Oct
01
From all of us here at INE we would like to congratulate Petr on his CCDE success.  The CCDE is one of Cisco's most difficult and sought after certifications.  Leveraging the knowledge from his four existing CCIE's, Petr spent over 6 months of non-stop reading, thinking and analyzing network design solutions and pitfalls.  Blogging and participating in INE's amazing student community on IEOC greatly aided him in articulating and developing an understanding the complex topics necessary to pass... Read More
Sep
26
Practical Exam Overview The practical test is a series of design scenarios. At the beginning of every scenario, you are given the existing network design information (diagrams, background, applications, business plans etc). After this, you are presented with a particular technical problem - e.g. a problem in the existing design that you need to fix, or a requirement to scale the existing network, or possibly a scenario where you have to spin off another network from existing one. You are then... Read More
Sep
21
The below is a compilation of the blost posts I made over time and that seemed to be helpful based on the feedback I received. I noticed a lot of blog visitors walking through our archives looking for the information. Hopefully, this compilation will help navigating our blog better. Feel free to post your feedback and suggestions! IP Routing Troubleshooting Multicast Routing Understanding Third-Party Next-Hop A High-Level Overview of LISP OSPF Fast Convergence A Simple IPv4 Prefix Summarization... Read More
Sep
02
Abstract This publication briefly covers the use of 3rd party next-hops in OSPF, RIP, EIGRP and BGP routing protocols. Common concepts are introduced and protocol-specific implementations are discussed. Basic understanding of the routing protocol function is required before reading this blog post. Overview Third-party next-hop concept appears only to distance vector protocol, or in the parts of the link-state protocols that exhibit distance-vector behavior. The idea is that a distance-vector... Read More
Aug
16
Abstract In this blog post we are going to review a number of MPLS scaling techniques. Theoretically, the main factors that limit MPLS network growth are: IGP Scaling. Route Summarization, which is the core procedure for scaling of all commonly used IGPs does not work well with MPLS LSPs. We’ll discuss the reasons for this and see what solutions are available to deploy MPLS in presence of IGP route summarization. Forwarding State growth. Deploying MPLE TE may be challenging in large network as... Read More
Jun
02
This goal of this post is brief discussion of main factors controlling fast convergence in OSPF-based networks. Network convergence is a term that is sometimes used under various interpretations. Before we discuss the optimization procedures for OSPF, we define network convergence as the process of synchronizing network forwarding tables after a topology change. Network is said to be converged when none of forwarding tables are changing for "some reasonable" amount of time. This "some" amount... Read More
May
24
As my 4-year recertification timeline was about to lapse, I had to go and pay $350 to recertify :) There was no other challenge, as I picked CCDE written for recertification, keeping in mind to take the practical test again this year. To my greatest surprise, the exam was almost the same it was in September 2007, when I took the beta version. Just this time the number of questions was 100 not 170 and they give you chance to review and navigate among the questions (just like it was in old CCIE... Read More
Jan
26
Our blog site continues to skyrocket in viewers and active participants. Thank you so much for supporting this site and reading and commenting on what we have to say. We love to teach and WRITE, and without your support, the blog WRITING part would certainly be wasted. ☺ One of the things I keep noticing about our blog is Cisco questions pretty unrelated to a particular blog in the comments for a certain post. I wanted to take this opportunity to remind all of our readers about a powerful... Read More
Jan
02
In this post I will try to summarize the things known so far about the CCDE written/practical exams and provide some (hopefully) useful tips and hint. Even though I didn’t receive my exam results yet, I think it’s still a good idea. At least, I’m still the person who “tried” and haven’t “failed” yet (at least unaware of that :) The first question that people ask – would getting CCDA and CCDP help in achieving CCDE? That would help, a little. Most useful thing would be summarization your... Read More
Oct
02
Well, I figure it's my turn to write something about the CCDE exam that, as Brian M. noted, he, Petr and I suffered through.... errrr...  took yesterday!   :) Read More

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