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Cisco IE 3000 Switch System Message Guide
OL-13020-01
Chapter 2 Message and Recovery Procedures
SPANTREE Messages
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
into the blocking state and marked as root-guard inconsistent. The first [chars] is the root-guard state
(enable or disable), the second [chars] is the interface, 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
it is not the desired configuration; otherwise, no action is required.
Error Message SPANTREE-2-ROOTGUARD_UNBLOCK: Root guard unblocking port [chars] on
[chars].
Explanation The listed interface is no longer receiving BPDUs advertising a superior root bridge
(lower bridge ID, lower path cost, and so forth). The root-guard inconsistency is cleared for the
interface, and the blocking state is removed from the interface. The first [chars] is the port name,
and the second [chars] is the spanning-tree mode displayed in show spanning-tree privileged EXEC
command.
Recommended Action No action is required.
Error Message SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking [chars] on [chars]. Port
consistency restored.
Explanation The port VLAN ID or port type inconsistencies have been resolved, and spanning tree
will unblock the listed interface of the listed spanning-tree instance as appropriate. The first [chars]
is the interface, and the second [chars] is the spanning-tree instance.
Recommended Action No action is required.
Error Message SPANTREE-3-BAD_PORTNUM_SIZE: Rejected an attempt to set the port
number field size to [dec] bits (valid range is [dec] to [dec] bits).
Explanation An error occurred in the platform-specific code that caused it to request more or less
bits than are possible. The spanning-tree port identifier is a 16-bit field, which is divided evenly
between the port priority and port number, with each subfield being 8 bits. This allows the port
number field to represent port numbers between 1 and 255. However, on systems with more than
255 ports, the size of port number portion of the port ID must be increased to support the number of
ports. This is performed by the spanning-tree subsystem at system initialization because the
maximum number of ports on a particular platform will not change. This error occurs because of an
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