Use the up-arrow key to recall the show spanning-tree vlan 1 command and issue it repeatedly until the orange link light on the cable turns green.

Quickly return to the CLI prompt on switch S3 and issue the show spanning-tree vlan 1 command.ī. Step 2: Observe spanning-tree convergence.Ī. Select the delete tool from the menu bar and click the cable that connects S1 and S2. Open a CLI window on switch S3 and issue the command show spanning-tree vlan 1. Part 2: Observe spanning-tree convergence Step 1: Remove the connection between S1 and S2.Ī. Switching loops can degrade network performance and even cause a network to fail. If all ports could forward frames, a switching loop would exist in the network.

Why has spanning tree placed a port in blocking state? No frames are sent or received on that port. There main reason is that spanning tree has placed port G0/2 on S3 in blocking mode. What path will frames take from PC1 to PC2? It indicates that the port is not forwarding frames because it is in a spanning-tree state, in this case the blocking state. What do you think this this link light means? Packet Tracer uses a different link light on one of the connections between the switches. Switch Port Status (FWD, BLK…) Root Bridge? S1 G0/1 FWD No G0/2 FWD No S2 G0/1 FWD Yes G0/2 FWD Yes S3 G0/1 FWD No G0/2 BLK No The Fast Ethernet ports are access ports that have end devices connected and are not part of the interswitch trunk-based spanning tree. For the purposes of the activity, only consider information about the Gigabit trunk ports. Use the show spanning-tree vlan 1 command to gather information about the spanning tree status of each switch. Step 2: View spanning-tree status on each switch. Ping from PC1 to PC2 to verify connectivity between the hosts. Instructions Part 1: Observe a Converged Spanning-Tree Instance Step 1: Verify Connectivity. In this activity you will use Packet Tracer to observe the operation of Spanning Tree Protocol in a simple switched network that has redundant paths.

Explain how Spanning Tree Protocol prevents switching loops while allowing redundancy in switched networks.

Describe the operation of Spanning Tree Protocol.

In this lab, you will observe spanning-tree port states and watch the spanning-tree convergence process. 14.8.10 Packet Tracer – Investigate STP Loop Prevention Objectives

Packet tracer labs spanning tree