Netgear M7300-24XF (XSM7224S) - ProSAFE 24-port, 10 Gigabit Stackable L2+ Managed Switch Leaflet

forward packets through the restarting router. The restarting router relearns the network 
topology from its helpful neighbors. 

Graceful restart implements both the restarting router and helpful neighbor features 
described in RFC 3623.

This command enables OSPF graceful restart. The 

 parameter is used to distinguish the 

IETF standard implementation of graceful restart from other implementations. Since the IETF 
implementation is not the only one supported, this parameter is optional. The 

 

parameter indicates that OSPF performs a graceful restart only when the restart is planned 
(that is, when the restart results from the 

initiate failover

 command).

nsf [ ietf ] [ planned-only ]

This command disables OSPF graceful restart. 

no nsf [ ietf ] 

This command allows OSPF to act as a helpful neighbor for a restarting router. The 

 parameter indicates that OSPF should only help a restarting router 

performing a planned restart.

The grace LSA announcing the graceful restart includes the reason for the restart. Reasons 1 
(software restart) and 2 (software reload/upgrade) are considered planned restarts. Reasons 
0 (unknown) and 3 (switch to redundant control processor) are considered unplanned 
restarts. 

nsf helper [ planned-only ] 

disabled

OSPFv3 Router Configuration mode

OSPFv3 Router Configuration mode

OSPF acts as a helpful neighbor for both planned and unplanned restarts

OSPFv3 Router Configuration mode