Spantree Messages; Spantree-2 - Cisco Catalyst 4500 Series System Message Manual

Chapter 2 Messages and Recovery Procedures
Error Message SPANTREE-2-BLOCK_PVID_PEER: Blocking [char] on [char]. Inconsistent
peer vlan.
Explanation
listed instance and interface is held in 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.
Recommended Action
interfaces on each end of the 802.1Q trunk connection. When 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 of one side of the EtherChannel either are not configured to be in the channel or
failed to bundle, while ports on the other side of the EtherChannel are successfully bundled.
Recommended Action
err-disabled command. Check the EtherChannel configuration on the remote device by entering the
show etherchannel summary command on the remote device. After the configuration is corrected,
enter the shutdown/no shutdown command on the associated port-channel interface.
Error Message SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port [char] on [char].
Explanation
the designated bridge. Because this condition could be caused by an unidirectional link failure, the
interface is put into blocking state and marked as loop guard inconsistent in order to prevent possible
loops from being created.
Recommended Action
interfaces with loop guard inconsistencies. Determine why devices that are connected to the listed
ports are not sending BPDUs. One reason could be that they do not run the Spanning Tree Protocol;
in this case, you should disable loop guard in the inconsistent interfaces or start the Spanning Tree
Protocol on the other side of the links, depending on the context. Another reason could be a failure
in the cable. If the link has a failure that makes it unidirectional (you can transmit, but you cannot
receive), you should replace the old cable with a new cable.
Error Message SPANTREE-2-LOOPGUARD_CONFIG_CHANGE: Loop guard [char] on port [char].
Explanation
When enabled, the interface will be put into blocking state and marked as loop guard inconsistent
when the message age timer expires because no BPDUs were received from the designated bridge.
This feature is used to detect unidirectional links.
Recommended Action
this is not the desired configuration; otherwise, no further action is required.
OL-13091-01
The spanning tree port (with spanning-tree port ID [char]) that is associated with the
Verify that the configuration of the native VLAN ID is consistent on the
A misconfigured channel group (with channel group ID [chars]) was detected. For
Locate the misconfigured local ports by entering the show interfaces status
The spanning tree message age timer expired, because no BPDUs were received from
Use the show spanning-tree inconsistentports command to review the list of
There was a change in the spanning tree loop guard configuration for the listed interface.
Verify that this is the desired configuration for the listed interface. Correct it if
Catalyst 4500 Series Switch Cisco IOS System Message Guide

SPANTREE Messages

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