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Cisco NX-OS System Messages Reference
OL-15994-03
Chapter 2 System Messages and Recovery Procedures
STP Messages
Error Message STP-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on [chars]
[chars].
Explanation The list interface received a SSTP BPDU that was missing the VLAN ID tag. The
BPDU is discarded.
Recommended Action No action is required.
Error Message STP-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id
[dec] on [chars] [chars].
Explanation The listed interface received a SSTP BPDU that is tagged with 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 a 802.1Q trunk.
Recommended Action Verify that the configuration of the native VLAN ID is consistent on the
interfaces on each end of the 802.1Q trunk connection. Once corrected, spanning tree will
automatically unblock the interfaces as appropriate.
Error Message STP-2-ROOTGUARD_BLOCK: Root guard blocking port [chars] on [chars].
Explanation A BPDU was received on the listed interface which advertizes a superior spanning tree
root bridge to that currently in use. The interface is put into blocking state and marked as root guard
inconsistent in order to prevent a suboptimal spanning tree topology to form.
Recommended Action Issue the <CmdBold>show spanning-tree inconsistentports<noCmdBold>
command to review the list of interfaces with root guard inconsistencies. Determine why devices
connected to the listed ports are sending BPDUs with a superior root bridge and take action to
prevent further occurrences. Once the bogus BPDUs have been stopped, the interfaces will
automatically recover and resume normal operation. Make sure that it is appropriate to have root
guard enabled on the interface.
Error Message STP-2-ROOTGUARD_CONFIG_CHANGE: Root guard [chars] on port [chars].
Explanation The spanning tree root guard configuration for the listed interface has been changed. If
enabled, any BPDU received on this interface which advertizes a superior spanning tree root bridge
to that already in use will cause the interface to be put into blocking state and marked as root guard
inconsistent.
Recommended Action Verify that this is the desired configuration for the listed interface. Correct it
if this is not the desired configuration otherwise no further action is required.
Error Message STP-2-ROOTGUARD_UNBLOCK: Root guard unblocking port [chars] on
[chars].
Explanation The listed interface is no longer receiving BPDUs advertising a superior root bridge.
The root guard inconsistency is cleared for the interface and then it is taken out of the blocking state
if appropriate.
Recommended Action No user action is required.
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