CCNA 3 - LC-05-Chapter 5 Overview

8/6/2019 CCNA 3 - LC-05-Chapter 5 Overview

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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1Version 4.0

Implement SpanningTree Protocols

LAN Switching and Wireless Chapter 5


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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2

Explain the Role of Redundancy in aConverged Switched Network

Explain how Layer 2 loops occur in well managednetworks


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Summarize How STP works to EliminateLayer 2 Loops in a Converged Network

Describe the STP algorithm


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Explain the role of the BPDU in STP


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Explain the role of the BID in STP


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Describe the how port roles support the operation ofSTP


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Describe the role of STP port states and BPDU timersin the operation of STP


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Explain How the STP Algorithm Uses Three

Steps to Converge on a Loop-Free Topology

Define convergence for a switched network andsummarize the 3 step process STP uses to create aloop free topology


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Explain the STP decision sequence is used to elect aroot bridge for a network


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Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN

Summarize the features of the PVST+, RSTP and rapidPVST+ variants of STP


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Describe the features of PVST+


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Describe the RSTP link types


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Describe how to configure rapid PVST+


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Objectives

Explain the role of redundancy in a convergednetwork

Summarize how STP works to eliminate Layer 2 loopsin a converged network

Explain how the STP algorithm uses three steps toconverge on a loop-free topology

Implement rapid per VLAN spanning tree (rapidPVST+) in a LAN to prevent loops between redundantswitches.


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Describe the role redundancy in a hierarchical network


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Describe how redundancy can disable a hierarchicalnetwork


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Describe the process of electing a root port on a switch


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Describe the features of RSTP


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Describe RSTP edge ports


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Describe the RSTP port states and port roles


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Describe how to design STP to avoid problems


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Describe how to identify and solve the key STPconfiguration issues


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Summary

Spanning Tree Protocol (STP) is used to prevent loopsfrom being formed on redundant networks

STP uses different port states & timers to logicallyprevent loops

There is at least one switch in a network that serves asthe root bridge

Root bridge is elected using information found in BPDU frames

Root ports are determined by the spanning treealgorithm and are closest to the root bridge


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Summary

STP lengthy convergence time (50 seconds) facilitatedthe development of:

RSTP

convergence time is slightly over 6 seconds

Rapid PVST+

adds VLAN support to RSTP

is the preferred spanning-tree protocol on a Cisco switch

netowrk

Documents

CCNA 3 - LC-05-Chapter 5 Overview