Reference Guide

140 | Border Gateway Protocol
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For the router’s identifier, FTOS uses the highest IP address of the Loopback interfaces configured. Since
Loopback interfaces are virtual, they cannot go down, thus preventing changes in the router ID. If no
Loopback interfaces are configured, the highest IP address of any interface is used as the router ID.
To view the status of BGP neighbors, use the
show ip bgp neighbors (Figure 8-14) command in EXEC
Privilege mode. For BGP neighbor configuration information, use the
show running-config bgp
command in EXEC Privilege mode (Figure 8-15). Note that the
showconfig command in
CONFIGURATION ROUTER BGP mode gives the same information as thew
show running-config bgp.
Figure 8-14 displays two neighbors, one is an external and the second one is an internal BGP neighbor. The
first line of the output for each neighbor displays the AS number and states whether the link is an external
or internal.
The third line of the
show ip bgp neighbors output contains the BGP State. If anything other than
ESTABLISHED is listed, the neighbor is not exchanging information and routes. For more details on using
the
show ip bgp neighbors command, refer to the FTOS Command Line Interface Reference.