D-Link DES-3225G Manuel d'utilisateur télécharger pdf (Page 47)

24-port NWay Ethernet Switch User’s Guide

Switch Management Concepts

the Designated Bridges. On the port level, STA sets the

Root Port and Designated Ports. Details are as follows:

On the Bridge Level

♦

Root Bridge The switch with the lowest Bridge

Identifier is the Root Bridge. Naturally, you will want

the Root Bridge to be the best switch among the

switches in the loop to ensure the highest network

performance and reliability.

♦

Bridge Identifier This is the combination of the

Bridge Priority (a parameter that you can set) and

the MAC address of the switch. Example: 4 00 80 C8

00 01 00, where 4 is the Bridge Priority. A lower

Bridge Identifier results in a higher priority for the

switch, and thus increases it probably of being

selected as the Root Bridge.

♦

Designated Bridge From each LAN segment, the

attached Bridge that has the lowest Root Path Cost to

the Root Bridge is the Designated Bridge. It forwards

data packets for that LAN segment. In cases where all

Switches have the same Root Path Cost, the switch

with the lowest Bridge Identifier becomes the

Designated Bridge.

♦

Root Path Cost The Root Path Cost of a switch is the

sum of the Path Cost of the Root Port and the Root

Path Costs of all the switches that the packet goes

through. The Root Path Cost of the Root Bridge is

zero.

♦

Bridge Priority This is a parameter that users can

set. The smaller the number you set, the higher the

Bridge Priority is. The higher the Bridge Priority,

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D-Link DES-3225G Manuel d'utilisateur Page 47