Router Ids; Important Considerations - 3Com corebuilder 3500 Implementation Manual

Hide thumbs Also See for corebuilder 3500:

Table of Contents

Router IDs

Considerations

Each router that is configured for OSPF has an OSPF router ID. The OSPF

router ID uniquely identifies the router to other routers within an

autonomous system.

The router ID determines the designated router in a broadcast network if

the priority values of the routers involved in the designated router

election are equal. In the event of a priority tie, the router with the

highest router ID is elected designated router for the area.

Three types of router identifiers, in the form of an IP address, are

Default — A unique ID that the system generates and uses as the

default router ID.

Interface — The index of an IP interface on the router.

Address — An ID that you define in the form of an IP address.

OSPF routing must be inactive before you can add or modify an OSPF

router ID. To deactivate OSPF routing, set the OSPF mode to

See the Command Reference Guide for details. After you add the router

ID, you can set the OSPF mode to

Consider the following guidelines when you configure OSPF router IDs:

For OSPF to operate correctly, the router ID must be unique for every

Choose the default setting to ensure unique router IDs.

You cannot set the router ID to either 0.0.0.0 or 255.255.255.255.

on the interface.