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ospf router-id
Configures an OSPF router ID.
Syntax: [no] ospf router-id ip-address
id-number
IP address that identifies this OSPF router.
Description: Router ID is the tie-breaker for OSPF path selection. The path selection process uses a variety of metrics to select a route. If all other metrics (accessibility, administrative weight, local preference, etc.) are equal, OSPF determines the router ID using the following priority:
- Use the address configured by the ospf router-id command
- Use the address of the loopback interface with the highest IP address
- Use the highest IP address of any interface
- If no interface exists, set the router-ID to 0.0.0.0
If no OSPF router ID is explicitly configured, OSPF computes the router-ID based on the items 2, 3, and 4 and restarts OSPF (if the process is enabled and router-ID has changed).
WARNING The ospf router-id command causes the OSPF process to restart using the new router-ID (if the processes are enabled and router-ID has changed).
Use ospf router-id ip-address command to set the OSPF router ID for the system.
Use the no ospf router-id to configure the OSPF router ID as the default value (address of the loopback 0 interface).
Factory Default: Loopback 0 interface address.
Command Mode: Router configuration.
Example: In the following example, the ospf router-id ip-address command configures the router ID as 5.1.1.49, and the show ip ospf command displays the setting:
router(config-router)#ospf router-id 5.1.1.49
router(config-router)#end
router#show ip ospf
OSPF is running, process id: 2, router id: 5.1.1.49
Number of areas: 1, normal: 1, stub: 0
Maximum paths per route: 1
Area: 0.0.0.0
Number of interfaces in this area is 4
Type of authentication none
SPF algorithm has run 9 times
SPF interval 5 seconds
Related Commands: router ospf
show ip ospf
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Copyright © 2004
Avici Systems Inc.
Avici® and TSR®
is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are
trademarks of Avici Systems Inc.
Source
File Name: ospf.fm
HTML File Name: ospf20.html
Last Updated: 05/10/04 at 16:34:58