H3C Technologies H3C S12500 Series Switches - Manual (Page 409)

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Solution
1. Use the display current-configuration configuration bgp command to verify that the peer's AS
number is correct.
2. Use the display bgp ipv6 peer command to verify that the peer's IPv6 address is correct.
3. If a loopback interface is used, verify that the loopback interface is specified with the peer
connect-interface command.
4. If the peer is not directly connected, verify that the peer ebgp-max-hop command is configured.
5. Verify that a valid route to the peer is available.
6. Use the ping command to test the connectivity to the peer.
7. Use the display tcp ipv6 status command to verify the TCP connection is normal.
8. Verify that no ACL is configured to disable TCP port 179.