Table of Contents
Advertisement
SPANTREE Messages
Error Message SPANTREE-2-RECV_1Q_NON_1QTRUNK: Received 802.1Q BPDU on non 802.1Q
trunk [chars] [chars].
Explanation
(SSTP) BPDU was received was in trunk mode but was not using 802.1Q encapsulation. The first
[chars] is the port, and the second [chars] is the VLAN.
Recommended Action
that of the interface to which it is connected are in the same mode (access or trunk). If the mode is
trunk, verify that both interfaces have the same encapsulation (none or 802.1Q). When the
encapsulation is consistent, spanning tree automatically unblocks the interface.
Error Message SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on [chars]
[chars].
Explanation
VLAN ID tag. The BPDU is discarded. The first [chars] is the port, and the second [chars] is the
VLAN that received the SSTP BPDU.
Recommended Action
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 SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id
[dec] on [chars] [chars].
Explanation
a VLAN ID that does not match the VLAN ID on which the BPDU was received. 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
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
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
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
Cisco ME 3400E, ME 3400, and ME 2400 Ethernet Access Switch System Message Guide
2-70
This message means that the listed interface on which a Shared Spanning Tree Protocol
Verify that the configuration and operational state of the listed interface and
This message means that the listed interface received an SSTP BPDU without the
If this message recurs, copy the message exactly as it appears on the console
"Error Message Traceback Reports" section on page
This message means that the listed interface received an SSTP BPDU that is tagged with
Verify that the configurations of the native VLAN ID is consistent on the
This message means that on the listed interface a BPDU was received that advertises a
Enter the show spanning-tree inconsistentports privileged EXEC command
Chapter 2
Messages and Recovery Procedures
1-3.
OL-9641-04
Advertisement
Table of Contents
