Figure 42: A Confederation of Subautonomous Systems
The following commands partially configure router Salem:
host1(config)#router bgp 64720
host1(config-router)#bgp confederation identifier 29
host1(config-router)#bgp confederation peers 64721 64722
host1(config-router)#neighbor 10.2.25.4 remote-as 64720
host1(config-router)#neighbor 10.2.25.8 remote-as 64721
host1(config-router)#neighbor 10.2.25.2 remote-as 325
The bgp confederation identifier command establishes router Salem as a member of
Confederation 29. The bgp confederation peers command specifies that sub-AS 64721
and sub-AS 64722 are members of the same confederation as the sub-AS that includes
router Salem. The neighbor remote-as commands specify the IBGP connection with a
neighbor in sub-AS 64720 and the EBGP connections with neighbors in sub-AS 64721
and outside the confederation in AS 325.
Similarly, the following commands partially configure router Harvard:
host2(config)#router bgp 64721
host2(config-router)#bgp confederation identifier 29
host2(config-router)#bgp confederation peers 64720 64722
host2(config-router)#neighbor 10.2.25.7 remote-as 64720
From router Newport’s perspective, router Salem is simply a member of AS 29:
host3(config)#router bgp 325
host3(config-router)#neighbor 10.2.25.6 remote-as 29
143Copyright © 2010, Juniper Networks, Inc.
Chapter 1: Configuring BGP Routing
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