Allied-telesis AT-FS970M Series Manual do Utilizador descarregar pdf (Página 146)

Chapter 12: Spanning Tree Protocols on the Switch

146

Note

If you try to select MSTP from the menu, a message will appear

indicating that MSTP can only be set via the Command Line

Interface and will not allow the selection. To set the protocol to

MSTP, and for more information on MSTP, see Section VII:

Spanning Tree Protocols in the AT-FS970M Series Version 2.3.1.0

Management Software Command Line Interface User’s Guide and

refer to the STP, RSTP and MSTP Protocols, and MSTP

Commands chapters.

 Status— Enable or disable the spanning tree protocol on the

switch. By default, the spanning tree protocol is enabled.

 Bridge Priority— Assign the switch a bridge priority number. The

device that has the lowest priority number in the spanning tree

domain becomes the root bridge. You can use the priority number

to influence which switch becomes the root bridge. If two or more

devices have the same priority value, the device with the

numerically lowest MAC address becomes the root bridge.

The actual range is 0 to 61440, in increments of 4096, for a total of

16 increments, shown in Table 2. You specify the increment of the

value, from 0 to 15. The default is 32768, which is increment 8.

Note

Set the hello time, forward delay, and max-age fields according to

the following formulas, as specified in IEEE Standard 802.1d:

max-age <= 2 x (forward time - 1.0 second)

max-age => 2 x (hello time + 1.0 second)

Table 2. STP Bridge Priority Value Increments

Increment

Bridge

Priority

Increment

Bridge

Priority

00832768

1 4096 9 36864

2 8192 10 40960

3 12288 11 45056

4 16384 12 49152

5 20480 13 53248

6 24576 14 57344

7 28672 15 61440

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 329 330

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