The router can obtain a new router ID only after a router ID is reconfigured for the router or an OSPF router ID is reconfigured and the OSPF process restarts.ĭescribes the link status and link cost of a router. If no loopback interface is configured, the router selects the largest IP address among other interface addresses as its router ID.Īfter the router has been running OSPF and selected its router ID, it still uses this router ID if the interface whose IP address is used as the router ID is Down or disappears (for example, the undo interface loopback loopback-number command is run) or a larger interface IP address exists.The router preferentially selects the largest IP address among loopback interface addresses as its router ID.A router selects its router ID based on the following rules: If no router ID is manually configured for a router, the router selects an interface IP address as its router ID.It is recommended that you manually configure a router ID to ensure OSPF stability.A router ID is a 32-bit unsigned integer, uniquely identifying a router in an AS.Ī router ID can be manually configured or automatically selected by a router: A router requires a router ID if it is to run OSPF.
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