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What is STP?
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Figure 5
A network configuration that creates loops
Figure 6 shows the result of enabling STP on the bridges in the
configuration. STP detects the duplicate paths and prevents, or
blocks
,
one of them from forwarding traffic, so this configuration will work
satisfactorily. STP has determined that traffic from LAN segment 2 to LAN
segment 1 can only flow through Bridges C and A, because, for example,
this path has a greater bandwidth and is therefore more efficient.
Figure 6
Traffic flowing through Bridges C and A
If a link failure is detected, as shown in Figure 7, the STP process
reconfigures the network so that traffic from LAN segment 2 flows
through Bridge B.