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A Simplified View of the Higher Dimensional the SDN Continuum

A Simplified View of the Higher Dimensional the SDN Continuum. Management APIs. Management Layer. Apps. Apps. CP/SDN NBI. Control Functions. …. OF/SDN NBI. Classical control plane. Implies that consistency model is passed across the NBI.

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A Simplified View of the Higher Dimensional the SDN Continuum

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  1. A Simplified View of the Higher Dimensional the SDN Continuum Management APIs Management Layer Apps Apps CP/SDN NBI Control Functions … OF/SDN NBI Classical control plane Implies that consistency model is passed across the NBI Control(ler) Layer (one or more purpose (e.g., floodlight) or function specific controller) Hybrid Node CP/SDN -- Indirect control of the Forwarding Plane -- Partial separation of CP and FP -- Select open interfaces to the control plane -- “Partially” centralized control plane -- Inter-node communication -- Examples: PCE, IRS, vendor SDKs OL/SDN -- No control of the underlay CP or FP -- Complete separation of overlay CP and -- Non-standard interfaces to the overlay CP -- Logically centralized control plane -- No inter-node communication -- Example: VMW/Nicira OF/SDN -- Full and direct control of the Forwarding Plane -- Complete Separation of Control and Data Planes -- Open Interface to the Forwarding Plane -- Logically centralized control plane -- No inter-node communication Dataplane Layer

  2. Modern SDN Architecture Graphic courtesy Levin, D., et al. “Logically Centralized? State Distribution Trade-offs in Software Defined Networks”, HotSDN 2012

  3. “SDN-hard” Problems • Technology • Separation of Control and Data Planes: Control Plane Scalability and Resilience • State Management: logical centralization • Combinatorial state explosion: Feasibility, CAP theorem, … • Control Plane Performance: Ω = RTT(switch2packet) + ppt(switch) + ppt(controller) • Flow Setup Scalability and Performance • Abstractions • Sweet spot: Leverage ideas from distributed systems, programming languages, and other areas to bridge the gap between the centralized controller abstraction and the distributed/hierarchical reality • “southbound” abstraction • Forwarding targets – ASICs and TCAMs • Reasoning Systems • HSA, DSL/FRPs, network compilers, “network as a computer”, …. • Operational Models • And how to you build/operate/debug these networks? • Convolution of policy and configuration • CSN (not Crosby, Stills and Nash) , virtualization, cloud, NDN/ICN, … • Sociology • OF/SDN approach challenges much of our central dogma • Not the least of which are • Circuits vs. Hop-by-hop forwarding • Centralized vs. Distributed control planes • vs “flow-based’ • Shift in influence bases from NetOps  DevOps • Economics • Well…all of the above • Product “de-siloing”

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