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Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 2 Configuring Basic Interface Parameters
Configuring the Basic Interface Parameters
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:
• 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.
SUMMARY STEPS
1. test cable-diagnostics tdr interface number
2. show interface number cable-diagnostics-tdr
DETAILED STEPS
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
Command Purpose
Step 1
test cable-diagnostics tdr interface number
Example:
switch# test cable-diagnostics tdr
interface ethernet 7/1
Starts the TDR test on the specified interface. You
must have previously run the shutdown command
on the interface.
Step 2
show interface number cable-diagnostics-tdr
Example:
switch(config)# show interface ethernet 7/1
cable-diagnostics-tdr
Shows the TDR test results for the specified
interface.
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