host1(config-router)#bgp router-id 10.25.1.1
â– The new BGP identifier is used in open messages sent after you issue the
command. To use the new BGP identifier for sessions already in the established
state, you must use the clear ip bgp command to perform a hard clear.
â– Use the no version to restore the router ID as the BGP identifier.
â– See bgp router-id
Configuring Neighbors
Use the neighbor remote-as command to create a BGP peering session with a given
BGP peer—identified by its IP address—in a given AS. Note that the neighbor
remote-as command must be issued on both routers on either side of a BGP session
for the BGP session to become established.
Consider the simple network structure shown in Figure 10 on page 25. Routers LA
and SanJose are IBGP peers within AS 873. Router SanJose has an EBGP peer, router
Boston, in AS 17.
Figure 10: Configuring Neighbors
The following commands configure router Boston with router SanJose as a peer:
host1(config)#router bgp 17
host1(config-router)#neighbor 10.5.5.4 remote-as 873
The following commands configure router SanJose with router LA and router Boston
as peers:
host2(config)#router bgp 873
host2(config-router)#neighbor 10.2.2.3 remote-as 873
host2(config-router)#neighbor 10.5.5.1 remote-as 17
The following commands configure router LA with router SanJose as a peer:
host3(config)#router bgp 873
host3(config-router)#neighbor 10.2.2.4 remote-as 873
neighbor remote-as
Basic Configuration â– 25
Chapter 1: Configuring BGP Routing
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