Cisco Catalyst 3750-X

2-104
Catalyst 3750-X, 3750-E, 3560-X, and 3560-E Switch System Message Guide
OL-9772-05
Chapter 2 Message and Recovery Procedures
SPANTREE Messages
error in the platform-specific code, which causes it to request more or less bits than are possible.
The first [dec] is the number of bits for the port number, and the second and third [dec] describe the
valid range.
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 the gathered
information. For more information about these online tools and about contacting Cisco, see the
“Error
Message Traceback Reports” section on page 1-7.
Error Message SPANTREE-3-PORT_SELF_LOOPED: [chars] disabled.- received BPDU src mac
([enet]) same as that of interface.
Explanation A BPDU was received on the listed interface with a source MAC address that matches
the one assigned to the listed interface. This means that a port might be looped back to itself,
possibly because of an installed diagnostic cable. The interface will be administratively shut down.
[chars] is the interface that received the BPDU, and [enet] is the source MAC address.
Recommended Action Verify the interface configuration, and test any cable connected to the interface.
When the problem is resolved, re-enable the interface by entering the no shutdown interface
configuration command.
Error Message SPANTREE-3-PRESTD_NEIGH: pre-standard MST interaction not configured
([chars]).
Explanation The switch has received a prestandard MST BPDU on an interface that is not configured
to send prestandard MST BPDUs. The switch automatically adjusts its configuration on the interface
and starts sending prestandard BPDUs. However, the switch does not automatically detect all
prestandard neighbors, and we recommend that you configure the interface to send prestandard MST
BPDUs by using the spanning-tree mst pre-standard interface configuration command. This
warning message only appears once. [chars] is the interface.
Recommended Action Use the spanning-tree mst pre-standard interface configuration command on
all the interfaces to which other switches running Cisco's prestandard MST version are connected.
We recommend that you migrate all the switches in the network to the IEEE MST standard version.
Error Message SPANTREE-4-PORT_NOT_FORWARDING: [chars] [chars] [chars] [chars].
Explanation A port-not-forwarding alarm is set or cleared. The first [chars] is the mode, and the
second [chars] is the severity. The third [chars] is the interface name, and the fourth [chars] is the
alarm string.
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 the gathered
information. For more information about these online tools and about contacting Cisco, see the
“Error
Message Traceback Reports” section on page 1-7.