Jul
31
In this short article we'll take a look at Cisco IOS static multicast routes (mroutes) and the way they are used for RPF information selection. Multicast routing using PIM is not based on propagation of any type of multicast routes - the process that was used say, in DVMRP. Instead, router performs RPF checks based on the contents of unicast routing table, populated by regular routing protocols. The RPF checks could be classified as either data-plane or control-plane. Data-plane RPF check... Read More
May
26
We are happy to congratulate our student, Ahmet Gokhan Yalcin on obtaining his prestigious CCIE Security certification! It is my personal pleasure to congratulate Ahmet, after meeting him in our CCIE Security Bootcamp in Tampa this year. Here is what Ahmet has to say about his road to CCIE: Read More
May
22
This blog post reviews and compares two most common types of traffic contracts - single rate and dual-rate agreements and their respective implementations using single-rate and dual-rate (two-rate) policing. We are also going to briefly discuss effects of packet remarking on end-to-end throughput and finally look at some examples of IOS configuration. What is Traffic Contract Service-providers network topology typically follows core/aggregation model, where network core has meshed topology and... Read More
May
18
The whole INE team is happy to congratulate Rock Bassole, CCIE #28657! It was my personal pleasure to meet Rock in our CCIE R&S Bootcamps, and I'm glad to see him getting the so well-deserved CCIE title! Keep up the good work, Rock! Read More
Mar
21
The CCDE bootcamp is coming shortly on May 1st, and we would like to provide some information to those of you who have already registered for the class or considering to join us. The class will go for five days and finish right before the CCDE practical exam in Chicago. The class is interactive for the most part - instructor will present you documents, diagrams, slides and questions on board and then the whole class will go through the solutions in live mode, discussing various options and... Read More
Jan
01
This document is presented as a series of Questions and Answers, discussing various aspects of OSPF protocol designed to prevent inter-area routing loops and related issues. The discussion covers ABR functions, Virtual-Links, OSPF Super-backbone, OSPF Sham-Links, BGP Cost Community. Reader is assumed to know these concepts already, as this publication focuses on complex interaction features arising in MPLS/BGP VPN scenarios. The discussion is culminated by analyzing a number of issues arising... Read More
Dec
28
INE is happy to announce a new class dedicated to the recently introduced Cisco Certified Design Expert (CCDE) certification. The first CCDE Practical Bootcamp is to be run on May 1-5th in Chicago, right before the actual CCDE practical exam that is scheduled on May 6th. Our goal was designing a "last-week" refresher and booster class to finalize your CCDE exam preparation. Students are assumed to have solid theoretical knowledge of the exam's technology base prior to attending. This blog posts... Read More
Dec
08
This is a short publication to help you get started with Graded Labs Racks Rentals for CCIE Routing and Switching. We often see people having repeating issues when renting the rack time, so this is guide on how to avoid them. This document is a companion to the following class-on-demand videos: Using the GradedLabs.com Rack Scheduling System and Access the Racks. It is recommended that you both read this publication and watch these short videos to fully benefit from Graded Labs rack rentals. Read More
Nov
26
Problem Statement A popular task in CCIE-level scenarios requires creating an access-list matching a set of prefixes using the minimum number of access-list entries. Typically, such scenarios were relatively easy, so figuring out a combination of subnet prefix and wildcard mask was more or less intuitive. However, a good question would be if there exist a generic algorithm for constructing such "minimal" access-lists. To give you a better feel of the problem, let's start with an example. Look... Read More
Nov
22
Introduction BGP (see [0]) is the de-facto protocol used for Inter-AS connectivity nowadays. Even though it is commonly accepted that BGP protocol design is far from being ideal and there have been attempts to develop a better replacement for BGP, none of them has been successful. To further add to BGP's widespread adoption, MP-BGP extension allows BGP transporting almost any kind of control-plane information, e.g. to providing auto-discovery functions or control-plane interworking for MPLS/BGP... Read More

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