The desire to have a "flat" network via "end-to-end" VLANs ran into issues with scalability, due mostly to the Spanning Tree algorithm.Due to its importance, the Spanning Tree protocol is discussed in great detail in this book, with two chapters spanning 136 pages devoted to its elucidation. It is introduced as a loop-prevention protocol that allows bridges to communicate with each other with the goal of discovering physical loops in the network.

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