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Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide by Wendell Odom

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Chapter 2. Spanning Tree Protocol Implementation

Cisco LAN switches enable Spanning Tree Protocol (STP) by default on all interfaces in every VLAN. However, network engineers who work with medium-size to large-size Ethernet LANs usually want to configure at least some STP settings, with the goal of influencing the choices made by STP. For instance, a network engineer configures so that, when all switches and links work, the engineer knows which switch is the root and which ports block. The configuration can also be set so that when links or switches fail, the engineer can predict the STP topology in those cases, as well.

This chapter discusses the configuration options for STP, assuming the switches use 802.1D STP. The first major section weaves ...

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