Alloy Computer Products GSM-8T16SFP - Manual (Page 84)

GSM Series User Manual
80
Alloy Computer Products Pty Ltd Copyright ©2006
bridge, the “Designated Root” will be this switches bridge ID.
Designated Priority:
Shows the current root bridge priority.
Root Port:
Shows the port number connected to the root bridge with the lowest path cost.
Root Path Cost:
Shows the path cost between the root port and the designated port of the root
bridge.
Current Max. Age:
Shows the current root bridge maximum age time. Maximum age time is used to
monitor if the STP topology needs to change. When a bridge does not receive a
hello message from a root bridge until the maximum age time is counted down to
0, the bridge will treat the root bridge as malfunctioned and issue a Topology
Change Notification (TCN) BPDU to all other bridges.
All bridges in the LAN will re-learn and determine who the root bridge is.
Maximum Age time is assigned by the root bridge in units of seconds.
Default: 20 seconds.
Current Forward Delay:
Shows the current root bridge forward delay time. The value of the Forward
Delay time is set by the root. The Forward Delay time is defined as the time
spent changing from the Listening state to the Learning state or from the
Learning state to the Forwarding state of a port in the bridge.
Hello Time:
Shows the current hello time of the root bridge. The Hello time is a time interval
specified by the root bridge, used to request all other bridges to periodically send
hello messages every “hello time” in seconds to the bridge attached to its
designated port.
STP Topology Change Count:
Shows the time spent in units 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.
Time Since Last Topology Change:
Shows the accumulated time in units of seconds since the last STP Topology
Change was made. When a Topology Change is initiated again, this counter will
be reset to 0.