Allied-telesis AT-GS950/16 User Manual download pdf (Page 75)

100

101

AT-GS950/16 Web Interface User Guide

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

change has occurred, especially if it is a large network. A temporary data

loop could occur if a topology change is made before all bridges have

been notified and that could adversely impact network performance.

To forestall the formation of temporary data loops during topology

changes, a port designated to change from blocking to forwarding passes

through two additional states - listening and learning - before it begins to

forward frames. The amount of time a port spends in these states is set by

the forwarding delay value. This value states the amount of time that a port

spends in the listening and learning states prior to changing to the

forwarding state.

Table 1. Valid Port Priority Values

Step

Port

Priority

216

332

448

564

680

796

8112

9 128

10 144

11 160

12 176

13 192

14 208

15 224

16 240

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 403 404

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Allied-telesis AT-GS950/16 User Manual Page 75

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