User`s guide

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greater the probability the port will be chosen to forward packets.
3. Illustration of STP
A simple illustration of three switches connected in a loop is depicted in Figure 5-7. In
this example, you can anticipate some major network problems if the STP assistance
is not applied. If switch A broadcasts a packet to switch B, switch B will broadcast it to
switch C, and switch C will broadcast it to back to switch A ... and so on. The
broadcast packet will be passed indefinitely in a loop, potentially causing a network
failure. In this example, STP breaks the loop by blocking the connection between
switch 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 switch A broadcasts a
packet to switch C, then switch 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.
Figure 2-19 before Applying the STA Rules
In this example, only the default STP values are used.