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### Instruction:
ISIS-4-NSF_CHKPT_TABLE_FAIL
### Response:
(Severity: 4), (Category: ROUTING), (Description: An unexpected error occurred whilst IS-IS was accessing the specified checkpoint table. If this error occurs during an NSF Cisco restart then that NSF restart may be aborted in favour of a traditional restart. If this error occurs during normal operation then the relevant checkpoint table may not be correct, and a subsequent NSF restart may not succeed. The error may be caused by a low memory condition or through programming error.), (Recommended Action: Reduce other system activity to ease memory demands. If conditions warrant, upgrade to a larger memory configuration.. *RECUR*.)
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