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In this lab, we are going to continue configuring our campus network.                                                                                                                                                

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We've been asked to use both CDP or Cisco Discovery Protocol and LLDP or Link-Layer Discovery Protocol

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to verify links.

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So we need to check the links between the devices and confirm that the links are correctly configured

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per the diagram. We need to verify which ports are forwarding and blocking in spanning tree

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and then we need to optimize spanning tree with core 1 being the root for odd VLANs and core

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2 being the root for even VLANs.

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So have a look at this topology package trace and makes this easy which links are currently blocking

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in spanning tree.

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Can you see which ports are blocking notice on call one of these ports or blocking and spanning tree

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on access 1.

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This port is blocking in spanning tree. Now think about the problem.

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If a large amount of traffic was sent from many PCs in VLAN 10 on this access switch to this server.

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How would traffic flow? Traffic would have to go across this uplink to Core 2 and then use this single

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gigabit 1 0 23 link to core 1 to get to the server.

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Now imagine that you had many servers here as well as many PCs on switch 2 and switch 3 trying to

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get to a group of servers on the left end side. Let's say they were moving large files.

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How would traffic flow? So traffic from all of these PCs in VLAN 10 20 and 30 would end up going

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via core 2 and then going across the single link to core 1 to get to these servers.

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These links are being blocked by spanning tree so no traffic will go from VLAN 20 to core 1 all the

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traffic will go to core 2 to get to the servers on the left end side.

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That's gonna be a problem because we're gonna have a bottleneck or an issue on gigabit 1 0

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23 this is a gigabit port but all of these uplinks are also gigabit ports and PCs are sending

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traffic at gig speeds. So if you have 100 PCs sending traffic to multiple servers this gigabit

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1 0 23 link is gonna be over saturated.

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In other words, there's gonna be too much traffic for that single link.

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So we want to optimize our spanning tree and this topology and ensure that core 1 is the route for odd VLANs

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and core2 is the root for even VLANs.

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In other words core 1 will be the root for VLAN 1 VLAN 10 and VLAN 30, core 2 will be the root

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for VLAN 20 and VLAN 100.

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So we're going to split traffic across the core switches.

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You also need to configure ether channel on the core switches so that we don't have one of these links

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blocking, both of these ports should be forwarding. So to do that we're gonna use ether channel.

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We also need to configure IP addresses on the core switches to enable inter VLAN routing.

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Here are the IP addresses of core 1.

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Here are the IP addresses of Core 2 and you need to configure IP addresses on the access switches in

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VLAN 1. In the next lab

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after this we'll configure IP addresses in the PCs and verify connectivity in our campus network

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to ensure that things are working right.

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So this is a big lab.

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Are you able to do it yourself

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Download the attached packet tracer file and try and configure the lab yourself or you can watch

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me in the next video complete this lab.

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Best way to learn is to try things so try it.

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If you get stuck,

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Have a look at to the videos to help you.