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Transport SDN: Key Drivers & Elements

This article explores the impact of the evolving WAN landscape on networking, with a focus on architectural choices for WAN, network providers reevaluating total network economics, and the importance of minimizing cross-layer traversals. It also discusses the applications of Transport SDN in dynamic virtual waves and optimized data center interconnect, as well as the collaboration key elements in a Transport SDN demo.

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Transport SDN: Key Drivers & Elements

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  1. Transport SDN: Key Drivers & Elements Chris Liou – Infinera Corp VP Network Strategy cliou@infinera.com

  2. The Evolving WAN Landscape

  3. How does this impact the Network? • Architectural choices for WAN abound – which layers? • Layer 3 (IP) • Layer 2.5 (MPLS) • Layer 2 (Ethernet) • Layer 1 (OTN – digital framing, grooming, switching, protection) • Layer 0 (WDM - optical level transmission, multiplexing, switching) • Network Providers reexamining totalnetwork economics • Lifecycle considerations • Traffic types, patterns & growth sensitivity • Network trends beyond 100G WDM • Minimizing cross-layer traversals (least cost, least power, best perf path) • Maximum network resource utilization & efficiency • Automation & cloud orchestration are needed • Programmability of bandwidth services vs network components • Virtualization & abstraction drive simplicity, but how much?

  4. Applications for Transport SDNDynamic Virtual Waves • Networking-as-a-Service (NaaS) • Layer 1 Virtual Networks (network slicing for multi-tenancy) • Virtual transport switches & virtual bandwidth links • Useful as both Internal partitioning & external service capability • Optimized Data Center Interconnect • Right-sized transport capacity (tunnels) for A-Z flow set • Multi-layer topology integration & resiliency • Multi-layer orchestration & optimization • Simplified orchestration through uniform API • Optimize traffic flows through multi-layer network • E.g., minimize packet processing for Big Data at intermediate sites • Globalized optimization for lowest-cost & highest network utilization

  5. Transport SDN Demo CollaborationKey Elements • Integrated WDM/OTN infrastructure • Dynamic, switched real-time circuits • Bandwidth Virtualization for abstracting optics • Open Transport Switch (OTS) • Virtual transport switch • OpenFlow 1.0 protocol extensions • Transport BW src, dst, size, latency, abstraction level, etc. • GMPLS technologies • Key capabilities well suited for SDN framework • Topology discovery • Robust signaling • Route computation can still be centralized! • SDN Controller & App • OSCARS, OpenFlowJ Bandwidth On Demand App Network Abstractions NB API ESnet Transport SDN Control Layer Discover, Monitor, Control OpenFlow+ Bandwidth Virtualization OTS OTS OTS Converged Transport Network

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