Reference Guide

182 | Border Gateway Protocol
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Figure 8-13. Command example: show ip bgp summary (4-Byte AS Number displayed)
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.
R2#show ip bgp summary
BGP router identifier 192.168.10.2, local AS number 48735.59224
BGP table version is 1, main routing table version 1
1 network entrie(s) using 132 bytes of memory
1 paths using 72 bytes of memory
BGP-RIB over all using 73 bytes of memory
1 BGP path attribute entrie(s) using 72 bytes of memory
1 BGP AS-PATH entrie(s) using 47 bytes of memory
5 neighbor(s) using 23520 bytes of memory
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/Pfx
10.10.21.1 65123 0 0 0 0 0 never Active
10.10.32.3 65123 0 0 0 0 0 never Active
100.10.92.9 65192 0 0 0 0 0 never Active
192.168.10.1 65123 0 0 0 0 0 never Active
192.168.12.2 65123 0 0 0 0 0 never Active
R2#
4-Byte AS Number