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32
I
LLUSTRATION OF STA
A simple illustration of three Bridges (or TE100-S55) connected
in a loop is depicted in Figure 3-2. In this example, you can
anticipate some major network problems if the STA assistance is
not applied. For instance, if Bridge 1 broadcasts a packet to
Bridge 2, Bridge 2 will broadcast it to Bridge 3, and Bridge 3
will broadcast it to Bridge 1...and so on. The broadcast packet
will be passed indefinitely in a loop, causing a serious network
failure.
To alleviate network loop problems, STA can be applied as
shown in Figure Chapter 3 -3. In this example, STA breaks the
loop by blocking the connection between Bridge 1 and 2. The
decision to block a particular connection is based on the STA
calculation of the most current Bridge and Port settings. Now, if
Bridge 1 broadcasts a packet to Bridge 3, then Bridge 3 will
broadcast it to Bridge 2 and the broadcast will end there.
STA setup can be somewhat complex. Therefore, you are advised
to keep the default factory settings and STA will automatically
assign root bridges/ports and block loop connections. However,
if you need to customize the STA parameters, refer to Table 3-3
on page 28.