Identifying a Router Within an Autonomous System

The router ID is commonly one of the router’s defined IP addresses. Although the router ID is, by convention, formatted as an IP address, it is not required to be a configured address of the router. If you do not use the ip router-id command to assign a router ID, the router uses one of its configured IP addresses as the router ID.

ip router-id

• Use to assign a router ID—a unique identifier that IP routing protocols use to identify the router within an autonomous system.
• Example

  host1(config)#ip router-id 192.32.15.23

• Use the no version to remove the router ID assignment.
• See ip router-id

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