Performing Tdr Cable Diagnostics - Cisco 7206 - VXR Router Configuration Manual

Chapter 2 Configuring Basic Interface Parameters
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m

Performing TDR Cable Diagnostics

You can perform cable diagnostics without the use of expensive third party equipment. Each port on the
line card can independently detect cabling issues and report them to the switch software using TDR
diagnostics.
BEFORE YOU BEGIN
The TDR test guidelines are as follows:
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•
•
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SUMMARY STEPS
1.
2.
DETAILED STEPS
Command
Step 1
test cable-diagnostics tdr interface number
Example:
switch# test cable-diagnostics tdr
interface ethernet 7/1
Step 2
show interface number cable-diagnostics-tdr
Example:
switch(config)# show interface ethernet 7/1
cable-diagnostics-tdr
This example shows how to perform a TDR test on a specific interface. In this example, ethernet 3/1 has
a missing cable, and ethernet 3/12 is a good cable and connection.
switch(config)# interface ethernet 3/1-12
switch(config-if-range)# shutdown
switch# test cable-diagnostics tdr interface ethernet 3/1
switch# test cable-diagnostics tdr interface ethernet 3/12
switch# show interface ethernet 3/1 cable-diagnostics-tdr
OL-23435-03
TDR can test cables up to a maximum length of 115 meters.
Do not start the test at the same time on both ends of the cable. Starting the test at both ends of the
cable at the same time can lead to false test results.
Do not change the port configuration during any cable diagnostics test. This action may result in
incorrect test results.
The all ports in the associated port group must be shut down before running the TDR test.
test cable-diagnostics tdr interface number
show interface number cable-diagnostics-tdr
Purpose
Starts the TDR test on the specified interface. You
must have previously run the shutdown command
on the interface.
Shows the TDR test results for the specified
interface.
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
Configuring the Basic Interface Parameters
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