Enabling BGP
A router ID is the unique identifier of a BGP router in an AS.
To ensure the uniqueness of a router ID and enhance availability, specify in BGP view the IP address of a local loopback interface as the router ID.
If no router ID is specified in BGP view, the global router ID is used.
To modify a non-zero router ID of BGP, use the router-id command in BGP view, rather than the router id command in system view.
If you specify a router ID in BGP view and then remove the interface that owns the router ID, the router does not select a new router ID. To select a new router ID, use the undo router-id command in BGP view.
To enable BGP:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Configure a global router ID. | router id router-id | By default, no global router ID is configured, and BGP uses the highest loopback interface IP address—if any—as the router ID. If no loopback interface IP address is available, BGP uses the highest physical interface IP address as the route ID regardless of the interface status. |
3. Enable BGP and enter BGP view or BGP-VPN instance view. |
| By default, BGP is not enabled. A router can reside in only one AS, so the router can run only one BGP process. To enter BGP-VPN instance view, the specified VPN instance must already exist and have the route distinguisher (RD) configured. For more information, see MPLS Configuration Guide. |
4. Configure the router ID. | router-id { router-id | auto-select } | By default, the global router ID is used. The auto-select keyword is supported only in BGP-VPN instance view. |