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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter
test cable-diagnostics tdr
test cable-diagnostics tdr
To run the Time Domain Reflector (TDR) feature on an interface, use the test cable-diagnostics tdr
command in privileged EXEC mode.
test cable-diagnostics tdr interface interface-id
Note TDR is supported only on GigabitEthernet 10/100/100 ports.
Defaults 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 or 10/100/1000 ports. It is not supported on small form-factor pluggable (SFP) module
ports or on 10 Gigabit Ethernet 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 gigabitethernet0/2
TDR test started on interface Gi0/2
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 gigabitethernet0/3
TDR test on Gi0/9 will affect link state and traffic
TDR test started on interface Gi0/3
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 Specifies the interface on which to run TDR.
Release Modification
12.2(52)EY This command was introduced.
Command Description
show cable-diagnostics tdr Displays the TDR results.
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