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Catalyst 3750-X and 3560-X Switch Command Reference
OL-29704-01
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
show cable-diagnostics tdr
This is an example of output from the show interface interface-id command when TDR is running:
Switch# show interface gigabitethernet1/0/2
gigabitethernet1/0/2 is up, line protocol is up (connected: TDR in Progress)
This is an example of output from the show cable-diagnostics tdr interface interface-id command when
TDR is not running:
Switch# show cable-diagnostics tdr interface gigabitethernet1/0/2
% TDR test was never issued on Gi1/0/2
If an interface does not support TDR, this message appears:
% TDR test is not supported on switch 1
Related Commands
Remote pair Name of the pair of wires to which the local pair is connected. TDR can learn about
the remote pair only when the cable is properly connected and the link is up.
Pair status The status of the pair of wires on which TDR is running:
• Normal—The pair of wires is properly connected.
• Not completed—The test is running and is not completed.
• Not supported—The interface does not support TDR.
• Open—The pair of wires is open.
• Shorted—The pair of wires is shorted.
• ImpedanceMis—The impedance is mismatched.
• Short/Impedance Mismatched—The impedance mismatched or the cable is short.
• InProgress—The diagnostic test is in progress
• Fail—An unknown error occurred, and the test cannot provide results.
Note If the test reports fail status, you can try to change the link status by
disconnecting and reconnecting the far end of the cable and running the test
again. The cable diagnostic test is designed to provide information about a
defective or broken cable. It cannot diagnose or report other issues.
Table 2-28 Fields Descriptions for the show cable-diagnostics tdr Command Output (continued)
Field Description
Command Description
test cable-diagnostics tdr Enables and runs TDR on an interface.
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