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Changing the IP for a CUCM cluster

June 18th, 2012 | Posted by Jaime Diez in Cisco - (0 Comments)

Lately I have had to change the network parameters for a CUCM cluster, this is not a day-to-day task, because of that I going to show you how to change it to avoid any major issue.

As a network parameter, it should be done during a time window out of business hours. As you would do with any other operation, verify the proper operation of the CUCM cluster before make any change, make a backup and have a rollback plan to use in case that something goes wrong.

You will find a guide from Cisco which is a good point to start and covers all the process but I like to have always my own documentation in addition to other, to have my own notes. It helps me to remember important details and issues that I have had, the purpose is to have the whole experience write down.

Let’s start the task, it is very important to follow this order to avoid any error. You will have to request a new license file re-issued  by Cisco to use it after the change. Start making all the changes on the publisher and after that with the subscribers.
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I can say that my ESXi server is the heart of my lab, so before I got everything, I was doing some research to get the best deal. The easiest way to get it built, is to follow the VMware hardware guide to get a supported server, but it means a higher price and maybe, pointless features for our purpose like redundant PSUs. On the other hand, you will, unlike me, save some headaches with the supported path. I like challenges!

In my case, I wanted something small with support for VM Direct Path and of course, all the hardware embedded on the motherboard. Based on those prerequisites, I found the Asrock Z68 Pro3-M, a micro-ATX form factor motherboard.

Hardware list:

– Motherboard: Asrock Z68 Pro3-M (Graphics and NIC on-board)

– CPU: Intel Core i5-2500 (note that is the non-K version, to take advantage of the virtualization features)

– RAM: 4x8Gb G.Skill Ares

– Case: Cooler Master Elite 342 MicroATX

– PSU: Tacens Radix V 450W

– HD: 1x Samsung SSD 830 128Gb – 4x2TB Seagate ST2000DL003

– Extra: Intel pci NIC.

Considerations

I boot ESXi 5.0 from a USB pen drive and without doing anything, everything is recognized, the NIC Realtek RTL8111E included.

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A brief review of my home lab

May 9th, 2012 | Posted by Jaime Diez in Cisco | Lab | Lync - (0 Comments)

In this first entry, I’m going to show you the curent layout of my lab, I say current because I’m always introducing new elements and making changes. My goal here is to have (almost) the same things that you can find in the real world and in most of  enterprise environments.

Despite the constant changes, the network is always the same with a WAN, LAN and DMZ well-defined. Let’s show you a picture in general.

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