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Show the current root bridge priority.
y Root Port:
Show port number connected to root bridge with the lowest path cost.
y Root Path Cost:
Show the path cost between the root port and the designated port of the root bridge.
y Current Max. Age:
Show the current root bridge maximum age time. Maximum age time is used to monitor if STP
topology needs to change. When a bridge does not receive a hello message from root bridge until the
maximum age time is counted down to 0, the bridge will treat the root bridge malfunctioned and issue a
Topology Change Notification (TCN) BPDU to all other bridges. All bridges in the LAN will re-learn and
determine which the root bridge is. Maximum Age time is assigned by Root Bridge in unit of seconds.
Default is 20 seconds.
y Current Forward Delay:
Show the current root bridge forward delay time. The value of Forward Delay time is set by root. The
Forward Delay time is defined as the time spent from Listening state moved to Learning state or from
Learning state moved to Forwarding state of a port in bridge.
y Hello Time:
Show the current hello time of the root bridge. Hello time is a time interval specified by root bridge,
used to request all other bridges periodically sending hello message every “hello time” seconds to the
bridge attached to its designated port.
y STP Topology Change Count:
STP Topology Change Count expresses the time spent in unit of seconds since the beginning of the
Spanning Tree Topology Change to the end of the STP convergence. Once the STP change is
converged, the Topology Change count will be reset to 0. The figures showing in the screen may not
be the exact time it spent but very close to, because the time is eclipsing.
y Time Since Last Topology Change:
Time since Last Topology Change is the accumulated time in unit of seconds the STP has been since
the last STP Topology Change was made. When Topology Change is initiated again, this counter will
be reset to 0. And it will also count again once STP topology Change is completed.
3.12.2 STP Configuration
User can set the following Spanning Tree parameters to control STP function enable/disable, select mode
RSTP/STP and affect STP state machine behavior to send BPDU in this switch. The default setting of
Spanning Tree Protocol is “Disable”.
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