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• Hello 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., 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.
• 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.
• 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
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