Test Cable-Diagnostics Tdr - Cisco Catalyst 3750 Command Reference Manual

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test cable-diagnostics tdr

Use the test cable-diagnostics tdr privileged EXEC command on the switch stack or on a standalone

switch to run the Time Domain Reflector (TDR) feature on an interface.

Syntax Description

interface-id

There is no default.

Command Modes

Privileged EXEC

Command History

Usage Guidelines

You can use the TDR feature to diagnose and resolve cabling problems. TDR is supported only on copper

Ethernet 10/100/1000 ports. It is not supported on 10/100 ports or small form-factor pluggable (SFP)

module ports. For more information about TDR, see the software configuration guide for this release.

After you run TDR by using the test cable-diagnostics tdr interface interface-id command, use the

show cable-diagnostics tdr interface interface-id privileged EXEC command to display the results.

This example shows how to run TDR on an interface:

Switch# test cable-diagnostics tdr interface gigabitethernet1/0/2

TDR test started on interface Gi1/0/2

A TDR test can take a few seconds to run on an interface

Use 'show cable-diagnostics tdr' to read the TDR results.

If you enter the test cable-diagnostics tdr interface interface-id command on an interface that has a

link status of up and a speed of 10 or 100 Mbps, these messages appear:

Switch# test cable-diagnostics tdr interface gigabitethernet1/0/3

TDR test on Gi1/0/9 will affect link state and traffic

TDR test started on interface Gi1/0/3

A TDR test can take a few seconds to run on an interface

Use 'show cable-diagnostics tdr' to read the TDR results.

Related Commands

show cable-diagnostics tdr

Catalyst 3750 Switch Command Reference

test cable-diagnostics tdr interface interface-id

Specify the interface on which to run TDR.

Modification

This command was introduced.

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

Displays the TDR results.