Reference Guide

Open Shortest Path First (OSPFv2) | 859
Usage
Information
IS-IS is not supported on S-Series platforms.
router-id
c e s z
Use this command to configure a fixed router ID.
Syntax
router-id ip-address
To remove the fixed router ID, use the no router-id ip-address command.
Parameters
Defaults
This command has no default behavior or values.
Command Modes
ROUTER OSPF
Command
History
Example
Figure 27-2. Command Example: router-id
Usage
Information
You can configure an arbitrary value in the IP address format for each router. However, each router ID
must be unique. If this command is used on an OSPF router process, which is already active (that is,
has neighbors), a prompt reminding you that changing router-id will bring down the existing OSPF
adjacency. The new router ID is effective at the next reload
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
pre-Version 6.1.1.1 Introduced on E-Series
ip-address
Enter the router ID in the IP address format
Version 8.3.11.1 Introduced on Z9000
Version 7.8.1.0 Introduced support for Multi-Process OSPF.
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
pre-Version 6.1.1.1 Introduced on E-Series
FTOS(conf)#router ospf 100
FTOS(conf-router_ospf)#router-id 1.1.1.1
Changing router-id will bring down existing OSPF adjacency [y/n]:
FTOS(conf-router_ospf)#show config
!
router ospf 100
router-id 1.1.1.1
FTOS(conf-router_ospf)#no router-id
Changing router-id will bring down existing OSPF adjacency [y/n]:
FTOS#