Alloy Computer Products POEGEM12T2SFP Designated Priority, Root Port, Root Path Cost, Hello Time

POEGEM12T2SFP User Manual

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.

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