osrg-gobgp/internal/pkg/table/table_manager_test.go

// Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package table

import (
	_ "fmt"
	"net"
	"testing"
	"time"

	"github.com/osrg/gobgp/v3/pkg/log"
	"github.com/osrg/gobgp/v3/pkg/packet/bgp"

	"github.com/stretchr/testify/assert"
)

var logger = log.NewDefaultLogger()

// process BGPUpdate message
// this function processes only BGPUpdate
func (manager *TableManager) ProcessUpdate(fromPeer *PeerInfo, message *bgp.BGPMessage) ([]*Path, error) {
	pathList := make([]*Path, 0)
	dsts := make([]*Update, 0)
	for _, path := range ProcessMessage(message, fromPeer, time.Now()) {
		dsts = append(dsts, manager.Update(path)...)
	}
	for _, d := range dsts {
		b, _, _ := d.GetChanges(GLOBAL_RIB_NAME, 0, false)
		pathList = append(pathList, b)
	}
	return pathList, nil
}

func peerR1() *PeerInfo {
	peer := &PeerInfo{
		AS:      65000,
		LocalAS: 65000,
		ID:      net.ParseIP("10.0.0.3").To4(),
		LocalID: net.ParseIP("10.0.0.1").To4(),
		Address: net.ParseIP("10.0.0.1").To4(),
	}
	return peer
}

func peerR2() *PeerInfo {
	peer := &PeerInfo{
		AS:      65100,
		LocalAS: 65000,
		Address: net.ParseIP("10.0.0.2").To4(),
	}
	return peer
}

func peerR3() *PeerInfo {
	peer := &PeerInfo{
		AS:      65000,
		LocalAS: 65000,
		ID:      net.ParseIP("10.0.0.2").To4(),
		LocalID: net.ParseIP("10.0.0.1").To4(),
		Address: net.ParseIP("10.0.0.3").To4(),
	}
	return peer
}

// test best path calculation and check the result path is from R1
func TestProcessBGPUpdate_0_select_onlypath_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	bgpMessage := update_fromR1()
	peer := peerR1()
	pList, err := tm.ProcessUpdate(peer, bgpMessage)
	assert.Equal(t, len(pList), 1)
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 4, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.50.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test best path calculation and check the result path is from R1
func TestProcessBGPUpdate_0_select_onlypath_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	bgpMessage := update_fromR1_ipv6()
	peer := peerR1()
	pList, err := tm.ProcessUpdate(peer, bgpMessage)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 4, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:50:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: compare localpref
func TestProcessBGPUpdate_1_select_high_localpref_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// low localpref message
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(0)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// high localpref message
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	nexthop2 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med2 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref2 := bgp.NewPathAttributeLocalPref(200)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, len(pathAttributes2), len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.50.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_1_select_high_localpref_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	mp_reach2 := createMpReach("2001::192:168:100:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref2 := bgp.NewPathAttributeLocalPref(200)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 5, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:100:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: compare localOrigin
func TestProcessBGPUpdate_2_select_local_origin_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// low localpref message
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(0)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// high localpref message
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{})
	nexthop2 := bgp.NewPathAttributeNextHop("0.0.0.0")
	med2 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	var peer2 *PeerInfo = &PeerInfo{
		Address: net.ParseIP("0.0.0.0"),
	}
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, len(pathAttributes2), len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "0.0.0.0"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_2_select_local_origin_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{})
	mp_reach2 := createMpReach("::",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	var peer2 *PeerInfo = &PeerInfo{
		Address: net.ParseIP("0.0.0.0"),
	}

	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 5, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "::"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: compare AS_PATH
func TestProcessBGPUpdate_3_select_aspath_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	bgpMessage1 := update_fromR2viaR1()
	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)
	bgpMessage2 := update_fromR2()
	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 4, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "20.20.20.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.100.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_3_select_aspath_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	bgpMessage1 := update_fromR2viaR1_ipv6()
	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)
	bgpMessage2 := update_fromR2_ipv6()
	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 4, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2002:223:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:100:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: compare Origin
func TestProcessBGPUpdate_4_select_low_origin_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// low origin message
	origin1 := bgp.NewPathAttributeOrigin(1)
	aspath1 := createAsPathAttribute([]uint32{65200, 65000})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// high origin message
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	nexthop2 := bgp.NewPathAttributeNextHop("192.168.100.1")
	med2 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, len(pathAttributes2), len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.100.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_4_select_low_origin_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(1)
	aspath1 := createAsPathAttribute([]uint32{65200, 65000})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	mp_reach2 := createMpReach("2001::192:168:100:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref2 := bgp.NewPathAttributeLocalPref(200)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 5, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:100:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: compare MED
func TestProcessBGPUpdate_5_select_low_med_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// low origin message
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65200, 65000})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(500)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// high origin message
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	nexthop2 := bgp.NewPathAttributeNextHop("192.168.100.1")
	med2 := bgp.NewPathAttributeMultiExitDisc(100)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, len(pathAttributes2), len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.100.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_5_select_low_med_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65200, 65000})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(500)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	mp_reach2 := createMpReach("2001::192:168:100:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 5, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:100:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: compare AS_NUMBER(prefer eBGP path)
func TestProcessBGPUpdate_6_select_ebgp_path_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// low origin message
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000, 65200})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// high origin message
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	nexthop2 := bgp.NewPathAttributeNextHop("192.168.100.1")
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, len(pathAttributes2), len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.100.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_6_select_ebgp_path_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000, 65200})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65200})
	mp_reach2 := createMpReach("2001::192:168:100:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 5, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:100:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: compare IGP cost -> N/A

// test: compare Router ID
func TestProcessBGPUpdate_7_select_low_routerid_path_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})
	SelectionOptions.ExternalCompareRouterId = true

	// low origin message
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000, 65200})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// high origin message
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65000, 65100})
	nexthop2 := bgp.NewPathAttributeNextHop("192.168.100.1")
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer3 := peerR3()
	pList, err = tm.ProcessUpdate(peer3, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes
	expectedOrigin := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedNexthopAttr := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	pathNexthop := attr.(*bgp.PathAttributeNextHop)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, len(pathAttributes2), len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.100.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_7_select_low_routerid_path_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000, 65200})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65200})
	mp_reach2 := createMpReach("2001::192:168:100:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer3 := peerR3()
	pList, err = tm.ProcessUpdate(peer3, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute length
	assert.Equal(t, 5, len(path.GetPathAttrs()))

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:100:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// test: withdraw and mpunreach path
func TestProcessBGPUpdate_8_withdraw_path_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// path1
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// path 2
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	nexthop2 := bgp.NewPathAttributeNextHop("192.168.100.1")
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(200)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes
		expectedOrigin := pathAttributes[0]
		attr := actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedNexthopAttr := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
		pathNexthop := attr.(*bgp.PathAttributeNextHop)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedMed := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)

		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(path.GetPathAttrs()))
	}
	checkPattr(bgpMessage2, path)
	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.100.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

	//withdraw path
	w1 := bgp.NewIPAddrPrefix(24, "10.10.10.0")
	w := []*bgp.IPAddrPrefix{w1}
	bgpMessage3 := bgp.NewBGPUpdateMessage(w, nil, nil)

	pList, err = tm.ProcessUpdate(peer2, bgpMessage3)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	path = pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	checkPattr(bgpMessage1, path)
	// check destination
	expectedPrefix = "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop = "192.168.50.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())
}

// TODO MP_UNREACH
func TestProcessBGPUpdate_8_mpunreach_path_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65100, 65000})
	mp_reach2 := createMpReach("2001::192:168:100:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(200)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	peer2 := peerR2()
	pList, err = tm.ProcessUpdate(peer2, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes

		expectedNexthopAttr := pathAttributes[0]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
		pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedOrigin := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedMed := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)
		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(path.GetPathAttrs()))
	}

	checkPattr(bgpMessage2, path)

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:100:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

	//mpunreach path
	mp_unreach := createMpUNReach("2001:123:123:1::", 64)
	bgpMessage3 := bgp.NewBGPUpdateMessage(nil, []bgp.PathAttributeInterface{mp_unreach}, nil)

	pList, err = tm.ProcessUpdate(peer2, bgpMessage3)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	path = pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	checkPattr(bgpMessage1, path)
	// check destination
	expectedPrefix = "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop = "2001::192:168:50:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// handle bestpath lost
func TestProcessBGPUpdate_bestpath_lost_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// path1
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// path 1 withdraw
	w1 := bgp.NewIPAddrPrefix(24, "10.10.10.0")
	w := []*bgp.IPAddrPrefix{w1}
	bgpMessage1_w := bgp.NewBGPUpdateMessage(w, nil, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage1_w)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, true)
	assert.NoError(t, err)

	// check old best path
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes
		expectedOrigin := pathAttributes[0]
		attr := actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedNexthopAttr := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
		pathNexthop := attr.(*bgp.PathAttributeNextHop)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedMed := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)

		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(path.GetPathAttrs()))
	}

	checkPattr(bgpMessage1, path)
	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
}

func TestProcessBGPUpdate_bestpath_lost_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// path1 mpunreach
	mp_unreach := createMpUNReach("2001:123:123:1::", 64)
	bgpMessage1_w := bgp.NewBGPUpdateMessage(nil, []bgp.PathAttributeInterface{mp_unreach}, nil)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage1_w)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, true)
	assert.NoError(t, err)

	// check old best path
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes

		expectedNexthopAttr := pathAttributes[0]
		attr := actual.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
		pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedOrigin := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedMed := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)
		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(path.GetPathAttrs()))
	}

	checkPattr(bgpMessage1, path)

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
}

// test: implicit withdrawal case
func TestProcessBGPUpdate_implicit_withdrwal_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	// path1
	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000, 65100, 65200})
	nexthop1 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes1 := []bgp.PathAttributeInterface{
		origin1, aspath1, nexthop1, med1, localpref1,
	}
	nlri1 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// path 1 from same peer but short AS_PATH
	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65000, 65100})
	nexthop2 := bgp.NewPathAttributeNextHop("192.168.50.1")
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(100)

	pathAttributes2 := []bgp.PathAttributeInterface{
		origin2, aspath2, nexthop2, med2, localpref2,
	}
	nlri2 := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv4_UC)

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes
		expectedOrigin := pathAttributes[0]
		attr := actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedNexthopAttr := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
		pathNexthop := attr.(*bgp.PathAttributeNextHop)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedMed := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)

		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(path.GetPathAttrs()))
	}
	checkPattr(bgpMessage2, path)
	// check destination
	expectedPrefix := "10.10.10.0/24"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "192.168.50.1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

func TestProcessBGPUpdate_implicit_withdrwal_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	origin1 := bgp.NewPathAttributeOrigin(0)
	aspath1 := createAsPathAttribute([]uint32{65000, 65100, 65200})
	mp_reach1 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med1 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref1 := bgp.NewPathAttributeLocalPref(200)

	pathAttributes1 := []bgp.PathAttributeInterface{
		mp_reach1, origin1, aspath1, med1, localpref1,
	}

	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	origin2 := bgp.NewPathAttributeOrigin(0)
	aspath2 := createAsPathAttribute([]uint32{65000, 65100})
	mp_reach2 := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")})
	med2 := bgp.NewPathAttributeMultiExitDisc(200)
	localpref2 := bgp.NewPathAttributeLocalPref(200)

	pathAttributes2 := []bgp.PathAttributeInterface{
		mp_reach2, origin2, aspath2, med2, localpref2,
	}

	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage2)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check type
	path := pList[0]
	assert.Equal(t, path.GetRouteFamily(), bgp.RF_IPv6_UC)

	// check PathAttribute
	pathAttributes := bgpMessage2.Body.(*bgp.BGPUpdate).PathAttributes

	expectedNexthopAttr := pathAttributes[0]
	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
	pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
	assert.Equal(t, expectedNexthopAttr, pathNexthop)

	expectedOrigin := pathAttributes[1]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
	pathOrigin := attr.(*bgp.PathAttributeOrigin)
	assert.Equal(t, expectedOrigin, pathOrigin)

	expectedAsPath := pathAttributes[2]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
	pathAspath := attr.(*bgp.PathAttributeAsPath)
	assert.Equal(t, expectedAsPath, pathAspath)

	expectedMed := pathAttributes[3]
	attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
	pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
	assert.Equal(t, expectedMed, pathMed)

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes

		expectedNexthopAttr := pathAttributes[0]
		attr := actual.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
		pathNexthop := attr.(*bgp.PathAttributeMpReachNLRI)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedOrigin := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedMed := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)
		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(path.GetPathAttrs()))
	}

	checkPattr(bgpMessage2, path)

	// check destination
	expectedPrefix := "2001:123:123:1::/64"
	assert.Equal(t, expectedPrefix, path.GetPrefix())
	// check nexthop
	expectedNexthop := "2001::192:168:50:1"
	assert.Equal(t, expectedNexthop, path.GetNexthop().String())

}

// check multiple paths
func TestProcessBGPUpdate_multiple_nlri_ipv4(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC})

	createPathAttr := func(aspaths []uint32, nh string) []bgp.PathAttributeInterface {
		origin := bgp.NewPathAttributeOrigin(0)
		aspath := createAsPathAttribute(aspaths)
		nexthop := bgp.NewPathAttributeNextHop(nh)
		med := bgp.NewPathAttributeMultiExitDisc(200)
		localpref := bgp.NewPathAttributeLocalPref(100)
		pathAttr := []bgp.PathAttributeInterface{
			origin, aspath, nexthop, med, localpref,
		}
		return pathAttr
	}

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes
		expectedOrigin := pathAttributes[0]
		attr := actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedNexthopAttr := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
		pathNexthop := attr.(*bgp.PathAttributeNextHop)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedMed := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)

		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(actual.GetPathAttrs()))
	}

	checkBestPathResult := func(rf bgp.RouteFamily, prefix, nexthop string, p *Path, m *bgp.BGPMessage) {
		assert.Equal(t, p.GetRouteFamily(), rf)
		checkPattr(m, p)
		// check destination
		assert.Equal(t, prefix, p.GetPrefix())
		// check nexthop
		assert.Equal(t, nexthop, p.GetNexthop().String())
	}

	// path1
	pathAttributes1 := createPathAttr([]uint32{65000, 65100, 65200}, "192.168.50.1")
	nlri1 := []*bgp.IPAddrPrefix{
		bgp.NewIPAddrPrefix(24, "10.10.10.0"),
		bgp.NewIPAddrPrefix(24, "20.20.20.0"),
		bgp.NewIPAddrPrefix(24, "30.30.30.0"),
		bgp.NewIPAddrPrefix(24, "40.40.40.0"),
		bgp.NewIPAddrPrefix(24, "50.50.50.0")}
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nlri1)

	// path2
	pathAttributes2 := createPathAttr([]uint32{65000, 65100, 65300}, "192.168.50.1")
	nlri2 := []*bgp.IPAddrPrefix{
		bgp.NewIPAddrPrefix(24, "11.11.11.0"),
		bgp.NewIPAddrPrefix(24, "22.22.22.0"),
		bgp.NewIPAddrPrefix(24, "33.33.33.0"),
		bgp.NewIPAddrPrefix(24, "44.44.44.0"),
		bgp.NewIPAddrPrefix(24, "55.55.55.0")}
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri2)

	// path3
	pathAttributes3 := createPathAttr([]uint32{65000, 65100, 65400}, "192.168.50.1")
	nlri3 := []*bgp.IPAddrPrefix{
		bgp.NewIPAddrPrefix(24, "77.77.77.0"),
		bgp.NewIPAddrPrefix(24, "88.88.88.0"),
	}
	bgpMessage3 := bgp.NewBGPUpdateMessage(nil, pathAttributes3, nlri3)

	// path4
	pathAttributes4 := createPathAttr([]uint32{65000, 65100, 65500}, "192.168.50.1")
	nlri4 := []*bgp.IPAddrPrefix{
		bgp.NewIPAddrPrefix(24, "99.99.99.0"),
	}
	bgpMessage4 := bgp.NewBGPUpdateMessage(nil, pathAttributes4, nlri4)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 5, len(pList))
	for _, p := range pList {
		assert.Equal(t, p.IsWithdraw, false)
	}
	assert.NoError(t, err)

	checkBestPathResult(bgp.RF_IPv4_UC, "10.10.10.0/24", "192.168.50.1", pList[0], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv4_UC, "20.20.20.0/24", "192.168.50.1", pList[1], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv4_UC, "30.30.30.0/24", "192.168.50.1", pList[2], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv4_UC, "40.40.40.0/24", "192.168.50.1", pList[3], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv4_UC, "50.50.50.0/24", "192.168.50.1", pList[4], bgpMessage1)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage2)
	assert.Equal(t, 5, len(pList))
	for _, p := range pList {
		assert.Equal(t, p.IsWithdraw, false)
	}
	assert.NoError(t, err)

	checkBestPathResult(bgp.RF_IPv4_UC, "11.11.11.0/24", "192.168.50.1", pList[0], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv4_UC, "22.22.22.0/24", "192.168.50.1", pList[1], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv4_UC, "33.33.33.0/24", "192.168.50.1", pList[2], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv4_UC, "44.44.44.0/24", "192.168.50.1", pList[3], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv4_UC, "55.55.55.0/24", "192.168.50.1", pList[4], bgpMessage2)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage3)
	assert.Equal(t, 2, len(pList))
	for _, p := range pList {
		assert.Equal(t, p.IsWithdraw, false)
	}
	assert.NoError(t, err)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage4)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check table
	table := tm.Tables[bgp.RF_IPv4_UC]
	assert.Equal(t, 13, len(table.GetDestinations()))

}

// check multiple paths
func TestProcessBGPUpdate_multiple_nlri_ipv6(t *testing.T) {

	tm := NewTableManager(logger, []bgp.RouteFamily{bgp.RF_IPv6_UC})

	createPathAttr := func(aspaths []uint32) []bgp.PathAttributeInterface {
		origin := bgp.NewPathAttributeOrigin(0)
		aspath := createAsPathAttribute(aspaths)
		med := bgp.NewPathAttributeMultiExitDisc(100)
		localpref := bgp.NewPathAttributeLocalPref(100)
		pathAttr := []bgp.PathAttributeInterface{
			origin, aspath, med, localpref,
		}
		return pathAttr
	}

	// check PathAttribute
	checkPattr := func(expected *bgp.BGPMessage, actual *Path) {
		pathAttributes := expected.Body.(*bgp.BGPUpdate).PathAttributes
		pathNexthop := pathAttributes[4]
		attr := actual.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
		expectedNexthopAttr := attr.(*bgp.PathAttributeMpReachNLRI)
		assert.Equal(t, expectedNexthopAttr, pathNexthop)

		expectedOrigin := pathAttributes[0]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN)
		pathOrigin := attr.(*bgp.PathAttributeOrigin)
		assert.Equal(t, expectedOrigin, pathOrigin)

		expectedAsPath := pathAttributes[1]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
		pathAspath := attr.(*bgp.PathAttributeAsPath)
		assert.Equal(t, expectedAsPath, pathAspath)

		expectedMed := pathAttributes[2]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		pathMed := attr.(*bgp.PathAttributeMultiExitDisc)
		assert.Equal(t, expectedMed, pathMed)

		expectedLocalpref := pathAttributes[3]
		attr = actual.getPathAttr(bgp.BGP_ATTR_TYPE_LOCAL_PREF)
		localpref := attr.(*bgp.PathAttributeLocalPref)
		assert.Equal(t, expectedLocalpref, localpref)

		// check PathAttribute length
		assert.Equal(t, len(pathAttributes), len(actual.GetPathAttrs()))

	}

	checkBestPathResult := func(rf bgp.RouteFamily, prefix, nexthop string, p *Path, m *bgp.BGPMessage) {
		assert.Equal(t, p.GetRouteFamily(), rf)
		checkPattr(m, p)
		// check destination
		assert.Equal(t, prefix, p.GetPrefix())
		// check nexthop
		assert.Equal(t, nexthop, p.GetNexthop().String())
	}

	// path1
	pathAttributes1 := createPathAttr([]uint32{65000, 65100, 65200})
	mpreach1 := createMpReach("2001::192:168:50:1", []bgp.AddrPrefixInterface{
		bgp.NewIPv6AddrPrefix(64, "2001:123:1210:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1220:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1230:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1240:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1250:11::"),
	})
	pathAttributes1 = append(pathAttributes1, mpreach1)
	bgpMessage1 := bgp.NewBGPUpdateMessage(nil, pathAttributes1, nil)

	// path2
	pathAttributes2 := createPathAttr([]uint32{65000, 65100, 65300})
	mpreach2 := createMpReach("2001::192:168:50:1", []bgp.AddrPrefixInterface{
		bgp.NewIPv6AddrPrefix(64, "2001:123:1211:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1222:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1233:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1244:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1255:11::"),
	})
	pathAttributes2 = append(pathAttributes2, mpreach2)
	bgpMessage2 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nil)

	// path3
	pathAttributes3 := createPathAttr([]uint32{65000, 65100, 65400})
	mpreach3 := createMpReach("2001::192:168:50:1", []bgp.AddrPrefixInterface{
		bgp.NewIPv6AddrPrefix(64, "2001:123:1277:11::"),
		bgp.NewIPv6AddrPrefix(64, "2001:123:1288:11::"),
	})
	pathAttributes3 = append(pathAttributes3, mpreach3)
	bgpMessage3 := bgp.NewBGPUpdateMessage(nil, pathAttributes3, nil)

	// path4
	pathAttributes4 := createPathAttr([]uint32{65000, 65100, 65500})
	mpreach4 := createMpReach("2001::192:168:50:1", []bgp.AddrPrefixInterface{
		bgp.NewIPv6AddrPrefix(64, "2001:123:1299:11::"),
	})
	pathAttributes4 = append(pathAttributes4, mpreach4)
	bgpMessage4 := bgp.NewBGPUpdateMessage(nil, pathAttributes4, nil)

	peer1 := peerR1()
	pList, err := tm.ProcessUpdate(peer1, bgpMessage1)
	assert.Equal(t, 5, len(pList))
	for _, p := range pList {
		assert.Equal(t, p.IsWithdraw, false)
	}
	assert.NoError(t, err)

	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1210:11::/64", "2001::192:168:50:1", pList[0], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1220:11::/64", "2001::192:168:50:1", pList[1], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1230:11::/64", "2001::192:168:50:1", pList[2], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1240:11::/64", "2001::192:168:50:1", pList[3], bgpMessage1)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1250:11::/64", "2001::192:168:50:1", pList[4], bgpMessage1)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage2)
	assert.Equal(t, 5, len(pList))
	for _, p := range pList {
		assert.Equal(t, p.IsWithdraw, false)
	}
	assert.NoError(t, err)

	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1211:11::/64", "2001::192:168:50:1", pList[0], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1222:11::/64", "2001::192:168:50:1", pList[1], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1233:11::/64", "2001::192:168:50:1", pList[2], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1244:11::/64", "2001::192:168:50:1", pList[3], bgpMessage2)
	checkBestPathResult(bgp.RF_IPv6_UC, "2001:123:1255:11::/64", "2001::192:168:50:1", pList[4], bgpMessage2)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage3)
	assert.Equal(t, 2, len(pList))
	for _, p := range pList {
		assert.Equal(t, p.IsWithdraw, false)
	}
	assert.NoError(t, err)

	pList, err = tm.ProcessUpdate(peer1, bgpMessage4)
	assert.Equal(t, 1, len(pList))
	assert.Equal(t, pList[0].IsWithdraw, false)
	assert.NoError(t, err)

	// check table
	table := tm.Tables[bgp.RF_IPv6_UC]
	assert.Equal(t, 13, len(table.GetDestinations()))

}

func TestProcessBGPUpdate_Timestamp(t *testing.T) {
	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65000})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("192.168.50.1")
	med := bgp.NewPathAttributeMultiExitDisc(0)

	pathAttributes := []bgp.PathAttributeInterface{
		origin,
		aspath,
		nexthop,
		med,
	}

	nlri := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}

	adjRib := NewAdjRib(logger, []bgp.RouteFamily{bgp.RF_IPv4_UC, bgp.RF_IPv6_UC})
	m1 := bgp.NewBGPUpdateMessage(nil, pathAttributes, nlri)
	peer := peerR1()
	pList1 := ProcessMessage(m1, peer, time.Now())
	path1 := pList1[0]
	t1 := path1.GetTimestamp()
	adjRib.Update(pList1)

	m2 := bgp.NewBGPUpdateMessage(nil, pathAttributes, nlri)
	pList2 := ProcessMessage(m2, peer, time.Now())
	//path2 := pList2[0].(*IPv4Path)
	//t2 = path2.timestamp
	adjRib.Update(pList2)

	inList := adjRib.PathList([]bgp.RouteFamily{bgp.RF_IPv4_UC}, false)
	assert.Equal(t, len(inList), 1)
	assert.Equal(t, inList[0].GetTimestamp(), t1)

	med2 := bgp.NewPathAttributeMultiExitDisc(1)
	pathAttributes2 := []bgp.PathAttributeInterface{
		origin,
		aspath,
		nexthop,
		med2,
	}

	m3 := bgp.NewBGPUpdateMessage(nil, pathAttributes2, nlri)
	pList3 := ProcessMessage(m3, peer, time.Now())
	t3 := pList3[0].GetTimestamp()
	adjRib.Update(pList3)

	inList = adjRib.PathList([]bgp.RouteFamily{bgp.RF_IPv4_UC}, false)
	assert.Equal(t, len(inList), 1)
	assert.Equal(t, inList[0].GetTimestamp(), t3)
}

func update_fromR1() *bgp.BGPMessage {

	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65000})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("192.168.50.1")
	med := bgp.NewPathAttributeMultiExitDisc(0)

	pathAttributes := []bgp.PathAttributeInterface{
		origin,
		aspath,
		nexthop,
		med,
	}

	nlri := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}

	return bgp.NewBGPUpdateMessage(nil, pathAttributes, nlri)
}

func update_fromR1_ipv6() *bgp.BGPMessage {

	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65000})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)

	mp_nlri := []bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2001:123:123:1::")}
	mp_reach := bgp.NewPathAttributeMpReachNLRI("2001::192:168:50:1", mp_nlri)
	med := bgp.NewPathAttributeMultiExitDisc(0)

	pathAttributes := []bgp.PathAttributeInterface{
		mp_reach,
		origin,
		aspath,
		med,
	}
	return bgp.NewBGPUpdateMessage(nil, pathAttributes, nil)
}

func update_fromR2() *bgp.BGPMessage {

	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65100})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("192.168.100.1")
	med := bgp.NewPathAttributeMultiExitDisc(100)

	pathAttributes := []bgp.PathAttributeInterface{
		origin,
		aspath,
		nexthop,
		med,
	}

	nlri := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "20.20.20.0")}
	return bgp.NewBGPUpdateMessage(nil, pathAttributes, nlri)
}

func update_fromR2_ipv6() *bgp.BGPMessage {

	origin := bgp.NewPathAttributeOrigin(0)
	aspath := createAsPathAttribute([]uint32{65100})
	mp_reach := createMpReach("2001::192:168:100:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2002:223:123:1::")})
	med := bgp.NewPathAttributeMultiExitDisc(100)

	pathAttributes := []bgp.PathAttributeInterface{
		mp_reach,
		origin,
		aspath,
		med,
	}
	return bgp.NewBGPUpdateMessage(nil, pathAttributes, nil)
}

func createAsPathAttribute(ases []uint32) *bgp.PathAttributeAsPath {
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, ases)}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	return aspath
}

func createMpReach(nexthop string, prefix []bgp.AddrPrefixInterface) *bgp.PathAttributeMpReachNLRI {
	mp_reach := bgp.NewPathAttributeMpReachNLRI(nexthop, prefix)
	return mp_reach
}

func createMpUNReach(nlri string, len uint8) *bgp.PathAttributeMpUnreachNLRI {
	mp_nlri := []bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(len, nlri)}
	mp_unreach := bgp.NewPathAttributeMpUnreachNLRI(mp_nlri)
	return mp_unreach
}

func update_fromR2viaR1() *bgp.BGPMessage {

	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65000, 65100})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("192.168.50.1")

	pathAttributes := []bgp.PathAttributeInterface{
		origin,
		aspath,
		nexthop,
	}

	nlri := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "20.20.20.0")}
	return bgp.NewBGPUpdateMessage(nil, pathAttributes, nlri)
}

func update_fromR2viaR1_ipv6() *bgp.BGPMessage {

	origin := bgp.NewPathAttributeOrigin(0)
	aspath := createAsPathAttribute([]uint32{65000, 65100})
	mp_reach := createMpReach("2001::192:168:50:1",
		[]bgp.AddrPrefixInterface{bgp.NewIPv6AddrPrefix(64, "2002:223:123:1::")})
	med := bgp.NewPathAttributeMultiExitDisc(100)

	pathAttributes := []bgp.PathAttributeInterface{
		mp_reach,
		origin,
		aspath,
		med,
	}
	return bgp.NewBGPUpdateMessage(nil, pathAttributes, nil)

}