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ccna youtube.Switch-A(config)# spanning-tree vlan secondarySwitch B is configured similarly to the following.Switch-B(config)# spanning-tree mode rapid-pvst Switch-B(config)# spanning-tree vlan 2rootprimary Switch-B(config)# spanning-tree vlan 1rootsecondaryThe only difference between these two configurations is that Switch A's priority in both VLANs is primary and secondary, while Switch B's priority in both VLANs is secondary and primary respectively.Practical Exercise 13.1Figure 13.14 Optimized PVST+ and RSTPViewing STP Information on the SwitchThe previous sections discussed how STP works, and this experiment builds on that knowledge to let you see how STP works on the switch. For a diagram of the network used by the simulator, see the Preface section of this book. After starting the Bosoifs NetSim simulator, click the tab Labs in the lower left corner of the window, and then click the tab McGraw-Hill in the upper left corner (it is located to the right of the tabs Standard and Custom). Next, double-click Exercise13-1, which will load the experimental configuration from Chapter 12.1. on switch 2950-1 to confirm that you can pingHost-1 and switch 2950.2.Click on the LabInstructions tab and select 2950-1 from the drop-down list Devices, or click on the NetMap tab and double-click on the device icon 2950.1. go to the CLI for switch 2950-1 and execute the commands ping192.168.1.10 and ping192.168.1.3O Both actions should be successful. should be successful.