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Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Enabling High Availability Features
Troubleshooting NSF Features
To troubleshoot the NSF feature, use the following commands in privileged EXEC configuration mode,
as needed:
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.
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.