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WS-C3750G-24TS ETHCNTR-3-LOOP_BACK_DETECTED PM-4-ERR_DISABLE

This is a Metro Ethernet Connection having a Switch connected between the CE and the PE.

The connectivity is as follows:

CE--Telco--Switch--PE

I am getting the following error on the Port Connected with the Telco:

Feb 20 16:43:09.424 UTC: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on GigabitEthernet1/0/11.

Feb 20 16:43:09.424 UTC: %PM-4-ERR_DISABLE: loopback error detected on Gi1/0/11, putting Gi1/0/11 in err-disable state

Error Message    ETHCNTR-3-LOOP_BACK_DETECTED:, Loop-back detected on [chars]. The port

is forced to linkdown.

Explanation    This message means that a loopback condition might be the result of a balun cable incorrectly connected into a port. On PoE switches, this message might appear when a device that can be powered by either a PoE switch port or by AC power is not being powered by an external AC power source and is connected to a port that has been configured with the power inline never interface configuration command. [chars] is the port.

Recommended Action    On non-PoE switches, check the cables. If a balun cable is connected and the loopback condition is desired, no action is required. Otherwise, connect the correct cable, and then enable the port up by entering the no shutdown interface configuration command. On PoE switches, remove the device or configure the port by entering the power inline auto, the shutdown, and the no shutdown interface configuration commands.

Error Message    PM-4-ERR_DISABLE: [chars] error detected on [chars], putting [chars]

in err-disable state.

Explanation    This message means that the port manager detected a misconfiguration or misbehavior and placed the interface in an error-disabled state. A recovery is attempted after the configured retry time (the default is 5 minutes). On PoE switches, this message might appear when a device that can be powered by either a PoE switch port or by AC power is not being powered by an external AC power source and is connected to a port that has been configured with the power inline never interface configuration command. [chars] is the port where the threshold was exceeded. The first [chars] is the error, and the second and third [chars] are the affected interfaces.

Recommended Action    On non-PoE switches, copy the error message exactly as it appears on the console or in the system log. Research and attempt to resolve the error by using the Output Interpreter. Enter the show tech-support user EXEC command to gather data that might help identify the nature of the error. Use the Bug Toolkit to look for similar reported problems. On PoE switches, remove the device or configure the port by entering the power inline auto, the shutdown, and the no shutdown interface configuration commands. If you still require assistance, open a case with the TAC, or contact your Cisco technical support representative, and provide the representative with the gathered information. For more information about the online tools and about contacting Cisco, see the "Error Message Traceback Reports" section in Chapter 1 of the system message guide.

1 REPLY
New Member

Re: WS-C3750G-24TS ETHCNTR-3-LOOP_BACK_DETECTED PM-4-ERR_DISABLE

Take a look at bug...CSCea46385

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