Reference Guide
202 | Border Gateway Protocol IPv4 (BGPv4)
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Enter show config in CONFIGURATION ROUTER BGP mode to view the BGP configuration. Use the
show ip bgp summary command in EXEC Privilege mode to view the BGP status. The following
example shows the summary with a 2-Byte AS Number displayed; the example in Example: show ip bgp
summary (4-Byte AS Number displayed) shows the summary with a 4-Byte AS Number displayed.
Example: show ip bgp summary (2-Byte AS Number displayed)
R2#show ip bgp summary
BGP router identifier 192.168.10.2, local AS number 65123
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#
Example: show ip bgp summary (4-Byte AS Number displayed)
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#
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.