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ONFIGURING
THE
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WITCH
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• Max Age – The maximum time (in seconds) a 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. Any port that ages out STA
information (provided in the last configuration message) becomes the
designated port for the attached LAN. If it is a root port, a new root
port is selected from among the device ports attached to the network.
(References to “ports” in this section mean “interfaces,” which
includes both ports and trunks.)
• 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.
• Configuration Changes – The number of times the Spanning Tree
has been reconfigured.
• Last Topology Change – Time since the Spanning Tree was last
reconfigured.