DELL 8132 ユーザーズマニュアル

OSPF Commands

Use the nsf-helper to allow OSPF to act as a helpful neighbor for a restarting 

router. Use the “no” form of this command to prevent OSPF from acting as a 

helpful neighbor.

nsf [ietf] helper[planned-only]
no nsf [ietf] 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 OSPF 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

2CSPC4.X8100-SWUM102.book  Page 1245  Friday, March 15, 2013  8:56 AM