Software defined networks

1. SOFTWARE DEFINED NETWORKS
Presented by:Aamir Maqsood
Roll no. : 2202cukmr01
Couse Title/Code:Next Generation Networks / MTCS 201
Student of M.Tech. CSE 2nd semester,
Department of IT,
Central University Of Kashmir.

2. CONTENTS:
•Traditional Networking
•Limitations of Traditional Networking
•Software Defined Networking
•How Does SDN works
•SDN Network Architecture
•References

3. Traditional Networking:
Traditional network refers to the old conventional way of networking which
uses fixed and dedicated hardware devices such as routers and switches to
control network traffic.

4. Limitations of Existing Networks:
Limited scalability: Traditional networks have limited
scalability due to the dependence on physical hardware
devices.
Limited automation: Traditional networks have limited
automation capabilities and require significant manual
intervention
Rigid architecture: Traditional networks have a rigid,
hierarchical architecture that is difficult to modify or
adapt to changing business needs.
Flexibility

5. SDN Networking:
SDN is a Network framework which involves in
separating a Network’s control functions from its data
forwarding functions ,centralizing its intelligence,and
abstracting its underlying architecture from applications
and services.
Control and Data Plane
Control plane:
• The module which takes all decisions, basically an
instructor.
•The routing algorithm.
Data plane:
• The module which carries out the tasks given by the
control plane
• Forwarding of Packets

6. HOW DOES SDN WORKS
Compared to traditional networks, a software defined network has two
types of devices
Controller
•Brains" of the network
•All policies, routing logic are placed in the controller
•"Teaches" the switches what to do with an unknown packet.
 Switches
•The switches in SDN are blind.
• No built-in features.
• Need to be instructed by the controller.

7. CONTD…

8. SDN Architecture

9. References:
• https://www.vmware.com/in/topics/glossary/content/software-
defined-
networking.html#:~:text=Software%2DDefined%20Networkin
g%20(SDN),direct%20traffic%20on%20a%20network.
•https://www.cisco.com/c/en/us/solutions/software-defined-
networking/overview.html
•https://www.ibm.com/topics/sdn