From its older brother IGRP which was developed in 1980s to overcome the limitations of RIP, EIGRP was an “Enhanced” IGRP protocol. The main purpose of EIGRP was to overcome the limitations of classful networks and make EIGRP a classless routing protocol. During designing of this protocol a different convergence algorithm was used making EIGRP that “hybrid” between distance-vector and link-state routing protocols. In this post we’ll go over a basic design and setup for EIGRP, however instead of using the “classic way” let’s look at configuring EIGRP using named mode which is available in Cisco IOS starting in version 15.2
Just wanted to put this up has Cisco has recently released VIRL. This is a network simulation platform that you can run Cisco operating systems on which are the same operating systems that run on Cisco hardware so anything you do in this simulation environment would be realistic if it was running on dedicated hardware. You would be able to test your changes before throwing them in production.
Some things that are different between VIRL and CML (Cisco Modeling Labs)
- CML is Cisco TAC supported so you can call Cisco. With VIRL you have community to help you out.
- You have cap of 15 devices with VIRL. The CML version capacity is dependent on the hardware its running on.
- CML is for the “Big Guys”, and way more expensive. VIRL is just for personal/training use. (i.e CCNA, CCNP, CCIE)
To be upfront I have not purchased VIRL so I can’t tell you my thoughts on the product itself but personally I think this is great way to learn and study Cisco certifications when looking at CCNP and even CCIE. This is way cheaper than buying hardware or renting rack space. The price is $199.99 a year and I would assume this would cover any updates the product has. Cisco is also selling an Academic Version for $79.99 a year with some extra terms attached to it.
I’m curious if anybody has any thoughts on VIRL, what advantages do you think this network simulation program (VIRL) has compared to GNS3? What do you think VIRL’s target audience is? Is this price too high? Finally do you think the product is too green? Are you going to buy it or wait and see?
When I started taking classes from the Cisco CCNA Discover books years ago, I remember for the first part of the book it talked about QoS and the theory behind it. To me QoS was a very interesting but after a chapter or two we never mentioned it again or really knew how to configure it. It seemed like it disappeared but it always something being tested on so we know it was there, somewhere… QoS can be a little boring and it does get a reputation of being difficult to understand, like where and how do I implement QoS? Most of the time QoS is not configured which causes applications to suffer in the end have an impact of end user performance. Throwing bandwidth to fix the problem is usually a costly risk, and remember you still may have the same performance problems. What also makes it interesting is you may have an environment that runs fine without QoS, so why do you need it? Well there’s no easy button to fix or find these unanswered questions about QoS. In this post I’m referencing guidelines of where to start looking which will hopefully help answer some of those unanswered questions. 🙂 Continue reading
Cisco recently published its 2014 Annual Security Report, and some interesting data was captured in 2013. One of the details was a talent gap in network security and because of this gap Cisco has a major revision in the CCNP Security certification starting in April. Its estimated that in short term or already present is shortage of more than a million security professionals worldwide! Continue reading
I have had the opportunity to take and thankfully pass Cisco certifications at the associate levels and there is one more associate exam, the CCNA Data Center which hopefully I will get later next year. While looking at the CCNA Data Center exam I also glanced over the professional arena that Cisco offers and if you’re like me I always like learning new things especially in technical field. Getting those “aha moments” once in a while makes it worth it, but beyond just over all knowledge of additional technologies why would you go on taking a professional Cisco cert? Continue reading