Lecture CCNP Switch: Implementing IP switching - Chapter 3: Implementing Spanning Tree

Spanning Tree Protocol is a fundamental protocol to prevent Layer 2 loops and at the same time provide redundancy in the network. This chapter covered the basic operation and configuration of RSTP and MST. | Chapter 3: Implementing Spanning Tree CCNP SWITCH: Implementing IP Switching 1 Cisco Networking Academy Program CCNP SWITCH: Implementing IP Switching Chapter 3: Implementing Spanning Tree Chapter 3 Objectives Describe spanning tree protocols. Describe and configure RSTP. Describe and configure MST. Configure STP features to enhance resiliency and prevent forwarding loops. Explain recommended STP configurations and practices. Troubleshoot spanning tree issues. 2 Chapter 3 Objectives Spanning Tree Protocol Basics STP uses the concepts of root bridges, root ports, designated, and non-designated ports to establish a loop-free path through the network. STP forces certain ports into a standby state so that they do not listen to, forward, or flood data frames. The overall effect is that there is only one path to each network segment that is active at any time. If there is a problem with connectivity to any of the segments within the network, STP or RSTP reestablishes connectivity by . | Chapter 3: Implementing Spanning Tree CCNP SWITCH: Implementing IP Switching 1 Cisco Networking Academy Program CCNP SWITCH: Implementing IP Switching Chapter 3: Implementing Spanning Tree Chapter 3 Objectives Describe spanning tree protocols. Describe and configure RSTP. Describe and configure MST. Configure STP features to enhance resiliency and prevent forwarding loops. Explain recommended STP configurations and practices. Troubleshoot spanning tree issues. 2 Chapter 3 Objectives Spanning Tree Protocol Basics STP uses the concepts of root bridges, root ports, designated, and non-designated ports to establish a loop-free path through the network. STP forces certain ports into a standby state so that they do not listen to, forward, or flood data frames. The overall effect is that there is only one path to each network segment that is active at any time. If there is a problem with connectivity to any of the segments within the network, STP or RSTP reestablishes connectivity by automatically activating a previously inactive path, if one exists. 3 Spanning Tree History STP was invented in 1985 by Radia Perlman at the Digital Equipment Corporation. In 1990, IEEE published the first standard for the protocol as . Common Spanning Tree (CST) -> Cisco PVST+ -> Rapid STP (RSTP) or IEEE -> Cisco PVRST+ -> Multiple Spanning Tree (MST) or IEEE -> STP security enhancements The first STP, called the DEC STP, was invented in 1985 by Radia Perlman at the Digital Equipment Corporation. In 1990, the IEEE published the first standard for the protocol as based on the algorithm designed by Perlman. Subsequent versions were published in 1998 and 2004 incorporating various extensions. Common Spanning Tree (CST) assumes one spanning-tree instance for the entire bridged network, regardless of the number of VLANs. Because there is only one instance, the CPU and memory requirements for this version are lower than the others. However, because there is only

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