System information

Spanning Tree Algorithm Configuration
3-75
• 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.
• 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.