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Good overview, but your description of SDN might leave those readers wondering what is the gist of the matter.

After all, NMS have been in place for decades to "make the administration process simpler and more deterministic" by "removing the proprietary administration interface ... in the routers and performing these tasks in a single software on a centralized network configuration platform".

The important thing is that with SDN one is not focused on faults, performance or audit logs. Rather, one should ultimately be able to change the routing and networking logic atop a commodity IP packet transmission box with network interfaces in the same way that one can change the OS atop a commodity computer with CPU and storage peripherals. At least this is how I understand the issue.



great comparison, thanks for adding that!


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