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Why OpenFlow /SDN Can Succeed Where GMPLS Failed

Why OpenFlow /SDN Can Succeed Where GMPLS Failed. Saurav Das , Guru Parulkar , Nick McKeown. MPLS. a mechanism for forwarding packets for any network protocol. d evelopment: originally developed in the late 1990s to provide faster packet forwarding for IP routers

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Why OpenFlow /SDN Can Succeed Where GMPLS Failed

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  1. Why OpenFlow/SDN Can Succeed Where GMPLS Failed Saurav Das , Guru Parulkar , Nick McKeown

  2. MPLS • a mechanism for forwarding packets for any network protocol. • development: • originally developed in the late 1990s to provide faster packet forwarding for IP routers • the de-facto standard for many carrier and service provider networks • deployment scenarios continue to grow

  3. MPLS • illustration:

  4. GMPLS • conceptually similar to MPLS • difference from MPLS: • some physical property of the received data stream is used to deduce which LSP it belongs to • the most commonly used schemes • Timeslot -on a Time Division Multiplexed (TDM) link • Wavelength -on a Wavelength Division Multiplexed (WDM) link • fiber or port

  5. SDN based Unified Control Architecture

  6. The common-map abstraction: • provides full visibility into both packet and circuit switched networks • abstracting away the complexity of state-dissemination from applications • The common-flow abstraction : • flow-tables that take the form of lookup-tables in packet switches and cross-connect tables in circuit switches.

  7. GMPLS vs SDN • Shortcomings of GMPLS and Advantages of the SDN • Control plane complexity • Lack of the common map-abstraction • Lack of a gradual adoption path

  8. Control plane complexity • GMPLS: • The amount of extensions that have gone into the protocols • RSVP: • IntServ+ MPLS-TE + GMPLS +UNI interface • SDN: • Use switch-API,network-OS replace : • protocols like OSPF,RSVP • interface like the uni • vendor proprietary islands and interface

  9. Lack of the common map-abstraction • As a result • a) services available to IP network are limited to the exact service-level definitions defined • b) the distributed implementation of network-functions across packets and circuits require lots of glue-code, and patchwork to existing protocol.

  10. Lack of a gradual adoption path

  11. Reference • www.openflow.org/wk/images/4/40/Abstract.pdf‎ • SDN Based Unified Control Architecture Saurav Das, Guru Parulkar and Nick McKeown • http://network-technologies.metaswitch.com/mpls/what-is-mpls-and-gmpls.aspx

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