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Management Guide
3-13
STA (Spanning Tree Algorithm)
The Spanning Tree Algorithm can be used to detect and disable network loops,
and to provide backup links between switches, bridges or routers. This allows the
switch to interact with other bridging devices (that is, STA compliant switch, bridge
or router) in your network to ensure that only one route exists between any two
stations on the network. For a more detailed description of how to use this
algorithm, refer to “Spanning Tree Algorithm” in Chapter 4.
Spanning Tree Information
The Spanning Tree Information screen displays a summary of the STA information
for the overall bridge or for a specific port. To make any changes to the parameters
for the Spanning Tree, use the Spanning Tree Configuration screen.
Spanning Tree
The parameters shown in the following figure and table describe the current bridge
STA Information.
Parameter Description
Spanning Tree State Shows if switch is enabled to participate in an STA compliant network.
Bridge ID A unique identifier for this bridge, consisting of bridge priority plus MAC
address (the MAC address of the switch unit).
Max Age The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure.
Hello Time The time interval (in seconds) at which the root device transmits a
configuration message.
Forward Delay The maximum time (in seconds) the root device will wait before changing
states (i.e., listening to learning to forwarding).
Designated Root The priority and MAC address of the device in the spanning tree that this
switch has accepted as the root device.
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.
Root Path Cost The path cost from the root port on this switch to the root device.
Configuration Changes The number of times the spanning tree has been reconfigured.
Last Topology Change The time since the spanning tree was last reconfigured