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Author Archives: orhanergun

My Son’s birthday.60% discount on the CCDE preparation bundle for the first 20 people !

Today is my son’s birthday. So I decided to give 60% discount on my CCDE preparation resources bundle for the first 20 people which will be first come first serve basis and this offer stands good till end of 23th of October. This is the ultimate resource for those who study Cisco Certified Design Expert certification. Earlier… Read More »

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Network Design Best Practices – Simplicity

Network Design should be simple.Simplicity is the first of the network design best practices which I want you to remember. If you are in the field for enough time, you probably heard the KISS principle. If you are a good follower of my blog , you maybe heard SUCK principle as well. KISS stands for… Read More »

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Cisco CCDE Practical Self Study Materials

CCDE Practical Self Study Materials are available now ! This material is newly created by Orhan Ergun and will help with preparation on your certification journey. The material is applicable for the CCDE Practical but would also be of use for candidates pursuing their CCDE Written and / or CCIE exams. Advanced Technologies Workbook Design… Read More »

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Bad Network Design

Bad Network Design – Availability of  a system is mainly measured with two parameters. Mean time between failure (MTBF) and Mean time to repair (MTTR) MTBF is calculated as average time between failures of a system. MTTR is the average time required to repair a failed component (Link, node, device in networking terms) Operator mistakes […]

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Understanding the real problems for Network Design

Designers should be trained to understand the real problems. An excellent solution to the wrong problem is worse than no solution. As a designer, you shouldn’t start by trying to solve the problem given to you. You shouldn’t try to find a best design for the given problem.You should try to understand the real issues.… Read More »

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Do you really need Quality of Service ?

Quality of service (QoS) is the overall performance of a telephony or computer network, particularly the performance seen by the users of the network. Above is the Quality of Service definition from the Wikipedia. Performance metrics can be bandwidth, delay, jitter, pocket loss and so on. Two Quality Of Service approaches have been defined by… Read More »

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Russ White – Orhan Ergun CCDE Practical Exam Scenario

I am glad to announce that Russ White and I have been preparing a CCDE Practical Exam ( Lab Exam ) Scenario. This is the most realistic scenario available anywhere.Because it is not just prepared by a CCDE but one of the founder of the exam involved. Disclosure : This is not asked in the CCDE… Read More »

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Advanced Carrier Supporting Carrier Design

LDP is the most commonly used label distribution protocol in today MPLS networks. Although it lacks of Traffic Engineering, Admission Control, Fast Reroute capabilities, it scales very well because of its Multi Point to Point Label Switched Path.BGP can also assign a label for the IP and also for the VPN prefixes and in this article I… Read More »

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SDN for the Network Engineers, What should you do ?

Software Defined Networking is real,everyone talks about SDN, network engineers worry about their jobs and ask below questions. Hundreds if not thousands of articles, a lot of books have been written on SDN. SDN is not a new idea or concept and we see this ping pong game many times but this time it is marketed very… Read More »

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MPLS Quiz

There are 20 relatively easy MPLS questions in the below MPLS QUIZ. It should take around 30 to 45 minutes and above 50 is nice score in my opinion. Although this post is related with MPLS, you can click here for the other tests. Please specify your name and email address to receive an email for… Read More »

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CCDE Practical Training Demo Video

I have been delivering CCDE practical training for quite some time. Couple months ago I have started a survey for my CCDE training. 134 people voted and here is the results. From the votes as I understand, many people have been looking for a demo, sample videos from my CCDE practical training class. Below is the half an hour CCDE Practical demo video from my CCDE training.… Read More »

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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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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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