Introducing Spanning Tree Protocol
Introducing Spanning Tree Protocol
As with traditional shared Ethernet, transparent bridges
inherently lack the capability to provide redundancy. The Spanning Tree Protocol
(STP) inserts a mechanism into the Ethernet transparent bridge environment to
dynamically discover the network topology and ensure only one path through the
network. Without STP, there is no way to make a transparent bridge environment
redundant. STP also protects a network against accidental miscablings because it
prevents unwanted bridging loops in the transparent bridging environment. A
bridge loop is similar to a wrestling match. At first, everything appears
orderly, but pandemonium soon ensues. The normal referee and rules do not work.
The pandemonium does not stop until someone comes in and shuts the match down.
Bridge loops in Ethernet and transparent bridging also cause pandemonium. Figure 1-13 shows a bridge loop in
Ethernet. |
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