Configuring BGP Confederation
Configuration:
R1
!
interface Loopback0
ip address 199.199.199.199 255.255.255.0
!
interface Serial1/0
ip address 192.168.31.2 255.255.255.0
router bgp 20
no synchronization
bgp log-neighbor-changes
network 199.199.199.0
neighbor 192.168.31.1 remote-as 1 Ã peering with R1 and R2’s Confederation ID
no auto-summary
!
ip forward-protocol
nd
ip route 0.0.0.0
0.0.0.0 192.168.31.1
R2
!
interface Serial1/0
ip address 192.168.31.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 10.0.0.2 255.255.255.0
serial restart-delay 0
!
router bgp 65002-Ã R2’s sub AS
no synchronization
bgp log-neighbor-changes
bgp confederation identifier 1
bgp confederation peers 65001
network 10.0.0.0 mask 255.255.255.0
neighbor 10.0.0.3 remote-as 65001
neighbor 192.168.31.2 remote-as 20
no auto-summary
!
ip forward-protocol
nd
ip route 0.0.0.0
0.0.0.0 192.168.31.2
R3
!
interface Serial1/1
ip address 10.0.0.3 255.255.255.0
serial restart-delay 0
!
router bgp 65001Ã R3’s Sub AS
no synchronization
bgp log-neighbor-changes
bgp confederation identifier 1
bgp confederation peers 65002--- specify
confederation peers
neighbor 10.0.0.2 remote-as 65002
no auto-summary
!
ip forward-protocol
nd
ip route 0.0.0.0
0.0.0.0 10.0.0.2
Verification:
R1#show ip bgp
summary
BGP router
identifier 199.199.199.199,
local AS number 20
BGP table version
is 5, main routing table version 5
2 network entries
using 234 bytes of memory
2 path entries
using 104 bytes of memory
3/2 BGP
path/bestpath attribute entries using 372 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 734 total
bytes of memory
BGP activity 2/0
prefixes, 2/0 paths, scan interval 60 secs
Neighbor V
AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.31.1 4
1 28 27
5 0 0 00:21:05 1
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