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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 35 Configuring IP Unicast Routing
Configuring BGP
Use the no router bgp autonomous-system global configuration command to remove a BGP AS. Use the
no network network-number router configuration command to remove the network from the BGP table.
Use the no neighbor {ip-address | peer-group-name} remote-as number router configuration command
to remove a neighbor. Use the no neighbor {ip-address | peer-group-name} remove-private-as router
configuration command to include private AS numbers in updates to a neighbor. Use the
synchronization router configuration command to re-enable synchronization.
These examples show how to configure BGP on the routers in Figure 35-5.
Router A:
Switch(config)# router bgp 100
Switch(config-router)# neighbor 129.213.1.1 remote-as 200
Router B:
Switch(config)# router bgp 200
Switch(config-router)# neighbor 129.213.1.2 remote-as 100
Switch(config-router)# neighbor 175.220.1.2 remote-as 200
Router C:
Switch(config)# router bgp 200
Switch(config-router)# neighbor 175.220.212.1 remote-as 200
Switch(config-router)# neighbor 192.208.10.1 remote-as 300
Router D:
Switch(config)# router bgp 300
Switch(config-router)# neighbor 192.208.10.2 remote-as 200
To verify that BGP peers are running, use the show ip bgp neighbors privileged EXEC command. This
is the output of this command on Router A:
Switch# show ip bgp neighbors
Step 9
bgp fast-external-fallover (Optional) Automatically reset a BGP session when a link
between external neighbors goes down. By default, the session
is not immediately reset.
Step 10
bgp graceful-restart (Optional) Enable NSF awareness on switch. By default, NSF
awareness is disabled.
Step 11
end Return to privileged EXEC mode.
Step 12
show ip bgp network network-number
or
show ip bgp neighbor
Verify the configuration.
Verify that NSF awareness (Graceful Restart) is enabled on the
neighbor.
If NSF awareness is enabled on the switch and the neighbor,
this message appears:
Graceful Restart Capability: advertised and received
If NSF awareness is enabled on the switch, but not on the
neighbor, this message appears:
Graceful Restart Capability: advertised
Step 13
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose