Avaya Configuring Bridging Services Manual de usuario Pagina 51

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Using Transparent Bridge Services
117351-A Rev. A 1-29
Parameter: Forward Delay
Default: 15 [seconds (expressed in hundredths of a second: 1500)]
Options: 4 to 30 seconds
Function: Specifies the time in seconds that a circuit spends in the listening and
learning states. If you set this parameter to the minimum value, the
spanning tree converges at its fastest rate.
As the spanning tree algorithm operates, it eventually places all circuits in
either a forwarding (enabled) or blocking (disabled) state. In response to
network topology changes, the spanning tree algorithm may change the
state of specific circuits. To prevent network looping caused by sudden
state changes, the spanning tree algorithm does not change circuits
directly from the blocking to the forwarding state. Rather, it places them
in two intermediate states: listening and learning.
In the listening (standby) state, the circuit listens for network-generated
BPDUs. It receives and drops all other traffic. When the forward delay
timer expires, the spanning tree algorithm places the circuit in the
learning state.
In the learning state, the circuit receives both network-generated BPDUs
and end station-generated traffic that is subjected to the learning process
but is not relayed. When the forward delay timer expires, the spanning
tree algorithm places the circuit in the forwarding state.
We recommend that you accept the default, 15 seconds; however, if you
change the value, you must follow the guidelines listed previously in this
section.
Instructions: Either accept the default value or enter a new value. Make sure you enter
the new value in hundredths of a second.
MIB Object ID: 1.3.6.1.4.1.18.3.5.1.2.1.17
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