Chapter 13th Spanning Tree Protocol

A local area network is usually connected by multiple switches, in order to avoid broadcast storms, we need to ensure that there is no path loop in the network, that is, all links should be composed of a non-loopback tree, the switch on the STP (Spanning Tree protocol) to achieve such a function. In this chapter we will first learn some of the basic concepts of the STP protocol, and how the STP protocol realizes a dynamic spanning tree by realizing the blocking and opening of the redundant link, and finally we will introduce the RSTP (fast Spanning Tree Protocol) and the MSTP (multi spanning Tree Protocol). And how to configure the spanning tree on the switch.

STP generates background

Impact of Path loopback

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In a switched network, the bridge does not make any modifications to the Ethernet data frame, and the frame does not record the exact number of bridges. If the network small red existence loop, the frame may continuously circulate and proliferate in the loop, causes the network bandwidth to occupy by the massive repetition frame, causes the network to be congested.

is an example of looping and hyperplasia of data frames due to loops.

Chapter 13th Spanning Tree Protocol