Troubleshooting Guide

The following table describes the fields in the output for l2 tracemroute command for a VRF.
Parameter Description
Source Specifies the source IP address of the flow where
the multicast trace tree originates.
Group Specifies the IP address of the multicast group.
VRF Specifies the VRF.
BMAC Specifies the backbone MAC address.
B-VLAN Specifies the backbone VLAN.
I-SID Specifies the service identifier.
Using trace CFM to diagnose problems
Use the following procedure to display trace information for CFM.
About this task
Use trace to observe the status of a software module at a certain time.
For example, if you notice a CPU utilization issue (generally a sustained spike above 90%) perform
a trace of the control plane activity.
Use the trace level 120 <0–4> command to trace CFM module information, including ACLI,
instrumentation, show config, and platform dependent code. The CFM module ID is 120.
Use the trace cfm level <0–4> command to trace platform independent code and CFM
protocol code.
Caution:
Risk of traffic loss
Using the trace tool inappropriately can cause primary CPU lockup conditions, loss of access to
the device, loss of protocols, and service degradation.
Procedure
1. Enter Global Configuration mode:
enable
configure terminal
2. Clear the trace:
clear trace
3. Begin the trace operation:
trace cfm level <0-4>
Wait approximately 30 seconds, and then stop trace.
Operations and Management
January 2017 Troubleshooting 178
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