Reference Guide

640 | Interfaces
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Time Domain Reflectometer (TDR)
c e s
TDR is useful for troubleshooting an interface that is not establishing a link; either it is
flapping or not coming up at all. TDR detects open or short conditions of copper cables on
100/1000 Base-T modules.
• tdr-cable-test
• show tdr
Important Points to Remember
• The interface and port must be enabled (configured— the interface command)
before running TDR. An error message is generated if you have not enabled the
interface.
• The interface on the far-end device must be shut down before running TDR.
• Since TDR is an intrusive test on an interface that is not establishing a link, do
not run TDR on an interface that is passing traffic.
• When testing between two devices, do not run the test on both ends of the cable.
tdr-cable-test
c e s
Test the condition of copper cables on 100/1000 Base-T modules.
Syntax tdr-cable-test interface
Parameters
Defaults
No default behavior or setting
Command Modes
EXEC
Command
History
Usage
Information
The interface must be enabled to run the test or an error message is generated:
interface
Enter the keyword GigabitEthernet followed by the slot/port
information for the 100/1000 Ethernet interface.
Version 8.3.7.0 Introduced on S4810
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.7.1.0 Introduced on S-Series
Version 7.6.1.0 Introduced on C-Series
Version 6.1.1.0 Introduced on E-Series