Our Topic is SDN , It stands for Software defined networking Highly correlated with NFV , SDN is big thing in IT and telecom Industry I am going to build your concepts on SDN technology using very a simple graphics and the concepts The concepts which i am going to tell you are of use for everyone which is working in IT or telecom or Networks While NFV is all about building virtual platforms , SDN is making IP networks much more programmable so that packet routing is possible with lots of flexibility and agility . As shown here , SDN is based on concept of separating Brain and control plane for traffic routing , This separation of Brain and control plane makes SDN a very very powerful tool for customizing networks on the fly With SDN , You can provision new bandwidth and define traffic failovers just like never before Now , Let’s start our journey with SDN There is lot of confusion between NFV and SDN , Don’t worry , we are going to clarify both the technologies in very very simplified way using the real life examples Till now , We have seen , how NFV works in the previous videos How NFV helps us building the agile and flexible networks using the flexible Compute , the flexible resources like storage , the blades , the hardware . Since NFV is all about Three main Concepts : The Softwarization , The Virtualization & Orchestration and automation . SDN is a different animal , Its is all about networking control functions for routing & policy definition & This entire thing is done in very very automated way . & With SDN , what we are going to do We are going to ensure the IP & Network reachability is going to happen well in Time . Both SDN & NFV architectures are going to use network abstraction, But they do is totally in different way SDN provides a new level of programmability
and abstraction to Network layer which is play a phenomenal role in Automating the networks . Let’s take deep dive on SDN & let’s understand how its work Just see the Building blocks which represents
the NFV & host multiple Applications . Just like you can remove , replace or keep new
tenant in Build , Similarly you can host applications in NFV as well You can see traffic on road representing SDN
whose main responsibility is to carry traffic to right destination in very very Automated way First thing First , Let’s understand why
we need SDN & How it is helping .. Well , We have also seen this particular example in previous video wherein We have seen the NFV helps in Virtualizing networks which help us in rapid deployment & ultimately reduce our deployment time of New Service / New Nodes Now NFV does it in few seconds .. but what about network reachability The network connectivity and reachability is real problem , For any new node or new service , We need multiple things such as the IP Allocation , the Bandwidth Allocation , the Policy Opening , the Routing changes Actually , We need to do End to End Reachability and for doing that it takes lot of time .. it takes lot of time to prepare design , to execute the changes and we need to do in every router , every switch that is also prone to mistakes , Net Net , for doing the network reachability piece , we take few days & few weeks Ultimately , even if the NFV resource are available but we can’t launch the new service or we can’t make the new node live because our network reachability is not done The SDN is going to help us specifically out here , Let’s understand how SDN works This is our traditional network where traffic
is moving between various Switches & Router in order to reach the final destination SDN changes how networking is fundamentally done. Instead of having a network intelligence which is distributed in every device ( i mean to say every router and switch applying its own brain ) SDN aims to centralize the Brain .. SDN aims to centralize command and control into a central node And Its going to distribute the entire thing in different control plane and in a different data forwarding plane Let’s understand , how this different plane works out there The 1st one is the Data Plane , We also call it as Forwarding function or Forwarding plane In traditional network , In traditional router and switches , There are multiple nodes which are connected to each other All these multiple router and switches , they are connected to each other via line card and the links running between these line cards This is where the data is actually moved from one
device to another , As visible on screen traffic is going all the way from Router A to Router
B to Router C to Router D .. Traffic is moving all the way from Left to the right That’s how the packets are flowing here , We call it as Data or Forwarding Plane The next one is control plane . Well in traditional network , The role of control plane is to take routing decisions . Every router is having its own brain .. You can see brain in this orange color which is like rotating out there Every router apply its own brain to decide the best path to route the traffic These routing decisions are
taken on basis of the routes configured in the router and routes learned from the adjacent nodes or adjacent routers For an example , In traditional network , Router A decides to route the traffic to router B on basis of Brain applied by itself i.e. Router
A I mean to say the router A is taking the decision where to route the traffic Since Router A doesn’t know what’s happening in life of subsequent routers such as C or D , This can be point of concern I mean to say , if there is some problem with Router D , Router A never comes to know , because Router A is not speaking to Router D directly Its going via B , C and then ultimately reaching router D . And if there is problem with D , A will never come to know And A will keep on bombarding the traffic in the same direction & it will never route traffic to a better path There has to be someone , There has to be absolutely someone .. who is keeping end to end eye on complete network and take holistic decision That’s the power of SDN where we are going to bring these resiliencies into the Network The last one is the Management Plane . Now , In traditional network , This is used for performing Operation & maintenance of
network . I mean to say you can do the configuration , You can get the reports You are actually running the network out there , For an example ,We use management plane to fetch reports , Perform Configurations , Get Alerts and Alarms . You can see this guy who is logging into every router and doing the configuration out there on screen If you have to Open new route , Eventually
we need to login into every router and this is very very tedious task which takes lot of time & this is always prone to errors Now we have covered all the 3 planes out there , The data or forwarding plane , The control plane and management plane Now , Let’s see how SDN simplified the life and what good things SDN is going to bring to this particular network This is SDN Powered network where in the controller or brain of network is separated from data or forwarding plane . SDN will change dramatically the way we designing the networks the way we are managing the networks & the way we are running our networks Before we discuss this further , Let’s understand What is SDN ? SDN stands for the Software-Defined Networking (SDN) .. This is an emerging architecture of Network that is fully fully programmable , a much more dynamic network , it is manageable it is cost-effective, it is adaptable, It makes it ideal for meeting the dynamic & random requirements There are 4 key principles of the SDN Networks , The 1st key principle is It Makes the Networking & IP Routing flexible . SDN ultimately enable packets or traffic to reach its destination , It does same with
help of software & dynamic algorithms with full flexibility & Agility Instead of wasting many days in performing manual routing for enabling reachability , SDN does this in better way , ultimately it saves lot of time The 2nd key principle is Decoupling control & Data plane In traditional network , Where Both Brain
& Data forwarding layer sits on same router Here we can see centralized controller whereas Data forwarding plane still resides on Router Here , centralized Controller decides traffic
Routing , Data Plane only used for forwarding Payload to destination
We call this as De-Coupling of control & Data plane
 Offloads brain to centralized controller & Central View of Resources
SDN provide a central view for more efficient resource allocation and running of network
services This facilitates centralized monitoring of
entire network The control plane is taking decision considering
end to end topology . While routing traffic from Router-A , It does consider what’s
happening in life of Router-D . In case there is some outage or link congestion or degradation
happened with Router-D , All the routers are told to route traffic via Router-X
 Programmable Network , Centrally Managed , Agile
for any Need Centralized control plane means network control
to become directly programmable and the underlying infrastructure to be abstracted for applications
and network services SDN makes networks programmable so that operators
can support multiple applications such as dynamic provisioning of bandwidth , Auto Scale
out , Scale In , Building protection paths etc ..
There are upper layer applications which can flexibly manage the controller such as exposing
Controller directly to user on Web portal where End user can provision or De-Provision
bandwidth himself The true power of SDN is Abstraction, The
whole logic flow is so automated that network applications can make requests SDN controller
which in turn will adjust the network resources, changing configuration . All of this happens
within few Seconds In SDN Architecture ,
OpenFlow protocol is key to entire topology . The group of few Intellects started working
on OpenFlow specification in Stanford University & thereafter , In year 2011 , The Open Networking
Foundation also called as ONF was founded to promote SDN and OpenFlow . There are several
workgroups created which started standardizing this OpenFlow protocol Most of OEMs & Vendor are supporting this
OpenFlow protocol now . Here SDN Controller can belong from One OEM where Data / Forwarding
plane may belong to another vendor . SDN Controller can also
communicate with many types of network elements from different vendors with help of OpenFlow
Protocol . This OpenFlow protocol provides unified method or southbound interface for the control plane
to communicate with the data plane . This is followed by all vendors such as Cisco , Juniper
, HP etc.. OpenFlow works on standard API defined between the control and the Data or
forwarding plane . With help of OpenFlow the Brain or Controller can manipulate or change
the routing tables , routing Algorithm used by forwarding plane . This allows remote configuration
of packet forwarding tables by adding, modifying and removing packet matching rules and actions.
This OpenFlow needs to be supported by both Controller and Forwarding routers used in
network . The existing devices can be also evolved to support OpenFlow , For example
, All Existing Traditional Switches Routers
etc .. can become Data Forwarding plane can receive instructions from 3rd Party Controller
. Here we can transform our existing network
to support SDN Since controller is exposed to Business applications with help of APIs , This gives us opportunity
to innovate multiple features & functionalities in the network as per customer requirements Now , We will comeback to our 1st Slide where
Network reachability was big problem . Now , With SDN coming into picture , We can get
network reachability done within few second . This solves our major problem Let’s Quickly Re-Cap key benefits & Features
of SDN based networks :- Directly Programmable
Flexible , Dynamic & Agile Centrally Managed
Abstracts Network De-Couples Control & Forwarding plane
Based on Open Standards & Vendor Neutral We have already discussed these in previous
Slides With this , I want to leave a strong Visual
message so that you never forget the difference between NFV & SDN Just see the Building blocks which represents
the NFV & host multiple Applications . Just like you can remove , replace or keep new
tenant in Build , Similarly you can host applications in NFV as well You can see traffic on road representing SDN
whose main responsibility is to carry traffic to right destination in Automated way Hope this clarifies the concept Well That’s me again .. , Now we have covered
both NFV & SDN for Telco Operators . In Next Video , I am going to demystify Hypervisor
Vs Container mystery which are foundation stones for Modern , Stay tuned . If you want to download this PPT or Video
, Please visit my Website : http://telecomtutorial.info/ Hope this Video presentation is useful for
you . Please feel free to Like, Dislike , Comment & Share . Pls subscribe to my Youtube
channel for more Technical Videos


Ram Kumar Lohkana · December 3, 2018 at 9:14 pm

Thanks Sir,

王洋 · December 4, 2018 at 7:26 pm

Great and clear explanation for SDN~ I got the initial image on that and try to go deep, Thx for video👍👍

Rishi M · December 6, 2018 at 12:56 pm

Kudos to you. Waiting for next Video

Nathan Fischer · December 11, 2018 at 2:46 am

This is great! Thank you

Ankur Sharma · December 31, 2018 at 2:55 am

Great presentation!

Changwei Hsu · January 19, 2019 at 2:09 am

I've been watching videos of SDN for a while and this is obviously the best one. Very good structure and easy to understand. Thanks and thumbs up!

Arjun Raghav · January 23, 2019 at 5:52 pm

Will decoupling control plane and moving it to centralized location cause a bottle neck or how feasible if network grows large?

Tim Eggenberger · January 27, 2019 at 7:56 pm

Great video! What application did you use to do your slides?

Arun Arora · February 22, 2019 at 6:32 am

Excellent presentation, slides and explanation.. Kudos 🙂

manikanta pedapati · February 24, 2019 at 9:27 am

Nice vikas, easy to understand VNF and SDN .. 👌👌👌 .. But I am looking to learn more about SDN suggest me.. Were I can find best information ..

Thanks in advance..

Renjith M P · March 5, 2019 at 2:25 pm

supper 🙂 , most of the "What is SD-WAN" is marketing related video from vendors. your simplified and detailed explanation is awesome.

pulkit garg · April 20, 2019 at 10:08 am

What is song name which is used in start of video?

Nilton Braz · April 28, 2019 at 4:58 pm

Excelent explanation! You have a subtitle of the your video? Obrigado.

Thaeko ko Maung · May 6, 2019 at 10:27 am

Very good presentation , thank you for your knowledge sharing

deepak sharma · May 10, 2019 at 12:41 pm

Great Video Thanks for sharing, can you explain the OpenFlow as well ?

kingshuk dey · May 17, 2019 at 1:09 am

Sir, Its wonderful tutorials, Your explanation so interactive. I cant found any Telecom Cloud tutorial on internet like that, Great Sir.. Please posted ………

Manoj P · June 7, 2019 at 11:48 am

Well articulated. Many thanks.

Анна Савченко · June 15, 2019 at 11:14 am

You are so talented in explaining! Thanks a lot for all the videos!

Анна Савченко · June 15, 2019 at 11:15 am

Could you please explain the role of OpenStack in NFV?

温和文 · June 21, 2019 at 7:55 am

India spoken

Bhavna Sharma · July 15, 2019 at 9:33 am

Great explanation. Thanks!

Vidhur Anand · July 16, 2019 at 8:22 am


Peter G · July 16, 2019 at 1:09 pm

Hello, thanks for this alike… but for everybody, this SDN/NFV is still of hype today and the real benefits much from reality yet.. So to make this happen what you see, we need to study 10x much than what we've used to so far. But one day it may work like they imagined it 10 years ago already now… And it's just hell of complicated! So you be eventually in charge of decision to transition, think it 10x over that you have the business case for it.

thakur rawat · July 25, 2019 at 7:28 am

Very nice way u have explained👌

Manas Sahoo · August 26, 2019 at 1:05 pm

very well explained in a simple way

Rahna Cm · September 18, 2019 at 12:45 pm

Very good presentation. Please make a video about policy based security architecture for Sdn.

vishal s · September 21, 2019 at 8:19 pm

Simply Excellent

Micheal Maher · October 2, 2019 at 12:43 pm

Thanks for the nice explanation really it makes the difference between them very clear for me .

Polkampally Tirumal · October 3, 2019 at 3:29 am

thanks Vikas for explained in detailed. Its really the best video till now i have ever seen, thanks once again for creating such a session

morteza samadian · October 13, 2019 at 5:55 am

would you please turn on Close Caption. Thank you

Fatema Akter · November 1, 2019 at 3:13 am

Thank you. Great explanation.

M ali · November 2, 2019 at 7:04 pm

very very thanks, it's powerful knowledge

Hamidullah Muslih · November 5, 2019 at 9:11 pm

I like your analogy, wonderful

Aditya Raut · November 11, 2019 at 4:03 pm

God bless you…! People like you make this world a better place

Jayadev Neravanagi · November 28, 2019 at 6:05 am

Great explanation and presentation, This video is really helpful to understand SDN.

Ashwani Kumar · December 18, 2019 at 1:43 pm

Nice explanation . Thank you ..

Mukesh Bhagat · December 28, 2019 at 2:33 am

Very helpful video thanks sir

sanjeet bajwa · January 6, 2020 at 11:48 am

very clearly explained. Since am not from telecom domain but still got a hang of things. Great job!

Mohamed Hasan Adnan · January 15, 2020 at 7:50 am

Simply superb n u banged on the points.. thanks.

Harun Umar · January 16, 2020 at 12:56 pm

Thanks for this

Vinayak Bhat · February 15, 2020 at 6:11 am

Stupid explanation. This guy doesn't have any knowledge on real networks. Time waste

Jile Singh · February 18, 2020 at 12:42 pm

great explanation

Chu Hà Khanh · March 13, 2020 at 8:26 am

Very nice videos which save me alot of times. I hope can watch more from you!

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