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Catalyst 3750, 3560, 3550, 2975, 2970, and 2960 Switch System Message Guide
OL-8551-04
Chapter 3 Message and Recovery Proced ures
ETHCNTR Messages
Error Message ETHCNTR-3-LOOP_BACK_DETECTED:, Loop-back detected on [chars]. The port
is forced to linkdown.
Explanation This message occurs when a keepalive packet is looped back to th e port that sent the
keepalive. The loopback condition might be caused by a balun cable being accidentally connected
to the port, or there might be a loop in the network. [chars] is the port.
Recommended Action Examine the cables. If a balun cable is connected, and the loopback condition
is desired, no action is required. Otherwise, connect the correct cable, and bring the port up by
entering the no shutdown interface configuration command. We do not recommend using the no
keepalive interface command to disable keepalives. The cause of this network loop must be found
and corrected. Although disabling keepalives prevents the port from being error disable d, it does not
resolve the cause of the problem and can affect network stability. See CSCea46385 for more
information.
Error Message ETHCNTR-3-MOLSENDINT: Molecule send from interrupt handler
Note This message applies only to Catalyst 3550 switches.
Explanation An interrupt handler is accessing the hardware in an impermissible manner.
Recommended Action Find out more about the error by using the show tech-support privileged
EXEC command and by copying the error message exactly as it appears on the console or system
log and entering it in the Output Interpreter tool. Use the Bug Toolkit to look for similar reported
problems. For more information about these online tools and abo ut contacting Cisco, see the “Error
Message Traceback Reports” section on page 2-7 for more information.
Error Message ETHCNTR-3-NETWORK_ERROR: Frame received on queue [dec] contained
network error. Source thread [dec], source interface [chars].
Note This message applies only to Catalyst 3550 switches.
Recommended Action The frame that is stored on the swi tch has an error. The first [dec] is the ingress
queue, the second [dec] is the source thread, and [chars] is the ingress interface.
Recommended Action Copy the 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. Use the Bug Toolkit to
look for similar reported problems. If you still require assistance, open a case with the TAC, or
contact your Cisco technical support representative, and provide the representative with th e gathered
information. For more information about these online tools and about contacting Cisco, see the “Error
Message Traceback Reports” section on page 2-7.
Error Message ETHCNTR-3-NO_HARDWARE_RESOURCES: Not enough hardware resources.
Shutting down [chars].
Note This message applies only to Catalyst 3750, 3560, 2975, 2970, and 296 0 switches.