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To view the BGP configuration, enter show config in CONFIGURATION ROUTER BGP mode. To view
the BGP status, use the show ip bgp summary command in EXEC Privilege mode. The first example
shows the summary with a 2-byte AS number displayed (in bold); the second example shows that the
summary with a 4-byte AS number using the
show ip bgp summary command (displays a 4–byte AS
number in bold).
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#
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, the system uses the highest IP address of the Loopback interfaces configured.
Because Loopback interfaces are virtual, they cannot go down, thus preventing changes in the router ID.
If you do not configure Loopback interfaces, 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 command in EXEC Privilege
mode as shown in the first example. For BGP neighbor configuration information, use the show
running-config bgp
command in EXEC Privilege mode as shown in the second example.
NOTE: The showconfig command in CONFIGURATION ROUTER BGP mode gives the same
information as the
show running-config bgp command.
The following example displays two neighbors: one is an external internal BGP neighbor 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 (shown in bold).
170
Border Gateway Protocol IPv4 (BGPv4)