Orhan Ergun
Author Archives: Orhan Ergun
- Home → Author's archive:
Orhan Ergun
Fast Reroute, Fast Convergence, WRED and WFQ
Fast Reroute , Fast Convergence , WRED and WFQ. You may think that why Orhan is putting all these mechanisms together. I will give you an analogy. Those who participate my talks., know that I love using analogies. Before we try to understand how these mechanisms are related with each other, let me explain what …
Continue reading "Fast Reroute, Fast Convergence, WRED and WFQ"
The post Fast Reroute, Fast Convergence, WRED and WFQ appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is AIGP – Accumulated IGP Metric Attribute? Where AIGP is used?
What is AIGP – Accumulated IGP Metric Attribute? Where AIGP is used? AIGP stands for Accumulated IGP Metric Attribute which is specified in RFC 7311. IGPs (Interior Gateway Protocols) are designed to run within a single administrative domain and they make path-selection decision based on metric value. This post is written based on the information in BGP …
Continue reading "What is AIGP – Accumulated IGP Metric Attribute? Where AIGP is used?"
The post What is AIGP – Accumulated IGP Metric Attribute? Where AIGP is used? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is OTT – Over the Top mean? OTT Providers
What is OTT – Over the Top and How OTT Providers Work? Over the Top is a term used to refer to Content Providers. So, when you hear Over the Top Providers, they are Content Providers. Content can be any application, any service such as Instant messaging services (Skype, WhatsApp), streaming video services (YouTube, Netflix, …
Continue reading "What is OTT – Over the Top mean? OTT Providers"
The post What is OTT – Over the Top mean? OTT Providers appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is Carrier Hotel?
What is Carrier Hotel? Carrier Hotel is a Company that owns large buildings and rents out redundant power and floor space. And of course, attracts many Telco’s and Carrier networks to the building. Carrier Hotel often leases off large chunks of space to Service Providers or Enterprises. These companies operate the space as a datacenter …
Continue reading "What is Carrier Hotel?"
The post What is Carrier Hotel? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Is Protocol Independent Multicast (PIM) really Protocol Independent?
Is Protocol Independent Multicast (PIM) really Protocol Independent? What is that dependency? Does PIM require an IP or can it work with non-IP? If you don’t know about PIM, please have a look at here and here. One of my students asked, is PIM require an IP (Internet Protocol), which triggered me to share the …
Continue reading "Is Protocol Independent Multicast (PIM) really Protocol Independent?"
The post Is Protocol Independent Multicast (PIM) really Protocol Independent? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
What is Optimal Routing and Suboptimal Routing in Networking
What is Optimal Routing and Suboptimal Routing in Networking? This may be seen very easy for some of you but let’s make a philosophy a little bit, means let’s design around optimal routing. Network engineers know that one of the tradeoff in network design is Optimal Routing. We want our application traffic to follow Optimal …
Continue reading "What is Optimal Routing and Suboptimal Routing in Networking"
The post What is Optimal Routing and Suboptimal Routing in Networking appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Recommended Resources for September 2019 First Week
I would like to share with you every week some networking resources , can be video , article , book , diagram , another website etc. Whatever I believe can be useful for the computer network engineers, mobile network providers, satellite engineers ,transmission experts, datacenter engineers, basically whatever I am interested in and I like, …
Continue reading "Recommended Resources for September 2019 First Week"
The post Recommended Resources for September 2019 First Week appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
BGP Optimal Route Reflection – BGP ORR
BGP Optimal Route Reflection provides Optimal Routing for the Route Reflector Clients without sending all available paths. I recommend you to read this post if you don’t know about BGP Route Reflector. If you are looking to learn BGP starting from Zero to Hero, Click Here. Service Providers mostly prefers Hot Potato Routing in their …
Continue reading "BGP Optimal Route Reflection – BGP ORR"
The post BGP Optimal Route Reflection – BGP ORR appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Will CCDE Practical Exam (Lab) Change in 2020?
Will CCDE Exam (Lab) change in 2020. I have been receiving this question again and again after Cisco’s announcement on Cisco certification exam changes. Short answer is NO. Little bit long answer is, it will not change in February 2020 and in fact it has been the only design certification since many years. (Cisco I …
Continue reading "Will CCDE Practical Exam (Lab) Change in 2020?"
The post Will CCDE Practical Exam (Lab) Change in 2020? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Technologies and the protocols may not be used for what they were intended
I was reading a book today , called Deploying QoS for Cisco IP and NGN networks, which I can recommend you for history and future for QoS in networking industry, there was couple paragraph in the book, which lead me to share my thoughts about the protocols/technologies and their usage. In the book, as …
Continue reading "Technologies and the protocols may not be used for what they were intended"
The post Technologies and the protocols may not be used for what they were intended appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
May CCDE Practical exam results have been announced. Student feedbacks in this post!
Hello, May 2019 CCDE Practical exam results announced few days ago. I am happy to help 4 people to have their CCDE number on May 2019 exam. Congrats to Matt , Fredrik , Dmytro and Schilling for passing CCDE Practical exam. They received their numbers! Let me help you to get it now ! Next …
The post May CCDE Practical exam results have been announced. Student feedbacks in this post! appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Dynamic Network Diagrams, This is what we need!
We all create network diagrams. Network Engineers create network diagrams. But for who ? When ? How they are accurate ? Do we really need network diagrams ? Let me share my thoughts with you. Network engineers have been creating network diagrams, physical diagrams, logical diagrams, showing Vlans , IP addresses , so many …
Continue reading "Dynamic Network Diagrams, This is what we need!"
The post Dynamic Network Diagrams, This is what we need! appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
IPv6 in Enterprise , Should we still talk about it?
5 years ago Jeff Doyle and I recorded a podcast on IPv6 in Enterprise. We talked about IPv6 addressing plan , adaption and growth rate of IPv6 in Enterprise. In this post I would like to talk about IPv6 deployment status, challenges and the possible business drivers in IPv6 and I will share my thoughts on …
Continue reading "IPv6 in Enterprise , Should we still talk about it?"
The post IPv6 in Enterprise , Should we still talk about it? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Tech Field Day in Barcelona
I was in Barcelona last week, there was a Cisco Live as you might know. During the Cisco Live unfortunately I couldn’t meet with people as I was invited them by Tech Field Day and recorded many great sessions together. Cisco announced ACI in Cloud and there was presentations about it. If you don’t …
Continue reading "Tech Field Day in Barcelona"
The post Tech Field Day in Barcelona appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
2018 was a good and busy year ! Things I have done during the last year
2018 is done! I wanted to share what I have done during the last year. During 2018, probably the biggest decision for me was establishing a company in Turkey. This photo was taken during a CCDE Bootcamp 10 days after I opened an office in Istanbul. Before I established an Office, I was …
Continue reading "2018 was a good and busy year ! Things I have done during the last year"
The post 2018 was a good and busy year ! Things I have done during the last year appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
BGP Implicit and Explicit Withdraw
BGP Implicit and Explicit Withdraw are important BGP messages. Understanding these two mechanisms not only help for understanding BGP convergence but also helps for BGP path diversity. While I was explaining BGP Add-Path in my Instructor Led CCDE course, I used the term ‘BGP Implicit Withdraw’ Then someone asked what is ‘ BGP Explicit …
Continue reading "BGP Implicit and Explicit Withdraw"
The post BGP Implicit and Explicit Withdraw appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Will Cisco Viptela continue to be one of the Leaders in SD-WAN ?
In 2017, Cisco completed Viptela acquisition. It is not a surprise for me that Gartner published Cisco as the Leader in WAN Edge Infrastructure in 2018. This is Gartner’s famous Magic Quadrant report. I wrote a post for Silverpeak before. Silverpeak is listed in the Leaders category. Three vendors presented their solutions and I …
Continue reading "Will Cisco Viptela continue to be one of the Leaders in SD-WAN ?"
The post Will Cisco Viptela continue to be one of the Leaders in SD-WAN ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Routers Getting Routered – Silver Peak SD-WAN
Silver Peak SD-WAN. Routers Getting Routered – One of the Silver Peak’s Slogan for SD-WAN. First, let’s have a look at the video below that the Slogan of “Routers Getting Routered” seems marketing, but actually it has a technical meaning behind it. Video : Silver Peak Youtube Channel I attended the last …
Continue reading "Routers Getting Routered – Silver Peak SD-WAN"
The post Routers Getting Routered – Silver Peak SD-WAN appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Hair-pining in a Wide Area Network – Simple Design Scenario
In this post we will discuss how hair-pining is occurring in some topologies in the Enterprise branch sites, when connecting to 2 Service Providers, while the 2 Service Providers are not directly connected to each other and don’t have any MPLS/VPN Inter-AS Option (A,B,C,..) with each other. From the customer side, some of the remote …
Continue reading "Hair-pining in a Wide Area Network – Simple Design Scenario"
The post Hair-pining in a Wide Area Network – Simple Design Scenario appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Network Discovery and Mapping
What is Network Discovery and Mapping? As networks are growing and getting more dynamic, mapping and documenting the devices that are connected to our network will be harder and much time consuming. I know paper work and the network documentation are the two tasks most network engineers, including myself hate, but these are necessary steps, …
Continue reading "Network Discovery and Mapping"
The post Network Discovery and Mapping appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.