Moxa-technologies Moxa EtherDevice Switch EDS-508 Manual de usuario descargar pdf (Pagina 40)

EDS-508 Series User’s Manual Featured Functions

3-24

If a link failure is detected, as shown in next figure, the STP process reconfigures the network so

that traffic from LAN segment 2 flows through Bridge B.

STP determines which path between each bridged segment is the most efficient, and assigns a

specific reference point on the network. Once the most efficient path has been determined, all

other paths are blocked. Therefore, in the above 3 figures, STP initially determined that the path

through Bridge C was the most efficient, and consequently blocked the path through Bridge B.

After the failure of Bridge C, STP re-evaluated the situation and opened the path through Bridge

How STP Works

When enabled, STP determines the most appropriate path for traffic through a network. The way it

does this is outlined in the sections below.

STP Requirements

Before it can configure the network, the STP system requires:

# Communication between all the bridges. This communication is carried out using Bridge

Protocol Data Units (BPDUs), which are transmitted in packets with a known multicast

address.

# Each bridge must have a Bridge Identifier that specifies which bridge acts as the central

reference point, or Root Bridge, for the STP system—bridges with a lower Bridge Identifier

Brid

e B

Brid

e C

LAN 1

LAN 2

LAN 3

Brid

e A

Brid

e B

Brid

e C

LAN 1

LAN 2

LAN 3

Brid

e A

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Moxa-technologies Moxa EtherDevice Switch EDS-508 Manual de usuario Pagina 40