Orhan Ergun 2 Comments

Microwave or Fiber which one is faster ?

Microwave or Fiber which one is faster ? I will explain  the faster connectivity option and some of the use cases for each, deployment considerations a bit in this post. Why latency is important for some special businesses  ? Have you heard about HFT (High Frequency Trading) ? If you like the discussion points, after reading the post, share your comment, let me know it so I can write more on this subject.

 

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Orhan Ergun No Comments

What is IRU ? Indefeasible Right of Use ?

What is IRU (a.k.a Indefeasible Right of Use)  ?  If you are working in the Operator, Service Provider or Telco/Carrier networks, you probably heard this term. If you haven’t, you need to learn it. Read more

Orhan Ergun 4 Comments

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.

 

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Orhan Ergun 1 Comment

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. Read more

alaaissa No Comments

IS-IS Case Study – Ausnet

This is a case study which provides a detailed design steps for IGP protocol on hypothetical Internet Service Provider, called Ausnet.

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Orhan Ergun No Comments

Flat OSPF network is not a problem ! But

Flat OSPF network, or single area OSPF networks are real. In fact most of the OSPF network today deployed, is flat OSPF networks. But how many routers can be placed safely in an OSPF area ? Any number from the real world OSPF deployment ? I will share in this post.

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Orhan Ergun 4 Comments

Submarine Cable Basics

Submarine Cable is probably the most important topic for the International traffic. More than 99% of the International traffic , including data, voice and video is carried over Submarine Cables.

 

But still submarine cables is not very well known topic among the network engineers, especially if you are not working in the Service Provider, Carrier or Telco.  Read more

Orhan Ergun 1 Comment

What is Urban and Rural area in networking ?

What is urban and rural area ? What is underserved area in networking ?

 

These definitions are heavily used in networking. And all broadband network designers take always these definitions into an account while they do their design. I think knowing these definitions as a network engineer is valuable for you.  Read more

Orhan Ergun 2 Comments

Some recommendations for the network engineers

In this post, I will share many network engineering blogs which will be very beneficial for the network engineering and for those who want to learn more about network design.

 

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Orhan Ergun 1 Comment

Tier 1, Tier 2 and Tier 3 Service Providers

Tier 1,Tier 2 and Tier 3 Service Providers

What is tier in the first place ? If you are dealing with Service Provider networks, you hear this term a lot. But how we define Tier 1,Tier 2 and Tier 3 Service Providers ?

 

What should be their infrastructure to be seen as Tier 1 for example ?

 

Which tier is bigger in scale ? Which one is better for the customers to purchase a service from ?

 

Why Service Providers claim that they are Tier 1 or Tier 2 ?

 

Note: If you are looking for a much more detailed resource on this topic, please click here.

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Orhan Ergun 3 Comments

Is Fate Sharing bad thing in network design ?

Is fate sharing bad thing in network design? Someone asked this question recently on my youtube channel and I want to share a post for the website followers as well.

First of all, what is fate sharing ? Below is the Wikipedia definition of fate sharing.

” Fate-sharing is an engineering design philosophy where related parts of a system are yoked together, so that they either fail together or not at all ” Read more

Orhan Ergun No Comments

Introduction to VPN (Virtual Private Network)

Introduction to VPN (Virtual Private Network)

Let’s start with the definition. VPN is a logical network and created over shared physical infrastructure.

Shared infrastructure can be private such as MPLS VPN of a Service Provider or over the Public infrastructure such as Internet.

There are many concepts to understand VPN in detail but in this article I will cover the definition, common design considerations, and some not well known concepts about it.

We can group VPNs into two categories. WAN and the Datacenter VPN Technologies.

WAN VPN Technologies

1.GRE

2.mGRE (Multipoint GRE)

3. IPSEC

4. DMVPN

5.GETVPN

6.L2TPV3

7.LISP

8. MPLS L3 VPN Read more

Orhan Ergun No Comments

Design considerations for network mergers and acquisitions

Network mergers and acquisitions are the processes which can be seen in any type of businesses. As a network designers, our job to identify the business requirements of both existing networks and the merged network and finding best possible technical solutions for the business.

There are many different areas which need to be analyzed carefully. Wrong business requirement gathering and design analyze, definitely lead to catastrophic failures.

Business and network analysis and technical information gathering are the key steps and there are many questions which need to be asked and answered should be well understood.

Network mergers and acquisitions is also called as Network integration.

Below are the key points for any type of network mergers and acquisitions projects.

  • Business analysis and information gathering

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Orhan Ergun No Comments

OSPF Multi-Area Adjacency | OSPF Area Placement | RFC 5185

OSPFv2 by default setup only one adjacency over a single link. But this can be an issue some time and as a network designer you should understand the consequences and know the available solutions.

Placing a link in wrong OSPF area can create an OSPF sub optimal routing especially in hub and spoke topology.

In IS-IS or OSPFv3, this wouldn’t be an issue because IS-IS and OSPFv3 allow link to be placed in more than area or level. (In IS-IS, area is assigned to the router, not to the link. Thus I use level keyword)

Let’s look at the below network to understand what is the issue and how OSPF multi-area adjacency can solve the sub optimal routing problem. Read more

Orhan Ergun 1 Comment

IS-IS Design considerations on MPLS backbone

IS-IS Design considerations on MPLS backbone

Using IS-IS with MPLS require some important design considerations. IS-IS as a scalable link state routing protocol has been used in the Service Provider networks for decades.

In fact, eight of the largest nine Service Providers use IS-IS routing protocol on their network as of today. Read more