Lantech LGS-2816C-RPS, Руководство пользователя

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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.

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.

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.
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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.

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.