,
+					32, 10, 0, 3, 21, 32, 10, 0, 3, 20, 32, 10, 0, 3, 19, 32, 10, 0, 3, 18, 32, 10, 0, 3, 17, 32, 10, 0, 3, 16, 32, 10, 0, 3, 15,
+					32, 10, 0, 3, 14, 32, 10, 0, 3, 13, 32, 10, 0, 3, 12, 32, 10, 0, 3, 11, 32, 10, 0, 3, 10, 32, 10, 0, 3, 9, 32, 10, 0, 3, 8,
+					32, 10, 0, 3, 7, 32, 10, 0, 3, 6, 32, 10, 0, 3, 5, 32, 10, 0, 3, 4, 32, 10, 0, 3, 3, 32, 10, 0, 3, 2, 32, 10, 0, 3, 1,
+					32, 10, 0, 3, 0, 32, 10, 0, 3, 255, 32, 10, 0, 3, 254, 32, 10, 0, 3, 253, 32, 10, 0, 2, 253, 32, 10, 0, 2, 252, 32, 10, 0, 2, 251,
+					32, 10, 0, 2, 250, 32, 10, 0, 2, 249, 32, 10, 0, 2, 248, 32, 10, 0, 2, 247, 32, 10, 0, 2, 246, 32, 10, 0, 2, 245, 32, 10, 0, 2, 244,
+					32, 10, 0, 2, 243, 32, 10, 0, 2, 242, 32, 10, 0, 2, 241, 32, 10, 0, 2, 240, 32, 10, 0, 2, 239, 32, 10, 0, 2, 238, 32, 10, 0, 2, 237,
+					32, 10, 0, 2, 236, 32, 10, 0, 2, 235, 32, 10, 0, 2, 234, 32, 10, 0, 2, 233, 32, 10, 0, 2, 232, 32, 10, 0, 2, 231, 32, 10, 0, 2, 230,
+					32, 10, 0, 2, 229, 32, 10, 0, 2, 228, 32, 10, 0, 2, 227, 32, 10, 0, 2, 226, 32, 10, 0, 2, 225, 32, 10, 0, 2, 224, 32, 10, 0, 2, 223,
+					32, 10, 0, 2, 222, 32, 10, 0, 2, 221, 32, 10, 0, 2, 220, 32, 10, 0, 2, 219, 32, 10, 0, 2, 218, 32, 10, 0, 2, 217, 32, 10, 0, 2, 216,
+					32, 10, 0, 2, 215, 32, 10, 0, 2, 214, 32, 10, 0, 2, 213, 32, 10, 0, 2, 212, 32, 10, 0, 2, 211, 32, 10, 0, 2, 210, 32, 10, 0, 2, 209,
+					32, 10, 0, 2, 208, 32, 10, 0, 2, 207, 32, 10, 0, 2, 206, 32, 10, 0, 2, 205, 32, 10, 0, 2, 204, 32, 10, 0, 2, 203, 32, 10, 0, 2, 202,
+					32, 10, 0, 2, 201, 32, 10, 0, 2, 200, 32, 10, 0, 2, 199, 32, 10, 0, 2, 198, 32, 10, 0, 2, 197, 32, 10, 0, 2, 196, 32, 10, 0, 2, 195,
+					32, 10, 0, 2, 194, 32, 10, 0, 2, 193, 32, 10, 0, 2, 192, 32, 10, 0, 2, 191, 32, 10, 0, 2, 190, 32, 10, 0, 2, 189, 32, 10, 0, 2, 188,
+					32, 10, 0, 2, 187, 32, 10, 0, 2, 186, 32, 10, 0, 2, 185, 32, 10, 0, 2, 184, 32, 10, 0, 2, 183, 32, 10, 0, 2, 182, 32, 10, 0, 2, 181,
+					32, 10, 0, 2, 180, 32, 10, 0, 2, 179, 32, 10, 0, 2, 178, 32, 10, 0, 2, 177, 32, 10, 0, 2, 176, 32, 10, 0, 2, 175, 32, 10, 0, 2, 174,
+					32, 10, 0, 2, 173, 32, 10, 0, 2, 172, 32, 10, 0, 2, 171, 32, 10, 0, 2, 170, 32, 10, 0, 2, 169, 32, 10, 0, 2, 168, 32, 10, 0, 2, 167,
+					32, 10, 0, 2, 166, 32, 10, 0, 2, 165, 32, 10, 0, 2, 164, 32, 10, 0, 2, 163, 32, 10, 0, 2, 162, 32, 10, 0, 2, 161, 32, 10, 0, 2, 160,
+					32, 10, 0, 2, 159, 32, 10, 0, 2, 158, 32, 10, 0, 2, 157, 32, 10, 0, 2, 156, 32, 10, 0, 2, 155, 32, 10, 0, 2, 154, 32, 10, 0, 2, 153,
+					32, 10, 0, 2, 152, 32, 10, 0, 2, 151, 32, 10, 0, 2, 150, 32, 10, 0, 2, 149, 32, 10, 0, 2, 148, 32, 10, 0, 2, 147, 32, 10, 0, 2, 146,
+					32, 10, 0, 2, 145, 32, 10, 0, 2, 144, 32, 10, 0, 2, 143, 32, 10, 0, 2, 142, 32, 10, 0, 2, 141, 32, 10, 0, 2, 140, 32, 10, 0, 2, 139,
+					32, 10, 0, 2, 138, 32, 10, 0, 2, 137, 32, 10, 0, 2, 136, 32, 10, 0, 2, 135, 32, 10, 0, 2, 134, 32, 10, 0, 2, 133, 32, 10, 0, 2, 132,
+					32, 10, 0, 2, 131, 32, 10, 0, 2, 130, 32, 10, 0, 2, 129, 32, 10, 0, 2, 128, 32, 10, 0, 2, 127, 32, 10, 0, 2, 126, 32, 10, 0, 2, 125,
+					32, 10, 0, 2, 124, 32, 10, 0, 2, 123, 32, 10, 0, 2, 122, 32, 10, 0, 2, 121, 32, 10, 0, 2, 120, 32, 10, 0, 2, 119, 32, 10, 0, 2, 118,
+					32, 10, 0, 2, 117, 32, 10, 0, 2, 116, 32, 10, 0, 2, 115, 32, 10, 0, 2, 114, 32, 10, 0, 2, 113, 32, 10, 0, 2, 112, 32, 10, 0, 2, 111,
+					32, 10, 0, 2, 110, 32, 10, 0, 2, 109, 32, 10, 0, 2, 108, 32, 10, 0, 2, 107, 32, 10, 0, 2, 106, 32, 10, 0, 2, 105, 32, 10, 0, 2, 104,
+					32, 10, 0, 2, 103, 32, 10, 0, 2, 102, 32, 10, 0, 2, 101, 32, 10, 0, 2, 100, 32, 10, 0, 2, 99, 32, 10, 0, 2, 98, 32, 10, 0, 2, 97,
+					32, 10, 0, 2, 96, 32, 10, 0, 2, 95, 32, 10, 0, 2, 94, 32, 10, 0, 2, 93, 32, 10, 0, 2, 92, 32, 10, 0, 2, 91, 32, 10, 0, 2, 90,
+					32, 10, 0, 2, 89, 32, 10, 0, 2, 88, 32, 10, 0, 2, 87, 32, 10, 0, 2, 86, 32, 10, 0, 2, 85, 32, 10, 0, 2, 84, 32, 10, 0, 2, 83,
+					32, 10, 0, 2, 82, 32, 10, 0, 2, 81, 32, 10, 0, 2, 80, 32, 10, 0, 2, 79, 32, 10, 0, 2, 78, 32, 10, 0, 2, 77, 32, 10, 0, 2, 76,
+					32, 10, 0, 2, 75, 32, 10, 0, 2, 74, 32, 10, 0, 2, 73, 32, 10, 0, 2, 72, 32, 10, 0, 2, 71, 32, 10, 0, 2, 70, 32, 10, 0, 2, 69,
+					32, 10, 0, 2, 68, 32, 10, 0, 2, 67, 32, 10, 0, 2, 66, 32, 10, 0, 2, 65, 32, 10, 0, 2, 64, 32, 10, 0, 2, 63, 32, 10, 0, 2, 62,
+					32, 10, 0, 2, 61, 32, 10, 0, 2, 60, 32, 10, 0, 2, 59, 32, 10, 0, 2, 58, 32, 10, 0, 2, 57, 32, 10, 0, 2, 56, 32, 10, 0, 2, 55,
+					32, 10, 0, 2, 54, 32, 10, 0, 2, 53, 32, 10, 0, 2, 52, 32, 10, 0, 2, 51, 32, 10, 0, 2, 50, 32, 10, 0, 2, 49, 32, 10, 0, 2, 48,
+					32, 10, 0, 2, 47, 32, 10, 0, 2, 46, 32, 10, 0, 2, 45, 32, 10, 0, 2, 44, 32, 10, 0, 2, 43, 32, 10, 0, 2, 42, 32, 10, 0, 2, 41,
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+					32, 10, 0, 3, 60, 32, 10, 0, 3, 59, 32, 10, 0, 3, 58, 32, 10, 0, 3, 57, 32, 10, 0, 3, 56, 32, 10, 0, 3, 55, 32, 10, 0, 3, 54,
+					32, 10, 0, 3, 53, 32, 10, 0, 3, 52, 32, 10, 0, 3, 51, 32, 10, 0, 3, 50, 32, 10, 0, 3, 49, 32, 10, 0, 3, 48, 32, 10, 0, 3, 47,
+					32, 10, 0, 3, 46, 32, 10, 0, 3, 45, 32, 10, 0, 3, 44, 32, 10, 0, 3, 43, 32, 10, 0, 3, 42, 32, 10, 0, 3, 41, 32, 10, 0, 3, 40,
+					32, 10, 0, 3, 39, 32, 10, 0, 3, 38, 32, 10, 0, 3, 37, 32, 10, 0, 3, 36,
+				},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		fsmA := newFSM2(&peer{
+			addr:         net.ParseIP("169.254.100.100"),
+			rib:          locRIB.New(),
+			importFilter: filter.NewAcceptAllFilter(),
+			exportFilter: filter.NewAcceptAllFilter(),
+		})
+
+		fsmA.holdTimer = time.NewTimer(time.Second * 90)
+		fsmA.keepaliveTimer = time.NewTimer(time.Second * 30)
+		fsmA.connectRetryTimer = time.NewTimer(time.Second * 120)
+		fsmA.state = newEstablishedState(fsmA)
+		fsmA.con = btest.NewMockConn()
+
+		if test.addPath {
+			fsmA.options = &types.Options{
+				AddPathRX: true,
+			}
+		}
+
+		updateSender := newUpdateSender(fsmA)
+
+		for _, pathPfx := range test.paths {
+			for _, pfx := range pathPfx.pfxs {
+				updateSender.AddPath(pfx, pathPfx.path)
+			}
+			if test.generateNLRIs != 0 {
+				for i := uint64(0); i < test.generateNLRIs; i++ {
+					x := i / 256
+					y := i - x
+					pfx := bnet.NewPfx(bnet.IPv4ToUint32(net.IP([]byte{10, 0, uint8(x), uint8(y)})), 32)
+					updateSender.AddPath(pfx, pathPfx.path)
+				}
+			}
+		}
+
+		updateSender.Start(time.Millisecond)
+		time.Sleep(time.Millisecond * 100)
+
+		recvBuffer := make([]byte, 8192)
+		nbytes, _ := fsmA.con.Read(recvBuffer)
+
+		if len(test.expectedUpdates) == 1 {
+			assert.Equal(t, test.expectedUpdates[0], recvBuffer[:nbytes])
+		} else {
+			ok := false
+			for _, updateSequence := range test.expectedUpdates {
+				if reflect.DeepEqual(recvBuffer[:nbytes], updateSequence) {
+					ok = true
+					break
+				}
+			}
+
+			if !ok {
+				t.Errorf("Expected update for test %q not found: Want: %v Got: %v", test.name, test.expectedUpdates, recvBuffer[:nbytes])
+			}
+		}
+	}
+}
diff --git a/testing/conn_mock.go b/testing/conn_mock.go
index 86e8e1ae7d1c91eaa6efce317d34e8b08212c825..2db28011a5d3080d28b1c24cde9895ebee496cd1 100644
--- a/testing/conn_mock.go
+++ b/testing/conn_mock.go
@@ -1,6 +1,8 @@
 package testing
 
-import "net"
+import (
+	"net"
+)
 
 // MockConn mock an connection
 type MockConn struct {
@@ -27,6 +29,6 @@ func (m *MockConn) Read(b []byte) (n int, err error) {
 		count = len(m.Bytes)
 	}
 
-	copy(m.Bytes[0:count], b)
+	copy(b, m.Bytes[0:count])
 	return count, nil
 }