CCNP TSHOOT 6.0 - The Cisco Learning Network

CCNPv6 TSHOOT
the IP address that has been configured as the neighbor IP address on the peer router. For neighbors that are
directly connected on an interface, the correct source address is automatically used. For neighbors that are not
directly connected, the appropriate source IP address for the session to a neighbor might need to be selected with
the neighbor ip-address update-source interface-id command.
Verify the BGP Neighbor Table
R1#show ip bgp
BGP table version is 2, local router ID is 192.168.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 0.0.0.0 192.168.2.1 0 0 65502 i
R1#show ip bgp summary
BGP router identifier 192.168.1.1, local AS number 65501
BGP table version is 3, main routing table version 3
2 network entries using 264 bytes of memory
2 path entries using 104 bytes of memory
3/2 BGP path/bestpath attribute entries using 504 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory
BGP using 928 total bytes of memory
BGP activity 2/0 prefixes, 2/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.2.1 4 65502 36 36 3 0 0 00:33:01 1
To verify that all expected neighbor relationships are operational, you can display a summary of the BGP
neighbor table using the show ip bgp summary command. This command lists important BGP parameters,
such as the AS number and router ID, statistics about the memory consumption of the various BGP data
structures, and a brief overview of the configured neighbors and their state.
For each neighbor, the configured IP address and AS of the neighbor are listed. The Up/Down column lists the
time that has elapsed since the last state change. For a neighbor that is currently up, it lists the time elapsed
since the session was established. For a neighbor that is down, it lists the time elapsed since the session was
lost.
The most important column to verify the operational state of the neighbor is State/PfxRcd. This column can
display the following values:
• Idle – Indicates that there is no session with the peer, and the router is not currently attempting to
establish a session with the peer. The router is ready to accept incoming sessions.
• Idle (Admin) – Indicates that the session has been administratively shut down with the neighbor
ip-address shutdown command.
• Active – The router is actively trying to open a TCP session with the neighbor. If it does not succeed
in establishing the session, the router toggles between the Idle and Active states
• Open Sent – An Open message has been sent to the neighboring router containing the router ID, AS
number, BGP version, hold timer, and capabilities.
• Open Confirm – An Open message from the neighbor has been received, the parameters in the
message have been processed and accepted, and a hello message has been sent to acknowledge
the acceptance of the neighbor’s Open message.
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