3Com S7906E Configuration Manual page 923

Analysis
To become IPv6 BGP peers, any two routers need to establish a TCP session using port 179 and
exchange open messages successfully.
Processing steps
1) Use the display current-configuration command to verify the peer's AS number.
2) Use the display bgp ipv6 peer command to verify the peer's IPv6 address.
3) If the loopback interface is used, check whether the peer connect-interface command is
configured.
4) If the peer is not directly connected, check whether the peer ebgp-max-hop command is
configured.
5) Check whether a route to the peer is available in the routing table.
6) Use the ping command to check connectivity.
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.
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