The document discusses spanning tree protocol (STP) which is used to prevent loops and enable redundancy in switched networks. STP designates one switch as the root bridge and elects root ports and designated ports to block ports and create a loop-free topology. STP also defines port states like forwarding, blocking, listening and learning. Rapid spanning tree protocol (RSTP) was introduced to improve upon STP by providing faster convergence when the network topology changes.

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.