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C
HAPTER
6: S
PANNING
T
REE
P
ROTOCOL
(STP)
Figure 13
Network with an illegal topology
This configuration is illegal because it creates loops that cause the
network to overload. However, STP allows you to use this configuration
because STP detects duplicate paths and immediately prevents (or
blocks
)
one of them from forwarding traffic.
Figure 14
shows an example of enabling STP on the bridges in the
configuration. The STP system has decided that traffic from LAN segment
2 to LAN segment 1 can only flow through Bridges C and A.
Figure 14
Traffic flowing through Bridges C and A