SDN Architechture

[gurmeetsingh121]

SDN Architechture

Hi Everyone

i have gone through the SDN Architecture doument

https://en.wikipedia.org/wiki/Software-defined_networking

-  SDN Application
-  SDN Controller
-  SDN Datapath
-  SDN Control to Data-Plane Interface (CDPI)
-  SDN Northbound Interfaces (NBI)

I am still not have good clarity on the above terms with some example ref so i can understand in more depth.

Thanks in advance!!

[plditallo]

Very simply, SDN architecture is about eliminating the traditional hierarchical tiers of ethernet-based switches that worked well in old-style corporate environments of the 80's/90's with client-server computing as the predominant model.  All the bullet points you have listed contribute in the context of their roles, to delivering dynamic computing and storage for today's computing demands. Let's take the last one on the list as an example--NBI. While the SBI (Southbound) APIs allow for physical/virtual switches to exchange control info, the NBI elevates the control info of the network to a broader level of abstraction, such as the ability to accommodate applications that may create orchestrations across (cloud) resources. An example of a non-proprietary NBI framework with that ability would be OpenStack Neutron/Havana. Jim Metzler's SDN Vision series is a good place to start in order to gain a full understanding of the SDN paradigm. Here's a good overview: https://www.sdxcentral.com/articles/featured/sdnjourney-sdn-vision-hp-metzler/2013/09/?c_action=related_articles