BGP联邦实验
R1
在
as 100
里，
R2R3R4
在公有
as234
里，（
R2R3
在私有
as65523
里，
R4
在私有
as65504
里）
R5
在
as500
里。
实验步骤：
Setp1
：底层配置，并且将
as234
的
IGP
部署好，需要通过
lookback
接口来建立邻居关系，所以在
R2R3R4
上起
lo0 2.2.2 .2 lo0 3.3.3.3 lo0 4.4.4.4
并且要宣告在
eigrp
里
，底层
as234
跑
eigrp
。
Setp2
：部署
as234
联邦内
IBGP
的关系，在建立联邦
BGP
关系时，一定先做
bgp confederation identifier
此命令，因为
R3
有一个联邦内
EBGP
邻居，所以在
R3
上要用命令
bgp confederation peers 65504
来指定联邦
EBGP
对等的
as
号码。
Setp3
：建立联邦内
EBGP
关系需要注意
bgp confederation peers
命令。因为联邦内
EBGP
也是
EBGP
关系，所以需要
nei 4.4.4 .4 ebgp-multihop nei 3.3.3.3 ebgp-multihop
Setp4
：创建
lookback
接口在
R1
上用于验证路由的传递。
R1(config)#int s2/1
R1(config-if)#ip add 12.0.0 .1 255.255.255.0
R1(config-if)#no shu
R1(config-if)#do ping 12.0.0 .2
Sending 5, 100-byte ICMP Echos to 12.0.0 .2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/75/104 ms
R1(config)#int lo0
R1(config-if)#ip add 1.1.1 .1 255.255.255.0
R1(config)#router bgp 100
R1(config-router)#bgp router-id 1.1.1 .1
R1(config-router)#no syn
R1(config-router)#no au
R1(config-router)#nei 12.0.0 .2 remote-as 234
R1(config-router)#network 1.1.1 .0 mask 255.255.255.0
*Jul 28 14:30:41.763: %BGP-5-ADJCHANGE: neighbor 12.0.0 .2 Up
R2(config)#int s2/1
R2(config-if)#ip add 12.0.0 .2 255.255.255.0
R2(config-if)#no shu
R2(config-if)#int s2/2
R2(config-if)#ip add 23.0.0 .2 255.255.255.0
R2(config-if)#no shu
R2(config-if)#do ping 23.0.0 .3
Sending 5, 100-byte ICMP Echos to 23.0.0 .3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/48/136 ms
R2(config-if)#int lo0
R2(config-if)#ip add 2.2.2 .2 255.255.255.0
R2(config)#router eigrp 90
R2(config-router)#net 12.0.0 .0 0.0.0.255
R2(config-router)#net 23.0.0 .0 0.0.0.255
R2(config-router)#net 2.2.2 .0 0.0.0.255
R2(config-router)#no auto-summary
R2(config-router)#do sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF , IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
D 34.0.0.0 [90/2681856] vi a 23.0.0 .3, 00:01:14, Serial2/2
2.0.0 .0/24 is subnetted, 1 subnets
C 2.2.2 .0 is directly connected, Loopback0
3.0.0 .0/24 is subnetted, 1 subnets
D 3.3.3 .0 [90/2297856] vi a 23.0.0 .3, 00:01:14, Serial2/2
4.0.0 .0/24 is subnetted, 1 subnets
D 4.4.4 .0 [90/2809856] vi a 23.0.0 .3, 00:00:34, Serial2/2
23.0.0 .0/24 is subnetted, 1 subnets
C 23.0.0 .0 is directly connected, Serial2/2
12.0.0 .0/24 is subnetted, 1 subnets
C 12.0.0 .0 is directly connected, Serial2/1
45.0.0.0/24 is subnetted, 1 subnets
D 45.0.0.0 [90/3193856] vi a 23.0.0 .3, 00:00:35, Serial2/2
R2(config)#router bgp 65523
R2(config-router)#bgp router-id 2.2.2 .2
R2(config-router)#no syn
R2(config-router)#no au
R2(config-router)#bgp confederation identifier 234
R2(config-router)#nei 3.3.3 .3 remote-as 65523
R2(config-router)#nei 3.3.3 .3 update-source lo0
R2(config-router)#nei 12.0.0 .1 remote-as 100
*Jul 28 14:27:28.387: %BGP-5-ADJCHANGE: neighbor 3.3.3 .3 Up
R2(config-router)#
*Jul 28 14:30:35.935: %BGP-5-ADJCHANGE: neighbor 12.0.0 .1 Up
R2(config-router)#do sh ip bgp sum
BGP router identifier 2.2.2 .2, local AS number 65523
BGP table version is 2, main routing table version 2
1 network entries using 101 bytes of memory
1 path entries using 48 bytes of memory
1 BGP path attribute entries using 60 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 233 total bytes of memory
BGP activity 1/0 prefixes, 1/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
3.3.3
.3 4 65523 7 8 2 0 0 00:03:51 0
12.0.0
.1 4 100 5 4 2 0 0 00:00:43 1
R2(config-router)#do sh ip bgp
BGP table version is 2, local router ID is 2.2.2 .2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1 .0/24 12.0.0 .1 0 0 100 i
R3(config)#int s2/1
R3(config-if)#ip add 23.0.0 .3 255.255.255.0
R3(config-if)#no shu
R3(config-if)#int s2/2
R3(config-if)#ip add 34.0.0.3 255.255.255.0
R3(config-if)#no shu
R3(config-if)#do ping 34.0.0.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 34.0.0.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/79/164 ms
R3(config-if)#int lo0
R3(config-if)#ip add 3.3.3 .3 255.255.255.0
R3(config-if)#exit
R3(config)#router eigrp 90
R3(config-router)#net 23.0.0 .0 0.0.0.255
*Jul 28 14:22:14.235: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 90: Neighbor 23.0.0 .2 (Serial2/1) is up: new adjacency
R3(config-router)#net 34.0.0.0 0.0.0 .255
R3(config-router)#net 3.3.3 .0 0.0.0.255
R3(config-router)#no auto-summary
R3(config-router)#exit
R3(config)#router bgp 65523
R3(config-router)#bgp router-id 3.3.3 .3
R3(config-router)#no syn
R3(config-router)#no au
R3(config-router)#bgp confederation identifier 234
R3(config-router)#nei 2.2.2 .2 remote-as 65523
R3(config-router)#nei 2.2.2 .2 update-source lo0
R3(config-router)#bgp confederation peers 65504
R3(config-router)#nei 4.4.4 .4 remote-as 65504
R3(config-router)#nei 4.4.4 .4 update-source lo0
R3(config-router)#nei 4.4.4 .4 ebgp-multihop
*Jul 28 14:29:34.595: %BGP-5-ADJCHANGE: neighbor 4.4.4 .4 Up
R3(config-router)#do sh ip bgp sum
BGP router identifier 3.3.3 .3, local AS number 65523
BGP table version is 2, main routing table version 2
1 network entries using 101 bytes of memory
1 path entries using 48 bytes of memory
1 BGP path attribute entries using 60 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 233 total bytes of memory
BGP activity 1/0 prefixes, 1/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
2.2.2
.2 4 65523 9 8 2 0 0 00:04:03 1
4.4.4
.4 4 65504 5 6 2 0 0 00:01:56 0
R3(config-router)#do sh ip bgp
BGP table version is 2, local router ID is 3.3.3 .3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i 1.1.1 .0/24 12.0.0 .1 0 100 0 100 i
R4(config)#int s2/1
R4(config-if)#ip add 34.0.0.4 255.255.255.0
R4(config-if)#no shu
R4(config-if)#int s2/2
R4(config-if)#ip add 45.0.0.4 255.255.255.0
R4(config-if)#no shu
R4(config-if)#do ping 45.0.0.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 45.0.0.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/76/156 ms
R4(config-if)#int lo0
R4(config-if)#ip add 4.4.4 .4 255.255.255.0
R4(config-if)#exit
R4(config)#router eigrp 90
R4(config-router)#net 34.0.0.0 0.0.0 .255
*Jul 28 14:22:56.055: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 90: Neighbor 34.0.0.3 (Serial2/1) is up: new adjacency
R4(config-router)#net 45.0.0.0 0.0.0 .255
R4(config-router)#net 4.4.4 .0 0.0.0.255
R4(config-router)#no auto-summary
R4(config-router)#do sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF , IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
C 34.0.0.0 is directly connected, Serial2/1
2.0.0 .0/24 is subnetted, 1 subnets
D 2.2.2 .0 [90/2809856] via 34.0.0.3, 00:01:27, Serial2/1
3.0.0 .0/24 is subnetted, 1 subnets
D 3.3.3 .0 [90/2297856] via 34.0.0.3, 00:01:27, Serial2/1
4.0.0 .0/24 is subnetted, 1 subnets
C 4.4.4 .0 is directly connected, Loopback0
23.0.0 .0/24 is subnetted, 1 subnets
D 23.0.0 .0 [90/2681856] via 34.0.0.3, 00:01:27, Serial2/1
12.0.0 .0/24 is subnetted, 1 subnets
D 12.0.0 .0 [90/3193856] via 34.0.0.3, 00:01:28, Serial2/1
45.0.0.0/24 is subnetted, 1 subnets
C 45.0.0.0 is directly connected, Serial2/2
R4(config)#router bgp 65504
R4(config-router)#bgp router-id 4.4.4 .4
R4(config-router)#no syn
R4(config-router)#no au
R4(config-router)#bgp confederation identifier 234
R4(config-router)#bgp confederation peers 65523
R4(config-router)#nei 3.3.3 .3 remote-as 65523
R4(config-router)#nei 3.3.3 .3 update-source lo0
R4(config-router)#nei 3.3.3 .3 ebgp-multihop
*Jul 28 14:29:40.867: %BGP-5-ADJCHANGE: neighbor 3.3.3 .3 Up
R4(config-router)#nei 45.0.0.5 remote-as 500
*Jul 28 14:31:27.767: %BGP-5-ADJCHANGE: neighbor 45.0.0.5 Up
R4(config-router)#do sh ip bgp sum
BGP router identifier 4.4.4 .4, local AS number 65504
BGP table version is 2, main routing table version 2
1 network entries using 101 bytes of memory
1 path entries using 48 bytes of memory
1 BGP path attribute entries using 60 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 233 total bytes of memory
BGP activity 1/0 prefixes, 1/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
3.3.3
.3 4 65523 7 6 2 0 0 00:02:04 1
45.0.0.5 4 500 4 5 2 0 0 00:00:17 0
R4(config-router)#do sh ip bgp
BGP table version is 2, local router ID is 4.4.4 .4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1 .0/24 12.0.0 .1 0 100 0 (65523) 100 i
R5(config)#int s2/2
R5(config-if)#ip add 45.0.0.5 255.255.255.0
R5(config-if)#no shu
R5(config-if)#exit
R5(config)#router bgp 500
R5(config-router)#bgp router-id 5.5.5 .5
R5(config-router)#nei 45.0.0.4 remote-as 234
*Jul 28 14:31:24.999: %BGP-5-ADJCHANGE: neighbor 45.0.0.4 Up
R5(config-router)#do sh ip bgp
BGP table version is 2, local router ID is 5.5.5 .5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1 .0/24 45.0.0.4 0 234 100 i