What is OAM – Operation, Administration, Maintenance ?
OAM is a set of tools that have been used to provide network fault indication, performance information, fault localization, data and diagnosis functions. In different standard bodies usage of OAM is slightly different thus it creates a confusion among the engineers. IETF published a best practice RFC to clarify the OAM acronym. RFC 6291 ” Guidelines… Read More »
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Orhan Ergun July 2015 CCDE Training
I am glad to announce that my next Online CCDE Training will start at second week of July. It will be Online through Webex , all the sessions will be recorded and you can download them to watch later as well. Also , when you pay the ccde training cost, you can attend my every… Read More »
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Congratulations to Roy Lexmond on Passing CCDE Practical Exam !
I am very glad to announce that Roy Lexmond from my April CCDE training class passed his CCDE Practical exam yesterday in France. Below is his success story and here is his earlier feedback for the class. I should say that He really likes the design and open to learn new things and very clever.… Read More »
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Why and Where Ring topology is used ?
Ring topology is used mostly for economical reason. It is very common topology in the service provider access, and it is not so uncommon in Aggregation and Core ( Backbone ) networks as well. Long haul links are expensive thus in order to provide last mile connectivity in the Service Provider access domain, nodes might… Read More »
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Push and Pull Based Control Plane Mechanisms
Control plane packets are used to build a communication path between the networking devices. In some cases control plane is used to advertise and learn the endpoints. Imagine a network which consist of these networking devices, in order to crate a graph or tree among them for bridging or routing purpose, control plane protocols are used.… Read More »
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Common Networking Protocols in LAN, WAN and Datacenter
Spanning Tree, Link Aggregation , VLAN and First Hop Redundancy protocols are used in Campus, Service Provider Access and Aggregation and in the Datacenter environment. There are definitely other protocols which are common across the Places in the Networks but in order to keep this article short and meaningful I choose these four. I will… Read More »
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BGP PIC – Prefix Independent Convergence
BGP PIC ( Prefix Independent Convergence ) is a BGP Fast reroute mechanism which can provides sub second convergence even for the 500K internet prefixes by taking help of IGP convergence. BGP PIC uses hierarchical data plane in contrast to flat FIB design which is used by Cisco CEF and many legacy platforms. In a hierarchical… Read More »
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Bridging,Provider Bridging,Provider Backbone and Shortest Path Bridging
I received an interesting comment to my last post on networkcomputing It was about Avaya’s SPB and how it served in the core of the network at the Sochi Olympics. For those who are not familiar with acronym, SPB stands for Shortest Path Bridging and it is used for large scale bridging in the data… Read More »
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50 000 Page views of orhanergun.net between March-May 2015
This blog received 50 000 page views between 1 of March and 1 th of May.I shared you couple more metrics from the site stats in addition to Pageviews. Since at the same time two classes I teach ( Pre-CCDE and CCDE ) in addition to my other jobs, I couldn’t update the blog since… Read More »
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Basic Networking Questions – 3
There are 8 basic networking questions below. Although this post is related with networking basics, you can click here to solve advanced networking tests. If you are interested in more basic networking questions, you should click here How was it ? Leave your comment in the comment box.
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What is the real reason behind IP and MPLS Traffic Engineering ?
MPLS traffic engineering has many use cases and it helps to solve the problems in an MPLS enabled networks. These use cases are in general; QoS guarantee, End to End SLA , Fast reroute, Admission control and so on. All of them at the end is done for the COST SAVING. The real reason behind MPLS Traffic… Read More »
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VPN Design discussion
In this post, I will give you a business requirements and information about the business of a fictitious company,together we will try to find an optimal solution for the given questions. There will be many valid solution as you will see from the comments, we will have to make tradeoffs between each design goals while… Read More »
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April CCDE Training class is going to start tomorrow
I am glad and excited to announce that my April 2015 online CCDE class will start tomorrow ( 07/04/2015) with 10 great guys. As I promised to them I limited to class to 10 , so everybody can ask as much as questions, join the discussions and share their comments. I will share their success… Read More »
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What does really MPLS layer 2 VPN mean ?
Couple days before I received an email from one of my readers related with his design. He designed a network infrastructure for his customer and wanted me to take a look as well. But I realized that He has some misunderstanding on the usage of MPLS layer 2 VPNs and I thought just briefly mentioning… Read More »
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Networking Test – 3
In this networking test you will have 6 questions. MPLS, BGP, Routing convergence, MPLS Traffic Engineering are just some of the concepts in the test. Please provide your username and email for the Leaderboard. If you can be in leaderboard, I will use those information later to give special prizes such as discount in my… Read More »
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VRF-Lite+GRE/dot1q or MPLS L3 VPN
I am going to create a new category on the blog which we will discuss together the different technologies,protocols, designs and architecture. You can suggest a discussion topics and you all please welcome to join the discussions in the comment box of each topic. I want to throw a first topic for the discussions !… Read More »
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Network Complexity
Network complexity plays a very important role during network design. Every network designer tries to find the simplest design. Although there is no standard definition for the network complexity yet, there are many subjective definitions. In today network designs decisions are taken based on an estimation of network complexity rather than absolute, solid answer. If… Read More »
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2016 CCDE Practical Exam Dates
Cisco announced 2016 CCDE Practical exam dates. CCDE practical exam is organised only in every 3 months. Prerequisite for the exam is CCDE Written Qualification exam. You can attend the exam 4 times a year in a Professional Pearson Centers. I am planning to start my CCDE trainings 2 months before an announced exam date… Read More »
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Introduction to Network Design, Pre-CCDE Training
I am going to start an ONLINE Pre-CCDE preparation course in Mid of April I realized that many people is not ready to start study CCDE study and they don’t know what they study before attend a CCDE Training or Bootcamps. Course will cover network design principles,theory of the; IGP, BGP, MPLS, VPNs, Qos, Multicast and… Read More »
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Networking Quiz -2
In this networking quiz you have 5 questions. It is not a basic, also not too hard.It should take less than 10 minutes for an experienced engineers. If you want to learn the basics of NETWORK DESIGN, check my latest PRE-CCDE Training. You can enjoy with more quizzes by clicking here. How was it ?… Read More »
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