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472 CHAPTER 30: CONFIGURING BGP
Figure 154 Networking diagram of configuring AS confederation
1 Configure Router A:
[RouterA] bgp 1001
[RouterA-bgp] undo synchronization
[RouterA-bgp] confederation id 100
[RouterA-bgp] confederation peer-as 1002 1003
[RouterA-bgp] peer 172.68.10.2 as-number 1002
[RouterA-bgp] peer 172.68.10.3 as-number 1003
2 Configure Router B:
[RouterB] bgp 1002
[RouterA-bgp] undo synchronization
[RouterB-bgp] confederation id 100
[RouterB-bgp] confederation peer-as 1001 1003
[RouterB-bgp] peer 172.68.10.1 as-number 1001
[RouterB-bgp] peer 172.68.10.3 as-number 1003
3 Configure Router C:
[RouterC] bgp 1003
[RouterA-bgp] undo synchronization
[RouterC-bgp] confederation id 100
[RouterC-bgp] confederation peer-as 1001 1002
[RouterC-bgp] peer 172.68.10.1 as-number 1001
[RouterC-bgp] peer 172.68.10.2 as-number 1002
[RouterC-bgp] peer 156.10.1.2 as-number 200
[RouterC-bgp] peer 172.68.1.2 as-number 1003
Configuring BGP Route
Reflector
Router B receives a BGP update message and forwards the update to Router C,
which is configured as a route reflector and has two clients: Router B and Router
D. When Router C receives routing update from Router B, it reflects the
information to Router D. Therefore, an IBGP connection is not necessary between
Router B and Router D, because Router C will reflect the information to Router D.
AS200
AS100
AS1002
AS1001
AS1003
Ethernet
172.68.10.1
172.68.10.2
172.68.10.3
172.68.1.2
172.68.1.1
156.10.1.1
156.10.1.2
Router A
Router B
Router C
Router D
Router E