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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 4: Spanning Tree Protocol (STP)

Exam Objectives

Describing problems related to switching loops and seeing how STP fixes them

Describing STP operation flow, root bridge, and nonroot bridge functions

Managing STP root bridge selection

Managing STP port type assignment

Describing the STP convergence process

Describing the STP port states

Understanding best practices to decrease STP convergence duration

Managing Cisco switch and port configuration options for STP

Describing Rapid Spanning Tree Protocol (RSTP) improvements over STP

Describing and managing EtherChannel

You found out in previous chapters that switches are very often interconnected using redundant links to improve reliability of interswitch links. You also discovered that redundant links can create transmission loops, causing broadcast storms and MAC address table thrashing. Switches need to avoid transmissions loops when they are interconnected using redundant links.

Read this chapter to see how the Spanning Tree Protocol (STP) (IEEE 802.1d) can be used to help Layer 2 switches avoid loops. You see how to configure and manage STP. You are also introduced to STP port types. The convergence process flow is explained, along with some parameters you can set to control STP convergence. Finally, you see how the Rapid Spanning Tree Protocol (RSTP) (IEEE 802.1w) improves STP convergence speed.

Introducing the Spanning Tree Protocol (STP)

Layer 2 switches need to avoid switching loops. Here you see how switches can avoid ...

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