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A Practical Design and Implementation Approach Marc Teichtahl marc.teichtahl@versatel.nl

A Practical Design and Implementation Approach Marc Teichtahl marc.teichtahl@versatel.nl marct@layerthree.com. Presentation overview. Design overview Why packet rings ? Current designs Removing the transport layer DTP basics Robustness and resilience Aplanned case study.

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A Practical Design and Implementation Approach Marc Teichtahl marc.teichtahl@versatel.nl

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  1. A Practical Design and Implementation Approach Marc Teichtahl marc.teichtahl@versatel.nl marct@layerthree.com

  2. Presentation overview • Design overview • Why packet rings ? • Current designs • Removing the transport layer • DTP basics • Robustness and resilience • Aplanned case study

  3. Design Overview Design Brief “effect the migration from traditional transmission technologies to a next generation platform optimized for the transmission of purely packetized data”

  4. Why packet rings ? • Reduction in capital expenditure • No more SDH/SONET ADM’s • More efficient use of bandwidth • statistical multiplexing and spatial resuse • Single management infrastructure

  5. ADM OC-3 OC-3 POS POS ADM ADM ADM Current Design SDH Tributaries

  6. Whilst robust, this design tends to be inefficient when dealing with purely packetized data • Dedicated protection time slots reserve half the ring at all times. • Fixed size Point to Point circuits provisioned regardless of actual bandwidth use. • Cost and complexity reduced as we remove transport layers from the network.```

  7. Working Provisioned Circuit ADM ADM Protection

  8. Removing the transport layers Today Traditional Tomorrow IP IP Over ATM POS IP IP ATM IP-OG IP ATM SONET SONET Optical Optical Optical Optical Lower Cost, Complexity, & Overhead

  9. DPT Basics Inner Ring Control Outer ring data Outer ring control Inner ring data

  10. 2 Rings - Inner and Outer • Data and control in opposite directions • Both fibers used concurrently • Accelerated control propagation for adaptive bandwidth utilization and self-healing.

  11. Framing • Utilizes SONET/SDH framing • Runs over all key fiber transport technologies • Dark Fiber • WDM • SONET/SDH point to point and ring

  12. Bandwidth Multiplication • Spatial re-use - SRP Traditional ring technologies use source stripping. This is in efficient, SRP uses destination stripping. Destination stripping allows the destination node to remove the packet from the ring freeing up bandwidth on other non-related paths.

  13. Bandwidth Multiplication • Dual Fiber Both fibers carry “working” traffic. This is unlike SONET which uses dedicated protection bandwidth. Implemented in an existing network DTP can yield 1:2 (x2) bandwidth multiplier.

  14. Bandwidth Multiplication • Statistical Multiplexing No TDM and no provisioned circuitsProvides for statistical over subscriptionCan handle elastic burst requirements

  15. Robustness and Resilience • Intelligent Protection Switching (IPS)Proactive monitoring and and self-healing throughstandard SONET/SDH overhead bytes.50ms self-healing layer 1 wrappingProtection switching hierarchy for multiple concurrent failures

  16. Robustness and Resilience • Intelligent Protection Switching (IPS)Doesn’t rely on SONET overhead bytes allowing foruse non-SONET infrastructure such as WDM50ms IP restorationMulti-layer aware, the router can now see all 3 layers

  17. A planned case study 4 Phase implementation plan • Single node SDH tributary • Semi-Hybrid transport network • Hybrid network • Full DPT network

  18. Single node SDH tributary SDH DPT IP

  19. Semi-Hybrid transport network SDH DPT DPT IP END TO END

  20. Hybrid network IP only IP only

  21. Full DPT network OC-12 OC-12 OC-12 OC-12 IP ONLY END TO END TRANSPORT LAYER IS COMPLETELY TRANSPARENT

  22. Amsterdam Den Haag OC-12 Rotterdam OC-12 OC-12 Antwerp OC-12 Brussels

  23. Amsterdam • 3 phase implementation • Semi-hybrid trial Amsterdam -> Brussels Point to point • Hybrid trial Amsterdam -> Brussels Loop • Full DTP Full DTP loop Den Haag OC-12 Rotterdam OC-12 OC-12 Antwerp OC-12 Brussels

  24. Presentation available at ftp://ftp.layerthree.com/pub/nanog16.ppt email me marct@layerthree.com

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