D-Link DES-3326S - Switch - Stackable Uživatelská příručka stáhnout pdf (Strana 67)

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

Switch Management and Operating Concepts 67

Illustration of STP

A simple illustration of three Bridges (or three switches)

connected in a loop is depicted below. In this example, you can

anticipate some major network problems if the STP assistance

is not applied. If Bridge A broadcasts a packet to Bridge B,

Bridge B will broadcast it to Bridge C, and Bridge C will

broadcast it to back to Bridge A ... and so on. The broadcast

packet will be passed indefinitely in a loop, potentially causing

a network failure.

STP can be applied as shown in Figure 2-4. In this example,

STP breaks the loop by blocking the connection between Bridge

B and C. The decision to block a particular connection is based

on the STP calculation of the most current Bridge and Port

settings. Now, if Bridge A broadcasts a packet to Bridge C,

then Bridge C will drop the packet at port 2 and the broadcast

will end there.

Setting-up STP using values other than the defaults, can be

complex. Therefore, you are advised to keep the default factory

settings and STP will automatically assign root bridges/ports

and block loop connections. Influencing STP to choose a

particular switch as the root bridge using the Priority setting,

or influencing STP to choose a particular port to block using

the Port Priority and Port Cost settings is, however, relatively

straight forward.

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 348 349

Žádné komentáře

D-Link DES-3326S - Switch - Stackable Uživatelská příručka Strana 67