2-71
Cisco ME 3400E, ME 3400, and ME 2400 Ethernet Access Switch System Message Guide
OL-9641-04
Chapter 2 Messages 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
This message means that 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
This message means that 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
This message means that 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
This message means that 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