Cisco Catalyst 4500 Series Message Manual page 113

Chapter 2 Messages and Recovery Procedures
Error Message SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id
[dec] on [char] [char]
Explanation
not match the VLAN ID on which the BPDU was received. This condition occurs when the native
VLAN is not consistently configured on both ends of an 802.1Q trunk. [dec] is the VLAN ID. The
interface ID is [char].
Recommended Action
interfaces on each end of the 802.1Q trunk connection. Once the configuration is consistent,
spanning tree automatically unblocks the interfaces.
Error Message SPANTREE-2-ROOTGUARD_BLOCK: Root guard blocking port [char] on [char].
Explanation
that was superior to the one already in use. The interface is put into a blocking state and marked as
root guard inconsistent to prevent a suboptimal spanning tree topology from forming.
Recommended Action
of interfaces with root guard inconsistencies. Determine why devices that are connected to the listed
ports are sending BPDUs with a superior root bridge, and then take action to prevent further
occurrences. Once the invalid BPDUs have been stopped, the interfaces automatically recover and
resume normal operation. By looking at the configuration, ensure that it is appropriate to enable root
guard on the interface.
Error Message SPANTREE-2-ROOTGUARD_CONFIG_CHANGE: Root guard [char] on port [char].
Explanation
If root guard is enabled, any BPDU that is received on the interface that advertises a superior
spanning tree root bridge to the one that is already in use will cause the interface to be put into
blocking state and marked as root guard inconsistent.
Recommended Action
the correct configuration, change the configuration to one that is appropriate for the interface.
Error Message SPANTREE-2-ROOTGUARD_UNBLOCK:Root guard unblocking port [char] on
[char].
Explanation
bridge. The root guard inconsistency is cleared for the interface and then is taken out of the blocking
state if appropriate.
Recommended Action
OL-11541-01
The listed interface received an SSTP BPDU that is tagged with a VLAN ID that does
Verify that the configuration of the native VLAN ID is consistent on the
A BPDU was received on the listed interface that advertised a spanning tree root bridge
Enter the show spanning-tree inconsistentports command to review the list
There was a change in the spanning tree root guard configuration for the listed interface.
Verify that this is the correct configuration for the listed interface. If this is not
The listed interface is no longer receiving BPDUs that are advertising a superior root
This is an informational message only. No action is required.
Catalyst 4500 Series Switch Cisco IOS System Message Guide Release 12.2(31)SGA
SPANTREE Messages
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