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Transcript

  • 1. CCNA 3 Chapter 8 Spanning Tree Protocol By Your Name
  • 2. Objectives
    • Redundant topologies
    • Spanning Tree Protocol
  • 3. Redundancy Redundant networking topologies are designed to ensure that networks continue to function in the presence of single points of failure.
  • 4. Redundant Topologies
    • A goal of redundant topologies is to eliminate network outages caused by a single point of failure.
    • All networks need redundancy for enhanced reliability.
  • 5. Redundant Switched Topologies
  • 6. Broadcast Storms
  • 7. Multiple Frames Transmission
  • 8. MAC Database Instability In a redundant switched network , it is possible for switches to learn the wrong information. A switch can learn that a MAC address is on a port when it is not.
  • 9. Spanning Tree Protocol
  • 10. Bridging Loops for Redundancy
  • 11. Spanning Tree
  • 12. Spanning-Tree Costs
  • 13. Spanning-Tree Operation
    • One root bridge per network .
    • One root port per nonroot bridge .
    • One designated port per segment .
    • Nondesignated ports are unused .
  • 14. Selecting the Root Bridge Bridge protocol data unit (BPDU)
  • 15. Spanning-Tree Port States
  • 16. Spanning-Tree Recalculation A switched internetwork has converged when all the switch and bridge ports are in either the forwarding or blocked state.
  • 17. Rapid Spanning Tree Protocol
    • Clarification of port states and roles
    • Definition of a set of link types that can go to forwarding state rapidly
    • Allowing switches, in a converged network, to generate their own BPDUs rather than relaying root bridge BPDUs
    The Rapid Spanning Tree Protocol, IEEE 802.1w, will eventually replace the Spanning Tree Protocol, IEEE 802.1D.