Oh…Spanning Tree

black and white cold fog forestIt’s the “S” word we don’t like to hear, and often times it has degraded networks or even took them down entirely.  (All Systems Down – an older but classic story) It’s also one of those things that nobody really likes, we even had network companies, as well as IEEE try to replace it with something else. Remember the names like TRILL, and IEEE 802.1aq (SPB) or Cisco’s FabicPath technologies? You had all of these different flavors that showed a lot progress, but they never really took off for one reason or another. The funny part is this protocol we are all trying kill off is still alive and doing well, so let’s look at spanning tree in the meantime because you will likely run into it.

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Cisco UCS Emulator 3.1(1ePE1)

If you are studying any Cisco Data Center certs this tool might come in handy for some hands on learning. The Cisco UCS emulator is a VM you can spin up in VMware Workstation,Fusion or in ESXi. This emulator can be helpful in understanding the UCS platform and UCS manager. You are able to push policies and alter configurations and even import/export these configurations into and out of the “real” world to apply them/test them. You can download this emulator from Cisco’s Community site: Cisco UCS Platform Emulator 3.1(1ePE1) Downloads All you need is a Cisco ID to sign in which is free to register and download.

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Passed the 640-911 DCICN

Cisco started this exam back in 2012 and I have thought/semi-studied about this test for about over a year now, just did not feel comfy about it until recently. I took the test last week and passed, however there were some questions on the exam I noticed that weren’t on the exam blueprint so that kind of surprised me. I was happy to still be able to pass the exam but I was caught off guard. So with that I’ll let you know what I used to study and what areas I think might help so you won’t be as “surprised” as I was. Continue reading “Passed the 640-911 DCICN”

Setting up Enhanced vPC on Nexus 5600

So I’ve played around with two Cisco Nexus 5672UP switches which will be in production soon but before that I wanted to see what it took to get enhanced vPC online. Along the way I was into some new territory as I never stood up vPC before, so in this post I have posted some things to keep in mind and running-config examples, all of which I hope is helpful for a reference. Continue reading “Setting up Enhanced vPC on Nexus 5600”

Inter-VLAN Routing on the Nexus 5k.

Nexus-PLineI previously had the chance to play around with the 5596UP switch, and made some notes on how to configure inter-vlan routing. Since this was a 5596UP switch I needed a layer 3 card to take advantage of it. The next-generation units the 5600 include layer 3 without a card required along with introducing 40GB uplinks! However in this post let’s go back to the basics and configure inter-vlan routing on a nexus switch and in this case I am using a 5596UP.  Continue reading “Inter-VLAN Routing on the Nexus 5k.”