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ProSafe Managed Switch
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.
nsf (OSPFv3)
This command enables OSPF graceful restart. The ietf 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
planned-only
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).
Default
Format nsf [ ietf ] [ planned-only ]
Mode
no nsf [ietf] (OSPFv3)
This command disables OSPF graceful restart.
Format no nsf [ ietf ]
Mode
nsf helper (OSPFv3)
This command allows OSPF to act as a helpful neighbor for a restarting router. The
planned-only parameter indicates that OSPF should only help a restarting router
performing a planned restart.
Retransmit
Interval
The configured retransmit interval for the OSPFV3 virtual interface.
Transit Delay
The configured transit delay for the OSPFV3 virtual interface.
disabled
OSPFv3 Router Configuration mode
OSPFv3 Router Configuration mode
Term Definition