Allied-telesis AT-S21 Manual de usuario descargar pdf (Pagina 40)

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Menu:

Bridging>spanning tree parameters

This option allows you to change the following spanning tree

parameters. The default values are:

Bridge Priority: 32768

Max Age Time: 20

Hello Time: 2

Forwarding delay: 15

Bridge Priority:

The number can be from

65,535

, with

being the highest priority. The number consists of a 2-byte

bridge priority number and a 6-byte MAC address. Bridges use

this number to determine the root bridge for a loop-free

implementation. If bridges happen to have equal priority

values, the bridge with the numerically lowest MAC address

becomes the

root bridge

. When the root bridge

malfunctions, the bridge with the next priority number (the

next lowest MAC address) automatically takes over as root

bridge.

Max Age Time:

The aging time can be from

6-40

seconds, with

seconds as a default. All bridges in a bridged LAN use this

aging time to test the age of stored configuration messages

called bridge protocol data units (BPDUs).

For example, if you use the default

, all bridges delete

current configuration messages after

seconds.

Note

Aging time for BPDUs is different from aging time in the MAC address

table.

Hello Time:

Hello time can be from

1-10

seconds, with

seconds

as the default. Bridges use this parameter to determine the

time interval between generating and sending configuration

messages.

Forwarding Delay:

The default is

seconds. The time indicates

the waiting period before a bridge changes to a new state, for

example, becomes the new root bridge after the topology

changes. If the bridge transitions too soon, not all links may

have yet adapted to the change; therefore, loops may result.

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Allied-telesis AT-S21 Manual de usuario Pagina 40

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