Oct
09
CCIE R&S 5.0 Update For information about our CCIE R&S v5.0 Training Program see the video series CCIE Routing & Switching - Overview and Preparation Introduction Congratulations on purchasing INE's CCIE R&S v4.0 Training Program, the complete solution to passing the CCIE R&S lab exam! This document provides you with the detailed guidelines to using the products comprising the training program. This program structure has been designed under the realistic assumption that you may allocate about 3... 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
17
Abstract This publication illustrates some common techniques for troubleshooting multicast issues in IP networks. Common problems and their causes are discussed, troubleshooting techniques demonstrated. PIM Sparse mode is used for most of the examples, due to the fact that this is the most complicated mode of multicast signaling. The suggested troubleshooting approach separates control plane from data-plane troubleshooting and heavily relies on the mroute command for the control-plane... 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
Jul
22
Note: A complete study plan that utilizes all products in INE training program could be found here: How to Pass the CCIE R&S with INE's 4.0 Training Program The two foundation products for self-paced CCIE R&S studies are the IEWB-RS VOL1 and VOL2 workbooks. Together, these two sum up to 4000 pages of hands-on CCIE lab practice content. CCIE R&S VOL1 has over 600 technology-focused scenarios, while CCIE R&S VOL2 has 20 full-scale mock lab scenarios that now started featuring independent... Read More
Jul
05
Recently, there have been a lot of talks around LISP - location and Identity Separation Protocol. This is a “new” technology aiming to resolve some of the Internet scalability issues and which has been implemented in IOS 15.x. In this blog publication we are going to give a general overview of LISP, pointing out benefits as well as drawbacks of the technology. Hierarchical Routing and its Problems Ever since ARPANet has been launched, routing in packet switched networks (PSNs) has been based on... Read More
Jun
14
In this short blog post, we are going to give condensed overview of the four main flavors of Frame-Relay Traffic Shaping (FRTS). Historically, as IOS evolved with time, different methods have been introduced, having various level of feature support. Two main features, specific to Frame-Relay Traffic-Shaping are per-VC shaping and queueing and adaptive shaping in response to Frame-Rleay congestion notifications (e.g. BECNs). You'll see that not every flavor supports these two features. We begin... 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

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