% TDR test is not supported

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Aug 27th, 2008
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Is there any reason why this command wouldn't work on a 3560 ip-base switch?


C3560-24#test cable-diagnostics tdr interface fastEthernet 0/10

% TDR test is not supported on interface Fa0/10



Here is the config of the interface.

interface FastEthernet0/10

switchport trunk encapsulation dot1q

switchport trunk native vlan 7

switchport mode trunk

speed 100

duplex full

srr-queue bandwidth limit 50

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glen.grant Wed, 08/27/2008 - 14:42
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You can use the TDR feature to diagnose and resolve cabling problems. TDR is supported only on copper Ethernet 10/100/1000 ports. It is not supported on 10/100 ports or small form-factor pluggable (SFP) module ports. For more information about TDR, refer to the software configuration guide for this release.

thefranmaneds Wed, 08/27/2008 - 16:11
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That is funny I have it running on another 3560 on a FastE port. The main differece is that the switch it works on is running EMI and not SMI




Port Name Status Vlan Duplex Speed Type

Fa0/8 connected trunk a-full a-100 10/100BaseTX



#test cable-diagnostics tdr interface fastEthernet 0/8

Link state may be affected during TDR test

TDR test started on interface Fa0/8

A TDR test can take a few seconds to run on an interface

Use 'show cable-diagnostics tdr' to read the TDR results.




sh cable-diagnostics tdr interface fastEthernet 0/8

TDR test last run on: March 04 14:54:44


Interface Speed Local pair Pair length Remote pair Pair status

--------- ----- ---------- ------------------ ----------- --------------------

Fa0/8 100M Pair A 4 +/- 15 meters Pair B Normal

Pair B 4 +/- 15 meters Pair A Normal

Pair C N/A Pair D Not Supported

Pair D N/A Pair C Not Supported



Why would it give you the option for FastE if you can't use it?


#test cable-diagnostics tdr interface ?

FastEthernet FastEthernet IEEE 802.3

GigabitEthernet GigabitEthernet IEEE 802.3z

Mark Yeates Wed, 08/27/2008 - 14:47
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Kevin,


TDR is supported only on 10/100/1000 copper Ethernet ports. It is not supported on 10/100 ports or on SFP module ports.


HTH,

Mark

thefranmaneds Wed, 12/10/2008 - 09:20
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What is odd is that does work on 10/100 ports. I though it was the different between SI and EI code but it doesn't seem to be. The switch it is working on is a 3560-8 and we also have a 2960 that it is working on.



thefranmaneds Wed, 12/10/2008 - 09:28
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2960

Understanding TDR


You can use the Time Domain Reflector (TDR) feature to diagnose and resolve cabling problems. When running TDR, a local device sends a signal through a cable and compares the reflected signal to the initial signal.


TDR is supported only on 10/100 and 10/100/1000 copper Ethernet ports. It is not supported on SFP module ports.


http://www.ciscosystems.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_fx/configuration/guide/swtrbl.html



3560

Understanding TDR


In Cisco IOS Release 12.2(25)SE or later, you can use the Time Domain Reflector (TDR) feature to diagnose and resolve cabling problems. When running TDR, a local device sends a signal through a cable and compares the reflected signal to the initial signal.


TDR is supported only on 10/100/1000 copper Ethernet ports. It is not supported on 10/100 ports or on SFP module ports.



http://www.ciscosystems.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_sed/configuration/guide/swtrbl.html#wp1186482







I'd guess the 3560-8 isn't in the same boat as the rest of the 3560's. It is probably more of a 2960-8 then a 3560.

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