H3C Technologies H3C SR8800 - Manual (Page 400)

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Troubleshooting IPv6 BGP configuration
IPv6 BGP peer relationship not established
Symptom
Display BGP peer information by using the display bgp ipv6 peer command. The state of the connection
to the peer cannot become established.
Analysis
To become IPv6 BGP peers, any two routers must establish a TCP session using port 179 and exchange
open messages successfully.
Solution
1. Use the display current-configuration command to check that the peer’s AS number is correct.
2. Use the display bgp ipv6 peer command to check that the peer’s IPv6 address is correct.
3. If a loopback interface is used, check that the loopback interface is specified with the peer
connect-interface command.
4. If the peer is not directly connected, check that the peer ebgp-max-hop command is configured.
5. Check 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 ipv6 status command to check the TCP connection.
8. Check whether an ACL for disabling TCP port 179 is configured.