Fast Spanning Tree protocol

"Experiment Name"
The configuration of the fast spanning Tree protocol RSTP.
"Experimental Purpose"
Understand how the fast spanning Tree protocol RSTP works and how to configure a fast spanning tree on a switch.
"Background description"
A school in order to carry out computer teaching and network office, the establishment of a computer classroom and a school office area, the two
Network through the interconnection of two switches to form an internal campus network, in order to improve the reliability of the network administrator
Interconnect the switch with 2 links, and now configure the switch appropriately so that the network avoids loops.
"Demand Analysis"
Two switches with dual-link interconnection, need to enable RSTP to avoid loops, while providing redundant backup
Yes.
"Experimental Topology"
Figure 4‐1 Experimental topological diagram
When connecting to the network according to the topology diagram, note that when both switches are configured with RSTP, the two switches are connected
To. If the first line reconfiguration may cause a broadcast storm, it will affect the normal operation of the switch.
"Experimental Equipment"
Three-layer Switch 1 units
Two-layer switch 1 units
"Pre-knowledge"
Basic configuration method of the switch, how Trunk works and how to configure it, how to configure the SVI port, spanning tree
How the RSTP works and how to configure it
"Experimental principle"
Spanning-Tree Protocol (SPANNING-TREE), which provides redundant backup links in a switched network, and addresses the switching networks
The loop problem in the network.
Spanning tree protocol is the use of the SPA algorithm (spanning tree algorithm) to generate a non-ring in a network that has a switching loop
A tree-shaped network of roads. By using this algorithm, the backup link of the Switched network redundancy is logically disconnected, and when the main link fails,
can automatically switch to the backup link to ensure the normal forwarding of data.
Spanning Tree protocol is currently a common version of STP (Spanning Tree Protocol IEEE 802.1d), RSTP (Fast spanning Tree Association
IEEE 802.1w), MSTP (Multi Spanning Tree Protocol IEEE 802.1s).
Spanning tree protocol is characterized by a long convergence time. When the primary link fails, the switch to the backup link requires
Time of 50 seconds.
The Fast Spanning Tree Protocol (RSTP) adds two port roles based on the Spanning Tree protocol: replacement Port
(alternate port) and the backup port (the root port), respectively, and the specified port (designated
Port) for redundant ports. When a root port or a specified port fails, redundant ports do not need to converge for 50 seconds
, you can switch directly to the replacement port or the backup port. Thus, the RSTP protocol is less than 1 seconds fast convergence.

"Experimental Process"

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Fast Spanning Tree protocol