| This chapter covers the following topics that you need to master for the CCNP BCMSN exam: IEEE 802.1D Overview This section discusses the original, or more traditional, Spanning Tree Protocol (STP). This protocol is the foundation for the default Catalyst STP and for all the enhancements that are described in Chapters 10, "Spanning Tree Configuration," through 12, "Advanced Spanning Tree Protocol." Types of STP This section discusses other types of STP that might be running on a Catalyst switchspecifically, the Common Spanning Tree, Per-VLAN Spanning Tree (PVST), and PVST+.
Previous chapters covered robust network designs where redundant links are used between switches. Although this increases the network availability, it also opens up the possibility for conditions that would impair the network. In a Layer 2 switched network, preventing bridging loops from forming over redundant paths is important. Spanning Tree Protocol (STP) was designed to monitor and control the Layer 2 network so that a loop-free topology is maintained. This chapter discusses the theory and operation of the STP. More specifically, the original, or traditional, STP is covered, as defined in IEEE 802.1D. Several chapters explain STP topics in this book. Here is a brief roadmap so you can chart a course: Chapter 9, "Traditional Spanning Tree Protocol" Covers the theory of IEEE 802.1D Chapter 10, "Spanning Tree Configuration" Covers the configuration commands needed for IEEE 802.1D Chapter 11, "Protecting the Spanning Tree Protocol Topology" Covers the features and commands to filter and protect a converged STP topology from conditions that could destabilize it Chapter 12, "Advanced Spanning Tree Protocol" Covers the newer 802.1w and 802.1s enhancements to STP, allowing more scalability and faster convergence
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