O'Reilly logo
  • Sutandra Chatterjee thinks this is interesting:

This increasing preponderance of East-West traffic does not benefit from the overhead and complexities that have evolved in traditional network switches to provide just the de-centralized survivability that Mr. Baran so wisely envisioned for the WANs of the past.

From

Cover of Software Defined Networks, 2nd Edition

Note

main important point that SDN is meant for modern data centers.