Netgear GSM7224P GSM5212P/GSM7212P/GSM7212F/GSM7224P CLI Manual - Page 408

ProSafe Managed Switch The grace LSA announcing the graceful restart includes the reason for the restart. Reasons 1 (software restart) and 2 (software reload/upgrade) are considered planned restarts. Reasons 0 (unknown) and 3 (switch to redundant control processor) are considered unplanned restarts. Default Format Mode OSPF acts as a helpful neighbor for both planned and unplanned restarts nsf helper [ planned-only ] OSPFv3 Router Configuration mode nsf ietf helper disable (OSPFv3) This command is functionally equivalent to no nsf helper and is supported solely for IS-CLI compatibility. Format Mode nsf ietf helper disable OSPFv3 Router Configuration mode no nsf helper (OSPFv3) This command prevents OSPF from acting as a helpful neighbor. Format Mode no nsf helper OSPFv3 Router Configuration mode nsf helper strict-lsa-checking (OSPFv3) This command requires that an OSPF helpful neighbor exit helper mode when a topology change occurs. The restarting router is unable to react to topology changes. In particular, the restarting router will not immediately update its forwarding table. Therefore, a topology change might introduce forwarding loops or black holes that persist until the graceful restart is completed. By exiting graceful restart when a topology change occurs, a router tries to eliminate the loops or black holes as quickly as possible by routing around the restarting router. 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. A helpful neighbor considers a link down with the restarting router to be a topology change, regardless of the strict LSA checking configuration. Default Format Mode A helpful neighbor exits helper mode when a topology change occurs. nsf [ietf] helper strict-lsa-checking OSPFv3 Router Configuration mode IPv6 Commands 408