Usage 
Information
You can configure an arbitrary value in the IP address format for each router. However, each 
router ID must be unique. If you use this command on an OSPF router process, which is already 
active (that is, has neighbors), a prompt reminding you that changing the router-id brings down 
the existing OSPF adjacency. The new router ID is effective at the next reload.
Example
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#
router ospf
Enter ROUTER OSPF mode to configure an OSPF instance.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax
router ospf process-id [vrf {vrf name}]
To clear an OSPF instance, use the no router ospf process-id command.
Parameters
process-id
Enter a number for the OSPF instance. The range is 1 to 65535.
vrf name
(Optional) E-Series Only: Enter the VRF process identifier to tie the 
OSPF instance to the VRF. All network commands under this OSPF 
instance are subsequently tied to the VRF instance.
Defaults Not configured.
Command Modes CONFIGURATION
Command History
Version 9.1(0.0) Added support for OSPFv3 on the S4810 and Z9000.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 7.9.1.0 Added support for VRF.
Version 7.8.1.0 Added support for Multi-Process OSPF.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
pre-Version 
6.1.1.1
Introduced on the E-Series.
Usage 
Information
You must have an IP address assigned to an interface to enter ROUTER OSPF mode and 
configure OSPF.
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