3-24
Catalyst 3750, 3560, 3550, 2975, 2970, and 2960 Switch System Message Guide
OL-8551-04
Chapter 3 Message and Recovery Proced ures
DWL Messages
Error Message DTP-5-NONTRUNKPORTON: Port [chars] has become non-trunk.
Explanation The interface changed from a trunk port to an access port. [chars] is the interface that
changed.
Recommended Action This message is provided for information only.
Error Message DTP-5-TRUNKPORTCHG: Port [chars] has changed from [chars] trunk to
[chars] trunk.
Explanation The encapsulation type of the trunk port has changed. The first [chars] is the interface,
the second is the original encapsulation type, and the third [chars] is the new encapsulation type.
Recommended Action This message is provided for information only.
Error Message DTP-5-TRUNKPORTON: Port [chars] has become [chars] trunk.
Explanation The interface has changed from an access port to a trunk port. The first [chars] is the
interface, and the second [chars] is the encapsulation type.
Recommended Action This message is provided for information only.
DWL Messages
This section contains the down-when-looped (DWL) message. This feature disables an interface when a
loopback is detected.
Error Message DWL-3-LOOP_BACK_DETECTED: Loop-back detected on [chars].
Explanation There is a loopback on the specified port. The cause might be a Token-Ring Type-1
cable connected to the port or a misconfiguration in the network.
Recommended Action Correct the problem that is causing the loopback condition. Then enter the
shutdown interface configuration command. Then enter the no shutdown interface configuration
command to restart the port.