Netgear M4100-26G CLI Manual - Page 305
nsf, nsf restart-interval, no nsf
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ProSafe M4100 and M7100 Managed Switches avoiding announcement of a topology change 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 planned or unplanned restarts, or both. A planned restart is initiated by the operator through the management command initiate failover. The operator might initiate a failover to take the management unit out of service (for example, to address a partial hardware failure), to correct faulty system behavior that 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 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] OSPF Router Configuration Parameter ietf planned-only Description This keyword is accepted but not required. This optional keyword indicates that OSPF should perform only a graceful restart when the restart is planned (that is, when the restart is a result of the initiate failover command). no nsf Use this command to disable graceful restart for all restarts. Format Modes no nsf OSPF Router Configuration nsf restart-interval Use this command to configure the number of seconds that the restarting router asks its neighbors to wait before exiting helper mode. This is called 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 Routing Commands 305