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Cisco ME 3400E, ME 3400, and ME 2400 Ethernet Access Switch System Message Guide
OL-23408-01
Chapter 2 Messages and Recovery Procedures
SPANTREE Messages
Error Message SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on [chars]
[chars].
Explanation
The listed interface received an SSTP BPDU without the VLAN ID tag. The BPDU is
discarded. The first [chars] is the interface, and the second [chars] is the VLAN that received the
SSTP BPDU.
Recommended Action If this message recurs, 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 need assistance, open a case with
the TAC, or provide your Cisco technical support representative with your information. For more
information about these online tools and about contacting Cisco, see the “Error Message Traceback
Reports” section on page 1-5.
Error Message SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id
[dec] on [chars] [chars].
Explanation
The listed interface received an SSTP BPDU that is tagged with a VLAN ID that does
not match the VLAN ID that received the BPDU. This occurs when the native VLAN is not
consistently configured on both ends of an 802.1Q trunk. [dec] is the VLAN ID, the first [chars] is
the port, and the second [chars] is the VLAN.
Recommended Action Verify that the configurations of the native VLAN ID is consistent on the
interfaces on each end of the 802.1Q trunk connection. When the configurations are consistent,
spanning tree automatically unblocks the interfaces.
Error Message SPANTREE-2-ROOTGUARD_BLOCK: Root guard blocking port [chars] on
[chars].
Explanation
The listed interface received a BPDU that advertises a superior spanning-tree root
bridge (lower bridge ID, lower path cost, and so forth) than that in use. The interface is put into
blocking state and marked as root-guard inconsistent to prevent a suboptimal spanning-tree
topology from forming. The first [chars] is the port name, and the second [chars] is the spanning-tree
mode displayed in the output of the show spanning-tree privileged EXEC command.
Recommended Action Enter the show spanning-tree inconsistentports privileged EXEC command
to review the list of interfaces with root-guard inconsistencies. Find out why devices connected to
the listed ports are sending BPDUs with a superior root bridge, and take action to prevent more
occurrences. When the inaccurate BPDUs have been stopped, the interfaces automatically recover
and resume normal operation. Make sure that it is appropriate to have root guard enabled on the
interface.
Error Message SPANTREE-2-ROOTGUARD_CONFIG_CHANGE: Root guard [chars] on port [chars]
on [chars].
Explanation
The spanning-tree root guard configuration for the listed interface has changed. If
enabled, any BPDU received on this interface that advertises a superior spanning-tree root bridge
(lower bridge ID, lower path cost, and so forth) to that already in use causes the interface to be put
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