Orhan Ergun
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Orhan Ergun
LAG vs. ECMP discussion on real network deployments
We discussed LAG (Link Aggregation Group) and the ECMP (Equal Cost Multipath) on real network deployments with the Service Provider/Telco Engineer engineers on my slack group. I thought it was good discussion so you can see what others are doing and the reasons of their deployments. In this talk, three people involved. Myself […]
The post LAG vs. ECMP discussion on real network deployments appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What does P router mean in MPLS ?
What does P router mean in MPLS ? It is used in MPLS VPN networks mostly but can be used with any MPLS application, use case. This is very important node in MPLS, and crucial to understand MPLS. MPLS is one of the most commonly used encapsulation mechanism in Service Provider networks […]
The post What does P router mean in MPLS ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
4 Main Design Principles of Mobile Networks
4 Main, Key Design Principles of Mobile Networks – I will explain the 4 key design principles of cellular networks in plain English. In fact I should have said, cell based systems as mobile networks may not be design based on cell based architecture. Let me explain what would be the other deployment […]
The post 4 Main Design Principles of Mobile Networks appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Discussion with Maldivian Operator Dhiraagu (AS7642)
I discussed the BGP Router Reflector design, Settlement Free Peering , Transit Operator choice, Internet Gateways and the Route Reflector connections, MPLS deployment option at the Internet Edge and many other things with the Operator from Maldives. Operator name is Dhiraagu. Autonomous System Number is 7642. Engineer from the ISP Core team, who is […]
The post Discussion with Maldivian Operator Dhiraagu (AS7642) appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is happiness ? Let me show you !
My little , sweet baby girl has just born. This is happiness and I feel totally different now. I am a father of two now ? She says hello to all networking community and father’s friends ?
The post What is happiness ? Let me show you ! appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Wireless ISPs Spectrum Problem
Wireless ISPs also known as WISP mostly use unlicensed frequency spectrum. Frequency spectrum is the most critical asset for the Mobile and Wireless networks and it is sold in auctions for 100s of millions of dollars. Frequency spectrum is managed by the governments and governments in general, sell frequency spectrum in auctions. And […]
The post Wireless ISPs Spectrum Problem appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Istanbul/Turkey Onsite CCDE Training – 50% OFF until Sep-15, 2017
Istanbul/Turkey Onsite CCDE Training will be held between October 30 – November 4. Course will be in English as usual, everyday will be between 9am – 6pm, 9 hours. I am going to extend my CCDE Materials for this course as there was new scenarios and the technologies after August 29, 2017 CCDE […]
The post Istanbul/Turkey Onsite CCDE Training – 50% OFF until Sep-15, 2017 appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What are the changes in August 2017 CCDE Practical exam ?
What are the changes in 2017 CCDE Practical/Lab exam ? As you might know, CCDE Practical/Lab exam was cancelled on May 2017 due to some leakage. Some people tried to sell the scenarios, Cisco cancelled the exam and revoke the certifications of those who involved with that cheating. Some people among them can be […]
The post What are the changes in August 2017 CCDE Practical exam ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
IS-IS Overload Bit – Why IS-IS Overload bit is used ? What are the use cases ?
IS-IS Overload Bit – Why IS-IS Overload bit is used ? What are the use cases ? In this post, I will explain the Overload bit which is an important feature of IS-IS routing protocol. When a router which runs an IS-IS routing protocol have resource issue (CPU, Memory), device shouldn’t receive network traffic. […]
The post IS-IS Overload Bit – Why IS-IS Overload bit is used ? What are the use cases ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is Attachment Circuit in MPLS VPN ?
What is attachment circuit in MPLS VPN ? Definitions are important in networking, if there are alternative usages of the definition, better to know them all for effective communication. MPLS Layer 2 VPN Topology In the above topology, I share, MPLS Layer 2 VPN Topology. There are many terminology but let’s focus on […]
The post What is Attachment Circuit in MPLS VPN ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
BGP Route Reflector in Plain English
BGP Route Reflector in Plain English, in this post, I will explain you the BGP Route Reflector basics, after you read this post, you will be able to answer many questions regarding BGP Route Reflectors. Outline of this post is as below. What is BGP Route Reflector ? Why BGP Route Reflector […]
The post BGP Route Reflector in Plain English appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is Colocation, POP , Carrier Hotels and Meetme Room ?
What is Colocation, POP , Carrier Hotels and Meetme Room ? If you are working in operator domain or a network engineer who wants to learn what is colocation , what is POP (Point of Presence) , how POPs are physically connected , POP terminology , understand meetme room and carrier hotel, this post […]
The post What is Colocation, POP , Carrier Hotels and Meetme Room ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Unique RD per PE per VRF in MPLS
Unique RD per PE per VRF is a deployment option in MPLS Layer 3 VPN. In this post I will explain the different RD (Route Distinguisher) assignment options and at the end of the post, you will understand why you should assign unique RD per PE per VRF. Why RD (Route Distinguisher) is […]
The post Unique RD per PE per VRF in MPLS appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Last 5 days for the August 2017 CCDE Practical/Lab exam
Last 5 days anymore for the August 2017, CCDE Practical/Lab exam. As you might know, you can attend only 4 times per year for the CCDE Practical exam. And not in every country ! There are many places around the world, called Professional Person Vue (PPC) exam centers, and as I said, a lot […]
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Hiding the information from network core
Hiding the information from network core is important. But why hiding the information is important ? What type of information we are trying to hide ? Why from network core only ? How we can hide the information from network core ? Let’s start, why information hiding is important. One of the […]
The post Hiding the information from network core appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is PLR – Point of Local Repair in MPLS Traffic Engineering ?
What is PLR, Point of Local Repair in MPLS Traffic Engineering ? PLR is the term is used in the context of Fast Reroute. I briefly mentioned from PLR in the MPLS Traffic Engineering Fast Reroute Link Protection post earlier and in this post, will explain it in more detail. Let’s look at the below […]
The post What is PLR – Point of Local Repair in MPLS Traffic Engineering ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
IPv6 Business Drivers and PI/PA Address Space
IPv6 Business drivers can be many and different businesses have different reasons to deploy IPv6 on their network. IPv6 is more commonly deployed in the Service Providers than Enterprises or Small Medium Businesses. Do you know why ? Main reason is IPv4 address space exhaustion. There is no available public IPv4 addresses in […]
The post IPv6 Business Drivers and PI/PA Address Space appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Network Interconnection videos have been added into Self Paced SP Training
Recently, I published Self Paced Service Provider Training Course. I didn’t make an Internet wide announcement yet as I still upload the content to the course. Though I haven’t announced it yet, some people have already purchased it and the previous Instructor Led Service Provider course attendees got the access to the self paced […]
The post Network Interconnection videos have been added into Self Paced SP Training appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Network Interconnections Video by Orhan Ergun
Network Interconnections is one of the most important topics for the operator network as it directly related with the cost of the sending traffic out from their networks. I published a network interconnection video on my Facebook page. I explain the peering types, settlement free peering , paid peering , remote peering , IP […]
The post Network Interconnections Video by Orhan Ergun appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
BGP Route Reflector routing loop problem !
BGP Route reflector routing loop arise in IP networks. In this post, I will illustrate the topology which will loop the IP packets between the routers and I will describe multiple possible solution and share a best practice to design BGP Route Reflector in an IP network. BGP Route Reflector Routing loop […]
The post BGP Route Reflector routing loop problem ! appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.