Technical Tip: BGP router-id selection criteria on FortiGate

Below are the criteria for BGP Router ID selection.

1. Use the address configured manually as the router-id with the below command.

config router bgp

    set router-id 2.2.2.2

end

2. It uses the Loopback interface address with the highest IP address if the router-id is not configured manually.
3. It uses the highest IP address of the interface if the loopback interface is not configured.

Related articles:
Technical Tip: How to check the BGP router-id using the CLI
Troubleshooting Tip: BGP router-id not updating