3Com 5500G-EI Command Reference Guide - Page 216

216 CHAPTER 6: USING ROUTING PROTOCOL COMMANDS View System View Parameter router_id Enter the router ID as a 32-bit unsigned integer. Description Using the router id command, you can configure the ID of a router running the OSPF protocol. Using the undo router id command, you can cancel the router ID that has been set. By default, if the LoopBack interface address exists, the system chooses the LoopBack address with the greatest IP address value as the router ID; if no LoopBack interface is configured, then the address of the physical interface with the greatest IP address value will be the router ID. The router ID is a 32-bit unsigned integer that uniquely identifies a router in an OSPF system. You can specify the ID for a router. If a router ID isn't specified, the router automatically selects one of the configured IP address as the router ID. If an IP address is not configured for any interface, the router ID must be configured in OSPF view. Otherwise, OSPF protocol cannot be enabled. When the router ID is configured manually, the IDs of any two routers cannot be the same in the autonomous system. So, the IP address of one interface can be selected as the router ID. The modified router ID will not be valid unless OSPF is re-enabled. Related command: ospf. Example To set the router ID to 10.1.1.3., enter the following: system-view System View: return to User View with Ctrl+Z. [SW5500]router id 10.1.1.3 silent-interface Syntax silent-interface silent-interface_type silent-interface_number undo silent-interface silent-interface_type silent-interface_number View OSPF View Parameter silent-interface_type Enter the interface type silent-interface_number Enter the interface number.