Allied-telesis AT-S60 Uživatelský manuál stáhnout pdf (Strana 190)

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AT-S60 Management Software User’s Guide

Section II: Local and Telnet Management 189

The range for port priority is 0 to 240 in increments of 16. Just as with the

bridge priority value, you specify the increment that corresponds to the

desired value. Table 7 lists the port priority increments. The default value

is 128, with an increment of 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 may also

change. 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.

To forestall the formation of temporarily 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 controls the

amount of time that a port spends in the listening and learning states

prior to changing to the forwarding state.

Table 7 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 ... 185 186 187 188 189 190 191 192 193 194 195 ... 614 615

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