Cisco Systems RSP8 manual Troubleshooting NSF Features, NSF Troubleshooting Tips

Enabling High Availability Features

Troubleshooting NSF Features

To troubleshoot the NSF feature, use the following commands in privileged EXEC configuration mode, as needed:

Command	Purpose
Router# clear cef epoch	Begins a new epoch and increments the epoch number for a CEF table.
Router# debug isis nsf [detail]	Displays information about the IS-IS state during a Cisco NSF restart.
Router# debug ospf nsf [detail]	Displays debugging messages related to OSPF Cisco NSF commands.
Router# show cef nsf	Displays the current NSF state of CEF on both the active and standby RSPs.
Router# show cef state	Displays the state of CEF on a networking device.
Router# show clns neighbors	Display both end-system (ES) and intermediate system (IS) neighbors.
Router> show ip bgp	Displays entries in the BGP routing table.
Router# show ip bgp neighbor	Displays information about the TCP and BGP connections to neighbor
	devices.
Router# show ip cef	Displays entries in the FIB that are unresolved, or displays a FIB summary.
Router> show ip ospf	Displays general information about OSPF routing processes.
Router> show ip ospf neighbor [detail]	Displays OSPF-neighbor information on a per-interface basis.
Router# show isis database [detail]	Displays the IS-IS link-state database.
Router# show isis nsf	Displays the current state information regarding IS-IS Cisco NSF.

NSF Troubleshooting Tips

For the following troubleshooting situations, try the corresponding recommended action to resolve the problem.

Symptom The system displays FIB errors.

Recommended Action Use the show cef state command to verify that distributed CEF switching is enabled on your platform. To enable distributed CEF, use the ip cef distributed command in global configuration mode on the active RSP.

Symptom Cannot determine if an OSPF neighbor is NSF-aware.

Recommended Action To verify whether an OSPF neighbor device is NSF-aware and if NSF is operating between them, use the show ip ospf neighbor detail command.

Symptom The system loses, or appears to lose, adjacencies with network peers following a stateful switchover.

Recommended Action Use the show clns neighbors detail command to find any neighbors that do not have “NSF capable” and make sure that they are running NSF-aware images. Additionally, for ISIS, the standby RSP must be stable for 5 minutes (default) before another restart can be initiated. Use the nsf interval command to reset the restart period.

Route Switch Processor (RSP8) Installation and Configuration Guide

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