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ECOC 2018 - FlexE Delivers
- 1. Can FlexE Deliver on Promises for Programmable and Dynamic Optical Networking? Dave Brown, President, OIF; Nokia ECOC 2018 Rome, Italy
- 2. Can FlexE Deliver on Promises for Programmable and Dynamic Optical Networking? Abstract: The diverging evolution of Ethernet and WDM network transport rates creates inefficient bandwidth utilization in transport networks. OIF FlexE provides a solution that helps optimize channel capacity and enables agility and dynamism capabilities envisioned for next generation transport applications. • David Brown: President, OIF; Nokia • Steve Trowbridge: Editor, FlexE IA, OIF; Nokia
- 3. Agenda • What is FlexE? • Why FlexE? – Trends and Challenges • OIF FlexE 1.0 Implementation Agreement • Applications • FlexE OIF IA Evolution and Market Adoption • FlexE 2.0 • Conclusion
- 4. What is FlexE? • Flex Ethernet (FlexE) is a new flexible Ethernet client interface implementation agreement (IA) defined by the OIF in 2016 • Supports a variety of Ethernet MAC rates that do not necessarily correspond to existing Ethernet PHY rates • Enables new ways to more efficiently use network bandwidth
- 5. Why FlexE? Trends and Challenges • Cloud-based services require highly programmable, agile and efficient optical transport networking • Programmable coherent DSPs, flexible grid networking, Flex OTN and open, software- defined networks show promise • Mismatch of Ethernet interface data rates and transport interface line rates limits potential
- 6. The Evolution of Ethernet and Transport Line Interface Data Rates • Ethernet: steps of 10x every 7 years • Transport: 4x every 2 years • Coincidental convergence at 10G • Engineered convergence at 100G • New transport line rates emerged e.g. 150G, 250G • Evolution mismatch 10G 25G 40G 50G 100G 200G 400G 50GBPSK 100GDP-QPSK Varying Modulation (DP-QPSK, DP-8QAM, DP-16QAM, DP-32QAM, DP-64QAM), varying Baud rate,Probalistic Shaping 500G 600G Discrete or Flexible Coherent Line Interface Rates 100G 200G 400G 300G Discrete Ethernet Rates Discrete Ethernet and Flexible Coherent Line Interface Rates
- 7. OIF FlexE 1.0 • Objectives: – Address modern transport applications e.g. DCI – Provide efficient link bonding • Matches client rates to variable line rates – Decouples Ethernet client rates from physical interface rates • Service bandwidth allocated as needed – Optimizes network efficiency – Simplifies network planning and management
- 8. FlexE Structure and Capabilities Key capabilities: • Bonding of multiple links • Sub-rating of links • Channelization of links FlexEShim Bonded Ethernet PHYs (FlexE Group) FlexEClients FlexEClients FlexEShim FlexE Structure
- 9. Bonding of Multiple Links • Create a higher-speed link out of multiple Ethernet PHYs • Example: support a 500G MAC connecting data centers over five bonded 100GBASE-R PHYs • Avoids the hashing inefficiency and maximum flow size limitations of LAG EquipmentA QSFP 28 QSFP 28 QSFP 28 QSFP 28 500Gbps DataPipe EquipmentB QSFP 28 QSFP 28 QSFP 28 QSFP 28 500Gbps DataPipe 100GE FlexE PHY 100GE FlexE PHY 100GE FlexE PHY 100GE FlexE PHY PCSPCSPCSPCS PCSPCSPCSPCS MAC&66bEncoding FlexESHIM MAC&66bEncoding FlexESHIM QSFP 28 QSFP 28 100GE FlexE PHY PCS PCS FlexE Group
- 10. Sub-rating of Links • Use a portion of a link i.e. Ethernet PHYs • Hybrid example: Support a 250G MAC as a sub-rate of a bonded group of three 100GBASE-R PHYs • Essentially reduces Ethernet rates to match lower- speed DWDM line rates EquipmentA QSFP 28 QSFP 28 QSFP 28 250Gbps DataPipe EquipmentB QSFP 28 QSFP 28 QSFP 28 250Gbps DataPipe 100GE FlexE PHY 100GE FlexE PHY 100GE FlexE PHY PCSPCSPCS PCSPCSPCS MAC&66b Encoding FlexESHIM MAC&66b Encoding FlexESHIM FlexE Group
- 11. Channelization of Links • One link carries several lower-speed or sub-rated links from different sources with a PHY or a group of bonded PHYs • Example: Support one 150G and two 25G MACs over two bonded 100GBASE-R PHYs • Enables more efficient mapping of multi-rate services EquipmentA QSFP 28 QSFP 28 150Gbps DataPipe EquipmentB QSFP 28 QSFP 28 150Gbps DataPipe 100GE FlexE PHY 100GE FlexE PHY PCSPCS PCSPCS MAC&66b Encoding FlexESHIM MAC&66b Encoding FlexESHIM FlexE Group 25Gbps 25GbpsMAC MAC MAC MAC 25Gbps 25Gbps
- 12. Key Properties of FlexE (1/2) • Backwards compatibility with existing physical layer solutions • Reuses many Ethernet mechanisms • Uses standards-defined physical lanes • Backwards compatibility with existing transport infrastructure
- 13. Key Properties of FlexE (2/2) • Options for FlexE-aware transport • Utilization of the entire aggregated link • Low added latency • Transport friendly
- 14. FlexE Applications • Router-to-transport connection • Intra-Data Center “Fat Pipe” application • Generalized MLG applications
- 15. Router-to-transport Application • FlexE Unaware Transport – Allows a router to create a FlexE group of greater than 100G capacity by bonding multiple 100GBASE-R PHYs 400Gbps DataPipe 300Gbps DataPipe 100G 100G FlexESHIM FlexESHIM FlexE Group 100GE FlexE PHYs 100G 100G 100Gbps per wavelength (DP-QPSK) 100G 100G 100G 100G
- 16. Router-to-transport Application • FlexE Terminating Transport – The entire bonded aggregate signal can be carried over a single coherent line interface, or over a multiple sub- carrier coherent signal on a single line card, or for the case of channelization where lower-order sub- wavelength (ODUflex) switching 50G 250G FlexEShim FlexEShim 100GE FlexE PHY 100GE FlexE PHY 100GE FlexE PHY FlexEShim 250G 100GE FlexE PHY 100GE FlexE PHY 100GE FlexE PHY 100GE FlexE PHY FlexEShim 250G 150G FlexEShim 100GEFlexEPHY 100GEFlexEPHY FlexE Shim 50G 150G OTN Network
- 17. Router-to-transport Application • FlexE Aware Transport – FlexE group is distributed over multiple transponder line cards and the coherent line rate is not a multiple of the FlexE PHY rate e.g. 100G 300Gbps DataPipe 300Gbps DataPipe FlexESHIM FlexESHIM FlexE Group 100GE FlexE PHYs 75G Data per 100GE PHY 150Gbps per wavelength (DP-8QAM)
- 18. FlexE Advantages and Benefits • Adjust service bandwidth to meet dynamic needs remotely - no truck rolls • Optimize bandwidth utilization • Leverage existing infrastructure • Simplify network planning and management Improves network ROI
- 19. FlexE OIF IA Evolution and Market Adoption OFC 2016 Commercial components introduced April 2015 Initial Proposal July 2015 1st Straw Ballot Oct. 2015 2nd SB Jan. 2016 Principal Ballot March 2016 1.0 IA Published OFC 2018 OIF/EA 400G FlexE Demo OFC 2018 OIF FlexE 1.1 Demos 2018 System-level implementations June 2018 2.0 IA Published
- 20. The Next Step - FlexE 2.0 • IA published June 2018 • Support for FlexE Groups composed of n x 200 Gb/s Ethernet PHYs and n x 400 Gb/s Ethernet PHYs • Support for synchronous Ethernet applications
- 21. Conclusion • FlexE is a key tool that helps: – Optimize bandwidth utilization – Dynamically allocate capacity on-demand per application or user need • FlexE complements other key technologies – Highly programmable DSPs, flexible grid ROADMs, FlexOTN, and SDN/open APIs • FlexE improves network efficiency and agility FlexE delivers on the promise for programmable and dynamic optical networking
- 22. Resources • ECOC 2018 Invited Paper: Can FlexE Deliver on Promises for Programmable and Dynamic Optical Networking? – David Brown, Steve Trowbridge • OIF • OIF-FLEXE-01.0 – Flex Ethernet Implementation Agreement • OIF-FLEXE-02.0 – Flex Ethernet 2.0 Implementation Agreement
- 23. Acknowledgements • Co-author: Steve Trowbridge, Editor, FlexE IA, OIF; Nokia • OIF: Brian Holden, Faisal Dada, Dave Ofelt, and for reuse of figures • Nokia: Kyle Hollasch