System information

SIGNAMAX a.s.
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166
Designated Priority:
Show the current root bridge priority.
Root Port:
Show port number connected to root bridge with the lowest path cost.
Root Path Cost:
Show the path cost between the root port and the designated port of the root
bridge.
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.
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.