Cisco Catalyst 3750-X

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Catalyst 3750-X, 3750-E, 3560-X, and 3560-E Switch System Message Guide
OL-9772-05
Chapter 2 Message and Recovery Procedures
ETHCNTR Messages
Error Message ETHCNTR-3-LOOP_BACK_DETECTED:, Loop-back detected on [chars]. The port
is forced to linkdown.
Explanation A keepalive packet is looped back to the 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-disabled, it does not
resolve the cause of the problem and can affect network stability. See CSCea46385 for more
information.
Error Message ETHCNTR-3-NO_HARDWARE_RESOURCES: Not enough hardware resources.
Shutting down [chars].
Explanation There are too many VLANs and routed ports (if the switch supports routed ports)
configured. [chars] is the short interface name, such as Gi1/0/1 on a Catalyst
3750-E switch, or the
VLAN name, such as VLAN0002.
Recommended Action Reduce the total number of VLANs and routed ports to less than 1023. To
preserve configuration and connections across reboots, save the configuration.
Error Message ETHCNTR-3-SNAP_FORWARDING_UNSUPPORTED: IPv4/IPv6 SNAP forwarding will
be disabled because switch [dec] does not support this feature.
Explanation A switch that is being added to the stack does not support the forwarding of IP Version 4
(IPv4) and IP Version 6 (IPv6) frames with Subnetwork Access Protocol (SNAP) encapsulation. If
this occurs, forwarding of IPv4 and IPv6 frames is disabled in the switch stack. [dec] is the stack
member number.
Recommended Action Replace the stack member with a switch that supports forwarding of IPv4 and
IPv6 frames with SNAP encapsulation.