CCNA Exploration 3 - Chapter 5
7 likes2,845 views
This document discusses spanning tree protocols (STP) and how they are implemented to prevent loops in switched networks. It covers how STP works by electing a root bridge and designating port roles and states. STP uses BPDU frames and a three step process to converge on a loop-free topology. The document also describes rapid per VLAN spanning tree (rapid PVST+), a variant of STP that provides faster convergence time and VLAN support compared to older STP standards. Rapid PVST+ is recommended for use on Cisco switched networks to prevent loops.
CCNA Exploration 3 - Chapter 5
- 1. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1Version 4.0 Implement Spanning Tree Protocols LAN Switching and Wireless – Chapter 5
- 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 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. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26