Hello, my name is Tyler McMinn with Aruba Networks, and this is the Networking Essentials video course Part one. We're rounding up the end here with a troubleshooting scenario, validating whether we can reach from one side of our network, PC- one to PC- four, whether it's going to work or not. Let's jump on in and see what's in store. Take a look at this PC- four. Let me ask you a question: If I have a second switch that is Aruba and I reboot it and I don't do anything, I don't log into it, it's a completely factory reset switch, which is what I believe this switch is and you've got PC- four booted up with this IP address, can I ping from PC-one across, the way our switch is set up now, and get a response back from PC- four, where PC- four could receive the ping, return it through its switch on one of these two links here, and return it back to PC- one, successfully? I'm about to do this. The question is, stop and think for a moment, is this going to work or is this going to fail? If it isn't going to work, if it's going to fail, then why would it fail? Let's take a look here: 10.251.12.4 from my PC- one. If I do a little show IP here, you can see that this switch is popping up here as 12.4, so it's ready to go and if you were paying attention closely, you may have seen that we tried this already. Let's see what happens. It fails. Why? What's the issue? Why did it actually end up failing out? If you haven't guessed, the issue is a layer one problem; it's actually at the access switch. I cannot reach the port on the 6300, and I can tell you that I can't reach it because when I do a show interphase brief, that's a great command to show you which of your ports are actually up and which of your ports are in a shutdown state. We can see that port one is up, port three is up, but the ports two and six are not enabled. Let's just enable one of those ports, configure terminal, on just one side; just on the left-hand side that we've been working with this entire time: interface one say six, we'll pop open the top one there. How do I bring that port up from being shut down? I say, No shutdown. Can I ping from PC- one, on the left-hand side, to PC- four, on the right? We'll do our ping here and the answer is, it works just fine. It was just simply a layer one issue. I said this on the very first video, when you plug these switches in, right out of the box, they are going to be ready to switch your traffic at layer one, layer two, all of the ports should be enabled, the ports should be enabling loop prevention with spanning tree which means one of these interfaces is going to be in a down state, it actually be this top one rather than the bottom one and therefore you're not going to have any issues with broadcast or range or anything else. As long as your computers are addressed in the same VLAN, the same subnet, will talk about that in the third part, you should have full reachability between these devices. Now we can't get out to the Internet, we can't route between different subnets but with everything in the same subnet, everything should be reachable and ready to go, assuming that we've actually gone through and enabled our switches. In this video, we covered some basic troubleshooting, trying to ping between PC- one and PC- four across our two access layer switches, one that we've been working with all along these different videos and the second one, which has just been factory reset as a 6,000 series switch, it should pop up as layer two switch ports, all the ports up and running, spanning tree solving this looping issue and we actually did get a successful ping once we fixed the ports that we ourselves had shut down in an earlier video. In the next part, we're going to take a deep dive into what the switching process actually looks like, some of the different protocols, like VLANs, spanning tree, even link aggregation to make our switching more robust and more scalable. That will lead us into Part three, the final section with Network Essentials, where we'll actually cover gateways, routing, static routes, and actually working with a dynamic routing protocol like OSPF. Thank you very much for your attention in this series of videos. My name is Tyler McMinn. I'll see you in the next set of videos.
