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Donotsave your configuration at any point during this task. You willreboot at the end to return to the correct configuration.Windows clientAccess the client desktop and open a command prompt.Establish a continuous ping to the server.ping 10.1.11.11 –tAccess-1Access the terminal session with Access-1 and move to the globalconfiguration context.Remove VLAN 12 from the links to Core-1 and Core-2.Access-1(config)#no vlan 12 tagged 5,7Assign Access-1 priority multiplier 4 (priority 16384) in each instance.The issue that you want to observe might or might not occur dependingon which access layer switch is selected as being closer to the root, whichoften depends on MAC address in a real network. For this experiment,you want to make sure that Access-1 is selected so that you can be sure tosee the potential issue.Access-1(config)#spanning-tree priority 4Access-1(config)#spanning-tree instance 1 priority 4Access-1(config)#spanning-tree instance 2 priority 4Access-2Access the terminal session with Access-2 and move to the globalPass4sure - #1 IT Certifications Materials Provider
8.9.10.11.12.configuration mode.Remove VLAN 11 from the links to Core-1 and Core-2.Access-2(config)#no vlan 11 tagged 5,7Windows clientCheck the ping.As you see, at this point, the ping continues normally. During normaloperation for this topology, Access-1 does not need to be part of VLAN12 and Access-2 does not need to be part of VLAN 11.Core-1Now observe what happens if the link between Core-1 and Core-2 fails.Access the terminal session with Core-1.Shut down the port that connects to Core-2.Core-1(config)#interface a19 disableWindows clientView the ping on the client. After a moment, the ping begins failing. Whydid the failover not occur properly? (If you do not know, do not worry.The following steps help you to discover the problem.)Core-1The client needs to reach Core-1, its default gateway in VLAN 12. VLAN12 is associated with instance 2. Which link is active on Core-1 ininstance 2? View the port roles on Core-1 in instance 2 to find out.Enter this command:Pass4sure - #1 IT Certifications Materials Provider
13.14.15.ccess-1The root port on Core-1 connects to Access-1. Does the link betweenCore-1 and Access-1 carry VLAN 12? To remind yourself, view VLANson port 5 on Access-1.ou see, the active link does not carry VLAN 12. Therefore, the clientot reach its default gateway, causing a disruption in connectivity.e-1Re-enable the port on Core-1.-1(config)#interface a19 enableess-1 and Access-2Reboot the Access-1 and Access-2 switches using thereloadcommand.Donotsave the configuration.ndows clientthe continuous ping on the PC with <Ctrl+c>.Pass4sure - #1 IT Certifications Materials Provider
Explanation of Task BMSTP uses asingleBPDU, which is backward compatible with RSTP andalso includes MSTP instance information within it. This approach has theadvantage of causing minimal impact on the switch’s CPU; only one BPDUmust be processed. However, it also introduces some important implications,which you must understand.

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Fall
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Network switch, Certifications Materials Provider

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