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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.
• Transmission limit – The minimum interval between the
transmission of consecutive RSTP BPDUs.
•Path Cost Method – The path cost is used to determine the best path
between devices. The path cost method is used to determine the range
of values that can be assigned to each interface.
Web – Click Spanning Tree, STA, Information.
Figure 3-65. Displaying the Spanning Tree Algorithm
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