980 Configuring OSPF and OSPFv3
nsf [ietf] [planned-only] Enable a graceful restart of OSPF. 
•
ietf
 — This keyword is used to distinguish the IETF 
standard implementation of graceful restart from other 
implementations.  Since the IETF implementation is 
the only one supported, this keyword is optional.
•
planned-only
 — This keyword indicates that OSPF 
should only perform a graceful restart when the restart is 
planned (i.e., when the restart is a result of the initiate 
failover command).
Command Purpose