SMC Networks TigerSwitch Manual de usuario Pagina 177

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S
PANNING
T
REE
A
LGORITHM
C
ONFIGURATION
3-127
that can be used when a node or port fails, and retaining the forwarding
database for ports insensitive to changes in the tree structure when
reconfiguration occurs.
Displaying Global Settings
You can display a summary of the current bridge STA information that
applies to the entire switch using the STA Information screen.
Field Attributes
Spanning Tree State – Shows if the switch is enabled to participate
in an STA-compliant network.
Bridge ID – A unique identifier for this bridge, consisting of the
bridge priority and MAC address (where the address is taken from the
switch system).
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.
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