Troubleshooting Bgp; Bgp Peer Relationship Not Established - HPE FlexNetwork HSR6800 Configuration Manual

Troubleshooting BGP

BGP peer relationship not established

Symptom
Display BGP peer information by using the display bgp peer command. The state of the connection
to a peer cannot become established.
Analysis
To become BGP peers, any two routers must establish a TCP session using port 179 and exchange
Open messages successfully.
Solution
Use the display current-configuration command to verify that the peer's AS number is
1.
correct.
Use the display bgp peer command to verify that the peer's IP address is correct.
2.
If a loopback interface is used, verify that the loopback interface is specified with the peer
3.
connect-interface command.
If the peer is a non-direct EBGP peer, verify that the peer ebgp-max-hop command is
4.
configured.
If the peer ttl-security hops command is configured, verify that the command is configured on
5.
the peer, and the hop-count values configured on them are greater than the number of hops
between them.
Verify that a valid route to the peer is available.
6.
Use the ping command to check the connectivity to the peer.
7.
Use the display tcp status command to check the TCP connection.
8.
Check whether an ACL disabling TCP port 179 is configured.
9.
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