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Chapter 5: Configuring the Switch through the Web Utility
Spanning Tree
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Information
You can display a summary of the current bridge STA information that applies to the entire switch using the
Information screen.
This screen displays the following information.
Spanning Tree State. Shows if the switch is enabled to participate in an STA-compliant network.
Designated Root. The priority and MAC address of the device in the Spanning Tree that this switch has accepted
as the root device.
Bridge ID. A unique identifier for this bridge, consisting of the bridge priority and MAC address (where the
address is taken from the switch system).
Root Port. The number of the port on this switch that is closest to the root. This switch communicates with the
root device through this port. If there is no root port, then this switch has been accepted as the root device of the
Spanning Tree network.
Max Age. The maximum time (in seconds) a 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. Any port that ages out STA information (provided in the last configuration message) becomes
the designated port for the attached LAN. If it is a root port, a new root port is selected from among the device
ports attached to the network. (References to “ports” in this section mean “interfaces,” which includes both
ports and lags.)
Root Path Cost. The path cost from the root port on this switch to the root device.
Hello Time. Interval (in seconds) at which this device transmits a configuration message.
Configuration Changes. The number of times the Spanning Tree has been reconfigured.
Forward Delay. The maximum time (in seconds) the root 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.
Last Topology Change. Time since the Spanning Tree was last reconfigured.
Figure 5-59: Spanning Tree - Information