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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
8/6/2019 CCNA 3 - LC-05-Chapter 5 Overview
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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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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
Summarize How STP works to EliminateLayer 2 Loops in a Converged Network
Describe the STP algorithm
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
Summarize How STP works to EliminateLayer 2 Loops in a Converged Network
Explain the role of the BPDU in STP
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
Summarize How STP works to EliminateLayer 2 Loops in a Converged Network
Explain the role of the BID in STP
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
Summarize How STP works to EliminateLayer 2 Loops in a Converged Network
Describe the how port roles support the operation ofSTP
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
Summarize How STP works to EliminateLayer 2 Loops in a Converged Network
Describe the role of STP port states and BPDU timersin the operation of STP
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
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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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
Explain How the STP Algorithm Uses Three
Steps to Converge on a Loop-Free Topology
Explain the STP decision sequence is used to elect aroot bridge for a network
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
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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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe the features of PVST+
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe the RSTP link types
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe how to configure rapid PVST+
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
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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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
Explain the Role of Redundancy in aConverged Switched Network
Describe the role redundancy in a hierarchical network
8/6/2019 CCNA 3 - LC-05-Chapter 5 Overview
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
Explain the Role of Redundancy in aConverged Switched Network
Describe how redundancy can disable a hierarchicalnetwork
8/6/2019 CCNA 3 - LC-05-Chapter 5 Overview
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
Explain How the STP Algorithm Uses Three
Steps to Converge on a Loop-Free Topology
Describe the process of electing a root port on a switch
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe the features of RSTP
8/6/2019 CCNA 3 - LC-05-Chapter 5 Overview
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe RSTP edge ports
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe the RSTP port states and port roles
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe how to design STP to avoid problems
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
Implement Rapid per VLAN SpanningTree (rapid PVST+) in a LAN
Describe how to identify and solve the key STPconfiguration issues
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2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
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
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