F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100

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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. If the peer ttl-security hops command is configured, verify that the command is configured on the
peer, and the hop-count values configured on them are greater than the number of hops between
them.
6. Verify that a valid route to the peer is available.
7. Use the ping command to verify the connectivity to the peer.
8. Use the display tcp ipv6 status command to verify the TCP connection.
9. Verify whether an ACL is applied to disable TCP port 179.