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VigorSwitch P2260 User’s Guide
69
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.
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The STP, Spanning Tree Protocol, actually includes RSTP. In the Spanning Tree
Configuration, there are six parameters open for the user to configure as user’s idea. Each
parameter description is listed below.
Function name:
STP Configuration
Function description: