Border Gateway Protocol - CCIE Routing and Switching Exam Certification Guide - page 453

and G are in AS 10, the peer confederation is AS 20. Router B is in AS 20 and its peer
confederation is AS 10, as shown in Example 9-16.

Routers C and D are part of AS 10 and peer with each other and with routers A and G. Routers
E and F are part of AS 20 and peer with each other and with Router B.
Example 9-16 BGP Confederation Example

!The configuration of Router A is:
interface loopback 0
ip address 1.1.1.1 255.255.255.255
!
router bgp 10
bgp confederation identifier 100
bgp confederation peers 20
neighbor 1.1.1.2 remote-as 20
neighbor 1.1.1.7 remote-as 10
neighbor 1.1.1.3 remote-as 10
neighbor 1.1.1.4 remote-as 10

bgp confederation identifier

!The configuration of Router B is:
interface loopback 0
ip address 1.1.1.2 255.255.255.255
!
router bgp 20
bgp confederation identifier 100
bgp confederation peers 10
neighbor 1.1.1.1 remote-as 10
neighbor 1.1.1.5 remote-as 20
neighbor 1.1.1.6 remote-as 20

!The configuration of Router C is:
interface loopback 0
ip address 1.1.1.3 255.255.255.255
!
router bgp 10
neighbor 1.1.1.1 remote-as 10
neighbor 1.1.1.7 remote-as 10
neighbor 1.1.1.4 remote-as 10

!The configuration of Router D is:
interface loopback 0
ip address 1.1.1.4 255.255.255.255
!
router bgp 10
neighbor 1.1.1.1 remote-as 10
neighbor 1.1.1.7 remote-as 10
neighbor 1.1.1.3 remote-as 10

!The configuration of Router E is:
interface loopback 0
ip address 1.1.1.5 255.255.255.255

continues