Cisco Cisco IOS Software Release 12.0(12)S

This feature module describes the Frame Relay Switching Diagnostics and Troubleshooting feature. It 
includes information on the benefits of the new feature, supported platforms, related documents, and 
more.

This document includes the following sections:

The Frame Relay Switching Diagnostics and Troubleshooting feature enhances Frame Relay switching 
functionality by providing tools to diagnose problems in switched Frame Relay networks. 

Before this feature was introduced, the show frame-relay pvc command displayed the number of packets 
dropped from switched permanent virtual circuits (PVCs). With the Frame Relay Switching Diagnostics 
and Troubleshooting feature, the show frame-relay pvc command has been enhanced so that in addition to 
the number of packets dropped, it now displays detailed reasons why packets were dropped. The command 
has also been enhanced to display the local PVC status, the Network-to-Network (NNI) PVC status, and the 
overall PVC status. 

If a problem is observed, the new debug frame-relay switching command can be used to display the 
status of packets on switched PVCs at regular intervals. This new debug command displays information 
such as the number of packets that were switched, why packets were dropped, and changes in status of 
physical links and PVCs. Debug information is displayed only when there has been a change from one 
configured interval to the next.