To establish BGP peer relationship, a TCP session needs to be created through port 179 and the OPEN messages need to be exchanged properly. To solve the problem, you need to perform the following operations.


1. Run the display bgp peer command to check whether the AS number and IP address of peers are properly configured.
2. Use the display bgp peer command to check whether the router IDs configured on both BGP peers are conflicting.
3. If a loopback interface is used, check whether the loopback interface is set as the source interface for sending BGP packets through the peer connect-interface command.
4. If the EBGP neighbors are not directly connected physically, check whether the peer ebgp-max-hop command is configured.
5. Check whether a route to the neighbor is available in the routing table.
6. Use the ping -a source-ip-address host-address command to check whether the specified connect-interface has a reachable route to the peer.
7. Check whether the ACL that disables TCP port 179 is configured.

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