Netgear M4100-50G Manuel D’Utilisation

OSPFv3 Graceful Restart Commands

The managed switch implementation of OSPFv3 supports graceful restart as specified in 
RFC 5187 and RFC 3623. Graceful restart works together with managed switch non-stop 
forwarding (nsf) to enable the hardware to continue forwarding IPv6 packets using OSPFv3 
routes while a backup unit takes over management unit responsibility. When OSPF executes 
a graceful restart, it informs its neighbors that the OSPF control plane is restarting but will be 
back shortly. Helpful neighbors continue to advertise to the network that they have full 
adjacencies with the restarting router, avoiding announcement of a topology change, and 
related events (for example, flooding of LSAs and SPF runs). Helpful neighbors continue to 
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 configured retransmit interval for the OSPFV3 virtual interface.

The configured transit delay for the OSPFV3 virtual interface.

disabled

OSPFv3 Router Configuration mode

OSPFv3 Router Configuration mode