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Can you detect wiring issues (xover vs straight) via IOS?

Folks, given two switchports from different switches connected to each other, is there any way to detect pins/wiring is wrong based on output of 'show controller' or another IOS command?

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Hall of Fame Super Gold

Re: Can you detect wiring issues (xover vs straight) via IOS?

Depending on the model of the appliance, you can also use the Time Delay Reflectometer (TDR) cable test.

test cable-diagnostics tdr command reference

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_19_ea1/command/reference/cli2.html#wp2253269

Hope this works.

5 REPLIES

Re: Can you detect wiring issues (xover vs straight) via IOS?

wiring / pins wrong can be detected in the show ip interface brief. If an interface shows down / down, that means you have a cabling issue.

If the link shows up, it means layer 1 is OK.

Community Member

Re: Can you detect wiring issues (xover vs straight) via IOS?

Well, in the case today I witnessed that the logic "interface down/down = layer 1 issue" did not work. It appeared as :

FastEthernet3/2 is up, line protocol is down (notconnect)

and the thing was definitely a bad cable.

Re: Can you detect wiring issues (xover vs straight) via IOS?

interesting i've never seen that before. what version of code are you running?

Hall of Fame Super Gold

Re: Can you detect wiring issues (xover vs straight) via IOS?

Depending on the model of the appliance, you can also use the Time Delay Reflectometer (TDR) cable test.

test cable-diagnostics tdr command reference

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_19_ea1/command/reference/cli2.html#wp2253269

Hope this works.

Hall of Fame Super Gold

Re: Can you detect wiring issues (xover vs straight) via IOS?

Thanks for the rating.

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