Digging deep into Unified Communications from Spain.
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First Month Done!

July 26th, 2012 | Posted by Jaime Diez in CCIE Voice - (0 Comments)

As the tittle says, I started one month ago to study really hard to achieve the CCIE Voice certification. I have spent a few minutes every week to do self-analysis to see what things are working, and what things are not working like I expected. That is the way I can improve my own “processes” to be more efficient with my time.

Things that I have changed during this time:

  1. I have made some minor changes to my initial schedule, but the total number of hours per week, remain the same.
  2. I received my latest phone 3 weeks ago, so I have had to play Tetris to place all of the phones on my table close to me in a comfortable way. So now I have 4x 7961, 1x 7960 and 1×7962. I put them together to take the picture below (sorry, I am a bad photographer).

  3. I have configured US Eng language in all my keyboards to get used to the positions of symbols, which is quite different from the spanish one. I do not want to waste time or get nervous because of that during the lab day. After one month, I am able to configure at the same speed as before, in fact I now have to think  for a second, if I am typing with the Spanish configuration. I have noticed that some people even buy keyboards with the US layout, but since I do not need to look at the keyboard, it is not necessary for me.
  4. I am using PuTTY and SecureCRT either way to be familiarized with both since it is not clear for me which will be on the lab exam.
  5. I am documenting everything, although it seems really obvious. I intend not just to pass the exam but to retain the knowledge, and at the same time elaborate in very detailed notes for the future. You never know when are you going to use a feature again; it could take months hence you could forget it.

The purpose of all these little details is to try to make the lab day like any other day, to be focused on the important tasks and to avoid any headache over things you don’t expect.

I didn’t know how to approach this post because of its depth; therefore, I thought that giving an example would be a good idea keeping the post short and just as a brief reference on how to configure QoS. So, here I go.

Before you continue reading, you should have a good understanding of the QoS stages and the different mechanisms, because I am not going to explain the theory which can be found on my previous post.

The whole configuration posted here is based on the Cisco Catalyst 3750 which is on the lab exam.

I always keep in mind the stages to follow the same steps while I am configuring.

Classification > Policing/Marking > InputQ Mapping/Input queuing > Ingress scheduling > Stack Ring > OutputQ mapping/Output queuing > Egress Scheduling

Bellow a little diagram that it is always easier to remember and understand.

QoS Catalyst 3750 Continue reading…

Campus infrastructure and QoS

July 7th, 2012 | Posted by Jaime Diez in Cisco - (0 Comments)

During these last two weeks I have been dealing with the campus infrastructure, VLAN, DHCP, TFTP and NTP, brushing up on some concepts, and also with QoS, which has taken me most of my time. QoS was the topic in which I had the less experience, but now, I can say that I understand it and know how it works perfectly.

In this post I will just show you the guides and documents that I am using. Next week I will post again with some examples and notes.

Regarding VLAN, DHCP, TFTP and NTP protocols, if you are pursuing the CCIE Voice, like I am, you should be quite familiarized with these, but it is worth it to have a look at the SRND to refresh best practices

Cisco SRND CUCM 7.x

Try these links in case you need to check any example, commands, or ways to configure something:

Cisco IOS 12.4T

Catalyst 3750 12.2(44) Configuration Guide

Catalyst 3750 12.2(44) Command Reference Guide

Regarding QoS, you should read the following to get the expert level:

Cisco SRND QoS

QoS section in the Catalyst 3750 Configuration Guide

QoS section in the Medianet Reference Guide

Cisco QoS Command Reference

Here you have some useful examples:

Cisco Catalys 3750 QoS configuration examples

In the following link, you can see an animation to make understanding easier.

QoS animation

In a lab environment sometimes is difficult to simulate congestion, therefore you have better know the behaviour of every command that you type because you will just be able to “test” it in your mind.

I also have been watching some videos which have been really useful to learn some tips and new ways to do things.

This is a short post but deep in content.