Cisco IE-3000-8TC Message Manual page 69

Chapter 2 Message and Recovery Procedures
feature is mainly used to detect unidirectional links. The first [chars] is the loopguard state (enable
or disable), the second [chars] is the interface name, and the third [chars] is the spanning-tree
instance.
Recommended Action
this is not the desired configuration; otherwise, no further action is required.
Error Message SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port [chars] on
[chars].
Explanation
by a unidirectional link failure, the problem no longer exists. The loopguard-inconsistency is cleared
for the interface, which is taken out of the blocking state, if appropriate. The first [chars] is the port
name, and the second [chars] is the spanning-tree mode displayed in the show spanning-tree
privileged EXEC command.
Recommended Action
Error Message SPANTREE-2-PVSTSIM_FAIL: Blocking [chars] port [chars]: Inconsistent
[chars] PVST BPDU received on VLAN [dec], claiming root [dec]:[enet]
Explanation
switch is connected to a PVST+ switch, the CIST (MST00) information on the port of the MST
switch must be consistently superior (lower bridge ID, lower path cost, and so forth) to the
information in all the PVST+ messages. If the port is the root, the CIST (MST00) information on
the MST switch must be consistently inferior to all the PVST+ messages. If this constraint is
violated, the port on the MST switch is blocked to prevent a potential bridging loop. The first [chars]
is the MST switch, the second [chars] is the port, and the third [chars] is the PVST+ switch. The first
[dec] is the VLAN ID, the second [dec] is the MST switch, and [enet] is the MST-switch MAC
address.
Recommended Action
topology, this condition might happen briefly. In such cases, the port unblocks automatically. If the
port remains blocked, identify the root bridge as reported in the message, and configure the
appropriate priority for the VLAN spanning tree, consistent with the CIST role on the port of the
MST switch.
There could be additional inconsistencies not shown in the message, and the port does not recover
until all these are cleared. To determine which other VLANs have inconsistencies, disable and
re-enable the port. This message appears again and specifies another VLAN with inconsistencies to
be fixed. Repeat this process until all inconsistencies on all VLANs are cleared.
Error Message SPANTREE-2-PVSTSIM_OK: PVST Simulation inconsistency cleared on port
[chars].
Explanation
that is inconsistent with the CIST port information. The PVST simulation inconsistency is cleared,
and the interface returns to normal operation. [chars] is the port.
Recommended Action
OL-13020-01
Verify that this is the desired configuration for the listed interface. Correct it if
The listed interface has received a BPDU, and therefore, if the inconsistency was caused
No action is required.
The specified port on the MST switch is blocked. When a designated port on an MST
When STP is converging after a new switch or switch port is added to the
The specified interface is no longer receiving PVST BPDUs advertising information
No action is required.
Cisco IE 3000 Switch System Message Guide
SPANTREE Messages
2-55