SPANNING TREE PROTOCOL CONFIGURATION
•Designated Root — Identifies the priority and MAC address of the device in the Spanning Tree that the switch has accepted as the root device.
-Root Port — Specifies the port number on the switch that is closest to the root. The switch communicates with the root device through this port. If there is no root port, the switch has been accepted as the root device of the Spanning Tree network.
-Root Path Cost — Identifies the path cost from the root port on the switch to the root device.
•Root Hello Time* – Interval (in seconds) at which this device transmits a configuration message.
•Root Maximum Age* – The maximum time (in seconds) this device can wait without receiving a configuration message before attempting to reconfigure. All device ports (except for designated ports) should receive configuration messages at regular intervals. If the root port ages out STA information (provided in the last configuration message), a new root port is selected from among the device ports attached to the network. (References to “ports” in this section means “interfaces,” which includes both ports and trunks.)
•Root Forward Delay* – The maximum time (in seconds) this device will wait before changing states (i.e., discarding to learning to forwarding). This delay is required because every device must receive information about topology changes before it starts to forward frames. In addition, each port needs time to listen for conflicting information that would make it return to a discarding state; otherwise, temporary data loops might result.
•Configuration Changes — Specifies the number of times the Spanning Tree has been reconfigured.
•Last Topology Change — Identifies the time since the Spanning Tree was last reconfigured.
