Cisco Catalyst 3560-E Series, Руководство по эксплуатации

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2-101
Catalyst 3750-X, 3750-E, 3560-X, and 3560-E Switch System Message Guide
OL-9772-05
Chapter 2 Message and Recovery Procedures
SPANTREE Messages
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
Verify that this is the desired configuration for the listed interface. Correct it if
this is not the desired configuration.
Error Message
SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port [chars] on
[chars].
Explanation The listed interface has received a BPDU. If the inconsistency was caused 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 No action is required.
Error Message
SPANTREE-2-PVSTSIM_FAIL: Blocking [chars] port [chars]: Inconsistent
[chars] PVST BPDU received on VLAN [dec], claiming root [dec]:[enet]
Explanation
Root guard blocked a port on the multiple spanning-tree (MST) switch. When a
designated port on an MST 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
When STP converges after a new switch or switch port is added to the topology,
root guard might temporarily block the port and then automatically restore it. If the port remains
blocked, identify the root bridge from this error 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
The specified interface no longer receives PVST BPDUs advertising information 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
No action is required.