58
Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Enabling High Availability Features
Troubleshooting NSF Features
Totroubleshoot 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
enabledon 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.
RecommendedAction 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 Displaysthe 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 Displaysentries 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.