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• 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.
• Max hops – The max number of hop counts for the MST region.
• Remaining hops – The remaining number of hop counts for the MST
instance.
• Transmission limit – The minimum interval between the
transmission of consecutive RSTP/MSTP 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.