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Catalyst 3750 Switch Command Reference
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Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
test cable-diagnostics tdr
test cable-diagnostics tdr
Use the test cable-diagnostics tdr privileged EXEC command to run the Time Domain Reflector (TDR)
feature on an interface.
test cable-diagnostics tdr interface interface-id
Syntax Description
Defaults There is no default.
Command Modes Privileged EXEC
Command History
Usage Guidelines TDR is supported only on 10/100/100 copper Ethernet ports. It is not supported on 10/100 ports,
10-Gigabit module ports, or on 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.
Examples 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 Mb/s, 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
interface-id Specify the interface on which to run TDR.
Release Modification
12.1(19)EA1 This command was introduced.
Command Description
show cable-diagnostics tdr Displays the TDR results.
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