CCNA Exploration 3 - Chapter 5

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CCNA Exploration 3 - Chapter 3

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CCNA Exploration 3 - Chapter 5

  1. 1. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1Version 4.0 Implement Spanning Tree Protocols LAN Switching and Wireless – Chapter 5
  2. 2. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2 Objectives  Explain the role of redundancy in a converged network  Summarize how STP works to eliminate Layer 2 loops in a converged network  Explain how the STP algorithm uses three steps to converge on a loop-free topology  Implement rapid per VLAN spanning tree (rapid PVST+) in a LAN to prevent loops between redundant switches.
  3. 3. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3 Explain the Role of Redundancy in a Converged Switched Network  Describe the role redundancy in a hierarchical network
  4. 4. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4 Explain the Role of Redundancy in a Converged Switched Network  Describe how redundancy can disable a hierarchical network
  5. 5. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5 Explain the Role of Redundancy in a Converged Switched Network  Explain how Layer 2 loops occur in well managed networks
  6. 6. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6 Summarize How STP works to Eliminate Layer 2 Loops in a Converged Network  Describe the STP algorithm
  7. 7. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7 Summarize How STP works to Eliminate Layer 2 Loops in a Converged Network  Explain the role of the BPDU in STP
  8. 8. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8 Summarize How STP works to Eliminate Layer 2 Loops in a Converged Network  Explain the role of the BID in STP
  9. 9. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9 Summarize How STP works to Eliminate Layer 2 Loops in a Converged Network  Describe the how port roles support the operation of STP
  10. 10. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10 Summarize How STP works to Eliminate Layer 2 Loops in a Converged Network  Describe the role of STP port states and BPDU timers in the operation of STP
  11. 11. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11 Explain How the STP Algorithm Uses Three Steps to Converge on a Loop-Free Topology  Define convergence for a switched network and summarize the 3 step process STP uses to create a loop free topology
  12. 12. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12 Explain How the STP Algorithm Uses Three Steps to Converge on a Loop-Free Topology  Explain the STP decision sequence is used to elect a root bridge for a network
  13. 13. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13 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
  14. 14. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14 Explain How the STP Algorithm Uses Three Steps to Converge on a Loop-Free Topology  Describe the process of electing designated ports and non-designated ports on a switch
  15. 15. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Summarize the features of the PVST+, RSTP and rapid PVST+ variants of STP
  16. 16. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe the features of PVST+
  17. 17. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe the features of RSTP
  18. 18. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe RSTP edge ports
  19. 19. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe the RSTP link types
  20. 20. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe the RSTP port states and port roles
  21. 21. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe how to configure rapid PVST+
  22. 22. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe how to design STP to avoid problems
  23. 23. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23 Implement Rapid per VLAN Spanning Tree (rapid PVST+) in a LAN  Describe how to identify and solve the key STP configuration issues
  24. 24. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24 Summary  Spanning Tree Protocol (STP) is used to prevent loops from being formed on redundant networks  STP uses different port states & timers to logically prevent loops  There is at least one switch in a network that serves as the root bridge Root bridge is elected using information found in BPDU frames  Root ports are determined by the spanning tree algorithm and are closest to the root bridge
  25. 25. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25 Summary  STP lengthy convergence time (50 seconds) facilitated the 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
  26. 26. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26

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