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OL-4923-01 B0
Configuring OSPF NSF
Note
All peer devices participating in OSPF NSF must be made OSPF NSF-aware, which happens
automatically once you install an NSF software image on the device.
To configure NSF for OSPF, use the following commands beginning in privileged EXEC mode:
Configuring IS-IS NSF
To configure NSF for IS-IS, use the following commands beginning in privileged EXEC mode:
Command
Purpose
Step 1
Router# configure terminal
Enters global configuration mode.
Step 1
Router(config)# router bgp
as-number
Enables a BGP routing process, which places the router in
router configuration mode.
Step 1
Router(config-router)# bgp
graceful-restart
Enables the BGP graceful restart capability, starting NSF for
BGP.
If you enter this command after the BGP session has been
established, you must restart the session for the capability to
be exchanged with the BGP neighbor.
Use this command on the restarting router and all of its peers.
Command
Purpose
Step 1
Router# configure terminal
Enters global configuration mode.
Step 1
Router(config)# router ospf
processID
Enables an OSPF routing process, which places the router in
router configuration mode.
Step 1
Router(config-router)# nsf
Enables NSF operations for OSPF.
Command
Purpose
Step 1
Router# configure terminal
Enters global configuration mode.
Step 1
Router(config)# router isis
[tag]
Enables an IS-IS routing process, which places
the router in router configuration mode.
Step 1
Router(config-router)# nsf [cisco | ietf]
Enables NSF operation for IS-IS.
Enter the ietf keyword to enable IS-IS in
homogeneous network where adjacencies with
networking devices supporting IETF draft-based
restartability is guaranteed.
Enter the cisco keyword to run IS-IS in
heterogeneous networks that might not have
adjacencies with NSF-aware networking
devices.