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Important Points to Remember
tdr-cable-test
c e s
Syntax
Parameters
Defaults
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626
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Interfaces
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.
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tdr-cable-test
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show tdr
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The interface and port must be enabled (configured—see the
TDR. An error message is generated if you have not enabled the interface.
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The interface on the far-end device must be shut down before running TDR.
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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.
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When testing between two devices, do not run the test on both ends of the cable.
Test the condition of copper cables on 100/1000 Base-T modules.
tdr-cable-test interface
interface
No default behavior or setting
EXEC
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
The interface must be enabled to run the test or an error message is generated:
FTOS#tdr-cable-test gigabitethernet 5/2
%Error: Interface is disabled GI 5/2
The C-Series and S-Series do not generate log messages is generated when the link flaps down/up
during TDR tests. The E-series, does produce these log messages.
show tdr
GigabitEthernet
Enter the keyword
information for the 100/1000 Ethernet interface.
Display the results of the TDR test.
interface
command) before running
followed by the slot/port
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