Router Identification Designation in OSPF (168500)
The information in this article applies to:
- Microsoft Windows NT Server 4.0
- Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0
This article was previously published under Q168500 SUMMARY
Each router running Open Shortest Path First (OSPF) in an Autonomous System
(AS) is assigned a 32-bit unique identifier called a router ID. Although it
looks like an IP address, it is only used to identify the router and is not
an IP address.
MORE INFORMATION
The router ID is used to identify the router in an Autonomous System and is
advertised in the OSPF Hello packets sent between routers. Some OSPF
configuration information is determined by the highest router ID. In the
case of a tie when determining the designated router in an AS, the highest
router ID takes precedence.
Although the router need not have any relationship to IP addresses on the
router, it is generally accepted practice to make the router ID either the
highest or lowest IP address on the router. If the router ID is changed
the OSPF protocol should be reinitialized.
| Modification Type: | Major | Last Reviewed: | 8/9/2001 |
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| Keywords: | kbnetwork KB168500 |
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