DELL PC6224F User Manual

OSPFv3 Commands

OSPF may act as a helpful neighbor for both planned and unplanned restarts 

Router OSPFv3 Configuration mode

The grace LSA announcing the graceful restart includes a restart reason.  

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. 
nsf ietf helper disable is functionally equivalent to no nsf helper and is 

supported solely for IS CLI compatibility.

–

Use the nsf-helper strict-lsa-checking command to require that an OSPF 

helpful neighbor exit helper mode whenever a topology change occurs.  Use 

the “no” form of this command to allow OSPF to continue as a helpful 

neighbor in spite of topology changes.

nsf [ietf ] helper strict-lsa-checking
no nsf [ietf ] helper strict-lsa-checking

• ietf —This keyword is used to distinguish the IETF standard 

implementation of graceful restart from other implementations.  Since the 

IETF implementation is the only one supported, this keyword is optional.

A helpful neighbor exits helper mode when a topology change occurs.