Routing Commands
303
ProSafe Managed Switch
nsf helper disable
Use this command to disable helpful neighbor functionality for OSPF.
Note: The commands no nsf helper and nsf ietf helper disable
are functionally equivalent. The command nsf ietf helper
disable is supported solely for compatibility with other network
software CLI.
nsf [ietf] helper strict-lsa-checking
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 may introduce
forwarding loops or black holes that persist until the graceful restart completes. By exiting the
graceful restart on a topology change, a router tries to eliminate the loops or black holes as
quickly as possible by routing around the restarting router. A helpful neighbor considers a link
down with the restarting router to be a topology change, regardless of the strict LSA checking
configuration. Use this command to require that an OSPF helpful neighbor exit helper mode
whenever a topology change occurs.
no nsf [ietf] helper strict-lsa-checking
Use this command to allow OSPF to continue as a helpful neighbor in spite of topology
changes.
Format nsf [ietf] helper disable
Modes OSPF Router Configuration
Parameter Description
ietf This keyword is accepted but not required.
Default Enabled
Format nsf [ietf] helper strict-lsa-checking
Modes OSPF Router Configuration
Parameter Description
ietf This keyword is accepted but not required.
Default Enabled
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