Allied-telesis AT-S62 Manual do Utilizador descarregar pdf (Página 460)

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Chapter 23: STP and RSTP

Section IV: Spanning Tree Protocols 460

Port Priority

If two paths have the same cost, the bridges must choose between them

to select a preferred path. In some instances this can involve the use of

the port priority parameter. This parameter is used as a tie-breaker when

two paths have the same cost. The lower the value, the higher the

priority given to the port.

The range for port priority is 0 to 240. As with bridge priority, this range

is broken into increments, in this case multiples of 16. To select a port

priority for a port, you enter the increment of the desired value. Table 15

lists the values and increments. The default value is 128, which is

increment 8.

Forwarding Delay and Topology Changes

If there is a change in the network topology due to a failure, removal, or

addition of any active components, the active topology also changes.

This may trigger a change in the state of some blocked ports. However, a

change in a port state is not activated immediately.

It might take time for the root bridge to notify all bridges that a topology

change has occurred, especially if it is a large network. If a topology

change is made before all bridges have been notified, a temporary data

loop could occur, and that could adversely impact network

performance.

Table 15 Port Priority Value Increments

Increment

Port

Priority

Increment

Port

Priority

008128

1169144

2 3210160

3 4811176

4 6412192

5 8013208

6 9614224

7 112 15 240

1 2 ... 455 456 457 458 459 460 461 462 463 464 465 ... 759 760

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