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SPANTREE Messages
Error Message SPANTREE-2-BLOCK_PVID_PEER: Blocking [chars] on [chars]. Inconsistent
peer vlan.
Explanation
instance and interface will be held in the spanning-tree blocking state until the port VLAN ID
(PVID) inconsistency is resolved. The listed spanning-tree instance is that of the native VLAN ID
of the interface on the peer switch to which the listed interface is connected. The first [chars] is the
interface, and the second [chars] is the spanning-tree instance.
Recommended Action
interfaces on each end of the 802.1Q trunk connection. When interface inconsistencies are
corrected, spanning tree automatically unblocks the interfaces.
Error Message SPANTREE-2-CHNL_MISCFG: Detected loop due to etherchannel
misconfiguration of [chars] [chars].
Explanation
example, the ports on one side of the EtherChannel either are not configured to be in the channel or
failed to bundle into the channel and the other side has successfully bundled the ports into the
EtherChannel. The first [chars] is the port, and the second [chars] is the VLAN.
Recommended Action
privileged EXEC command, and then check the EtherChannel configuration on the remote device
by using the show etherchannel summary privileged EXEC command on the remote device. After
the configuration is correct, enter the shutdown and then no shutdown interface configuration
commands on the associated port-channel interfaces.
Error Message SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port [chars] on
[chars].
Explanation
BPDUs were received from the designated bridge. Because this condition could be caused by a
unidirectional-link failure, the interface is put into the blocking state and marked as
loopguard-inconsistent to prevent possible loops from being created. The first [chars] is the port
name, and the second [chars] is the spanning-tree mode displayed in the show spanning-tree
privileged EXEC command.
Recommended Action
to review the list of interfaces with loopguard inconsistencies. Find out why devices connected to
the listed ports are not sending BPDUs. One reason might be that they are not running the STP. If
so, you should disable loop guard on the inconsistent interfaces by using the spanning-tree guard
none interface configuration command or by starting the STP on the remote side of the links.
Error Message SPANTREE-2-LOOPGUARD_CONFIG_CHANGE: Loop guard [chars] on port [chars]
on [chars].
Explanation
interface has been changed. If enabled, the interface is placed into the blocking state. It is marked
as loopguard-inconsistent when the message-age timer expires because no BPDUs were received
Cisco ME 3400 and 2400 Ethernet Access Switch System Message Guide
2-60
This message means that the spanning-tree port associated with the listed spanning-tree
Verify that the configuration of the native VLAN ID is consistent on the
This message means that a misconfiguration of a channel group has been detected. For
Identify the local ports using the show interfaces status err-disabled
This message means that the spanning-tree message age timer has expired because no
Enter the show spanning-tree inconsistentports privileged EXEC command
This message means that the spanning-tree loopguard configuration for the listed
Chapter 2
Messages and Recovery Procedures
OL-9641-01
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