DELL 8132 ユーザーズマニュアル

OSPFv3 Commands

nsf helper[planned-only]
no nsf helper

• planned-only

 — This keyword indicates that OSPF should only help a 

restarting router performing a planned restart.

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.

2CSPC4.X8100-SWUM102.book  Page 1319  Friday, March 15, 2013  8:56 AM