SDN need can be explained with the help of real life analogy corresponding to water supply system. Water reservoir has pipes (data cables) attached to it to carry water (data) to the destination. Water regulation is done with the help of numerous valves (routers and switches).
Plumber (network admin) is the in charge of addition, up gradation of pipes and valves. As the pipe changes, corresponding valves need to be changed. This is costly and time consuming process, which causes lot of overhead in case of frequent infrastructural updates as the valves need individual-manual intervention. Bulk updation may cause installation errors or are more likely to faulty installations.
Considering the above scenario it is desirable to have remotely controlled updation (increased width, new connections, extensions etc) regarding the pipe (data cables) & valves (switches and routers). So if this analogy is applied to real networking scenario, the SDN concept comes in picture. SDN provides programmable switches & routers which can be controlled remotely and will not require any manual intervention.
INDEX
1. NEED OF SDN
2. HISTORY/BACKGROUND
3. DEFINITION OF SDN
4. TERMINOLOGIES OF SDN
5. SCENARIO BEFORE SDN
6. SDN GROWTH
7. HOW SDN WORKS
8. SDN OPERATION
9. SDN DEVICES
10. SDN CONTROLLERS
11. Introduction to OpenFlow
12. BUILDING BLOCKS OF OpenFlow
13. OpenFlow Messages
14. Virtualization
15. Platform uniformity improves operational efficiency
16. SDN Abstractions
17. Mininet and POX Installation
18. Bibliography
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