Netgear XSM4348CS CLI Manual Software Version 12.x - Page 880

M4300 Intelligent Edge Series Fully Managed Stackable Switches advertise to the rest of the network that they have full adjacencies with the restarting router, thereby avoiding announcement of a topology change and and the potential for flooding of LSAs and shortest-path-first (SPF) runs (which determine OSPF routes). Helpful neighbors continue to forward packets through the restarting router. The restarting router relearns the network topology from its helpful neighbors. Graceful restart can be enabled for either planned or unplanned restarts, or both. You can initiate a planned restart through the management command initiate failover. You can initiate a failover in order to take the management unit out of service (for example, to address a partial hardware failure), to correct faulty system behavior which cannot be corrected through less severe management actions, or other reasons. An unplanned restart is an unexpected failover caused by a fatal hardware failure of the management unit or a software hang or crash on the management unit. nsf (OSPFv3) Use this command to enable the OSPF graceful restart functionality on an interface. To disable graceful restart, use the no form of the command. Default Format Modes Disabled nsf [ietf] [planned-only] Router OSPFv3 Config Parameter ietf planned-only Description This keyword is accepted but not required. This optional keyword indicates that OSPF should only perform a graceful restart when the restart is planned (that is, when the restart is a result of the initiate failover command). no nsf (OSPFv3) Use this command to disable graceful restart for all restarts. Format Modes no nsf [ietf] [planned-only] Router OSPFv3 Config nsf restart-interval (OSPFv3) Use this command to configure the number of seconds that the restarting router asks its neighbors to wait before exiting helper mode. This is referred to as the grace period. The restarting router includes the grace period in its grace LSAs. For planned restarts (using the initiate failover command), the grace LSAs are sent prior to restarting the management unit, whereas for unplanned restarts, they are sent after reboot begins. The grace period must be set long enough to allow the restarting router to reestablish all of its adjacencies and complete a full database exchange with each of those neighbors. For the seconds argument, a valid value is in the range from 0 to 1800 seconds. IPv6 Commands 880 CLI Command Reference Manual