Hub/Switch Reference Guide

420 STP Commands
NN47250-100 (Version 02.51)
designated cost Total path cost to reach the root bridge.
designated_bridge Bridge to which this switch forwards traffic away from the
root bridge.
designated_port STP port through which this switch forwards traffic away
from the root bridge.
top_change_ack Value of the topology change acknowledgment flag in the
next configured bridge protocol data unit (BPDU) to be
transmitted on the associated port. The flag is set in reply to a
topology change notification BPDU.
config_pending Indicates whether a configured BPDU is to be transmitted on
expiration of the hold timer for the port.
port_inconsistency Indicates whether the port is in an inconsistent state.
config BPDU’s xmitted Number of BPDUs transmitted from the port. A number in
parentheses indicates the number of configured BPDUs
transmitted by the WSS for this VLAN’s spanning tree.
config BPDU’s received Number of BPDUs received by this port. A number in
parentheses indicates the number of configured BPDUs
received by the WSS for this VLAN’s spanning tree.
tcn BPDU’s xmitted Number of topology change notification (TCN) BDPUs
transmitted on this port.
tcn BPDU’s received Number of TCN BPDUs received on this port.
forward transition count Number of times the port state transitioned to the forwarding
state.
scp failure count Number of service control point (SCP) failures.
root inc trans count Number of times the root bridge changed.
inhibit loopguard State of the loop guard. In the current release, the state is
always FALSE.
loop inc trans count Number of loops that have occurred.
forward delay timer Status of the forwarding delay timer. This timer monitors the
time spent by a port in the listening and learning states.
forward delay timer value Current value of the forwarding delay timer, in seconds.
message age timer Status of the message age timer. This timer measures the age
of the received protocol information recorded for a port.
message age timer value Current value of the message age timer, in seconds.
topology change timer Status of the topology change timer. This timer determines
the time period during which configured BPDUs are
transmitted with the topology change flag set by this WSS
when it is the root bridge, after detection of a topology
change.
topology change timer value Current value of the topology change timer, in seconds.
Table 4: Output for show spantree statistics (continued)
Field Description