40-19
Switch(config)#ip community-list com2 permit 90
Switch(config)#exit
Switch#clear ip bgp 16.1.1.6 soft out
40.3.4 Examples 4: configure BGP confederation
The following is the configuration of an AS. As the picture illustrated, SwitchB and SwitchC establish IBGP
connection. SwitchD is affiliated to AS 20.SwitchB and SwitchC establish EBGP of inner AS confederation.
AS10 and AS20 form AS confederation with the AS number AS200; SwitchA belongs to AS100, SwitchB may
create EBGP connection by AS200.
Figure 40-2 Confederation configuring topology
The configurations are as following:
SwitchA:
SwitchA(config)#router bgp 100
SwitchA(config-router-bgp)#neighbor 11.1.1.2 remote-as 200
SwitchB:
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