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Enabling High Availability Features
Troubleshooting NSF Features
To troubleshoot the NSF feature, use the following commands in privileged EXEC configuration mode,
as needed:
Command
Router# clear cef epoch
Router# debug isis nsf [detail]
Router# debug ospf nsf [detail]
Router# show cef nsf
Router# show cef state
Router# show clns neighbors
Router> show ip bgp
Router# show ip bgp neighbor
Router# show ip cef
Router> show ip ospf
Router> show ip ospf neighbor [detail]
Router# show isis database [detail]
Router# show isis nsf
NSF Troubleshooting Tips
For the following troubleshooting situations, try the corresponding recommended action to resolve the
problem.
Symptom
Symptom
Symptom
switchover.
Route Switch Processor (RSP8) Installation and Configuration Guide
58
Purpose
Begins a new epoch and increments the epoch number for a CEF table.
Displays information about the IS-IS state during a Cisco NSF restart.
Displays debugging messages related to OSPF Cisco NSF commands.
Displays the current NSF state of CEF on both the active and standby RSPs.
Displays the state of CEF on a networking device.
Display both end-system (ES) and intermediate system (IS) neighbors.
Displays entries in the BGP routing table.
Displays information about the TCP and BGP connections to neighbor
devices.
Displays entries in the FIB that are unresolved, or displays a FIB summary.
Displays general information about OSPF routing processes.
Displays OSPF-neighbor information on a per-interface basis.
Displays the IS-IS link-state database.
Displays the current state information regarding IS-IS Cisco NSF.
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.
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.
The system loses, or appears to lose, adjacencies with network peers following a stateful
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.
OL-4920-02
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