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Key Network Architecture Enablers for Wavelength-on-Demand and L1VPN Services

Key Network Architecture Enablers for Wavelength-on-Demand and L1VPN Services. Chris Liou, Infinera Vijay Vusirikala, Infinera. Outline. Dynamic Wavelength-On-Demand Services & Layer1 VPN Applications Key Application Requirements Architectural Considerations

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Key Network Architecture Enablers for Wavelength-on-Demand and L1VPN Services

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  1. Key Network Architecture Enablers for Wavelength-on-Demand and L1VPN Services Chris Liou, Infinera Vijay Vusirikala, Infinera

  2. Outline • Dynamic Wavelength-On-Demand Services & Layer1 VPN Applications • Key Application Requirements • Architectural Considerations • A Digital Optical Networking Approach

  3. Outline • Dynamic Wavelength-On-Demand Services & Layer1 VPN Applications • Key Application Requirements • Architectural Considerations • A Digital Optical Networking Approach

  4. What is a L1VPN? • A Layer 1 network abstraction that presents a secure, dedicated transport network to the end customer • An alternative to a dedicated physical Layer1 network • May co-exist with other L1VPN instances on the same physical carrier network • Provides end-customer with control & visibility over Layer 1 services between Customer Edges (CEs) • Comprised of a set of CEs & the VPN connections provided by the provider (between Provider Edges (PEs)) • Varied levels of network management control & visibility • Standards efforts in progress (IETF, ITU-T) • GMPLS playing a key role in signaling & routing • E.g., draft-ietf-l1vpn-*, ITU-T SG13

  5. L1VPN Example • Multiple dynamically reconfigurable L1VPNs can co-exist on single carrier network • Enables secure, self-configurable & viewable sub-network • Streamlines customization of dedicated customer virtual network Customer 1 Customer 2 CNM System 1 1 GMPLS 2 2 1

  6. L1VPN & Dynamic WoD Drivers • Basis for new service offerings for wholesale carriers • An alternative to leased point-to-point waves • Rapid reconfigurability of L1 services with minimal carrier intervention • Shifts onus of capacity planning away from carrier and into customer’s own hands • Facilitates internal carrier partitioning of common L1 network • Streamline carrier’s servicing of internal capacity requests • E.g., wholesale carrier providing IP organization with self-configurable L1 transport VPN • Dynamic real-time reconfigurability enables many applications • Dynamic load-sharing based on capacity-on-demand • One-time high bandwidth broadcast events • Timesharing of network capacity • Short-term capacity lease

  7. Outline • Dynamic Wavelength-On-Demand Services & Layer1 VPN Applications • Key Application Requirements • Architectural Considerations • A Digital Optical Networking Approach

  8. Key Elements of L1 VPNs • Management Plane • End-to-end VPN visualization (CNM) & administration • FCAPS • Network planning • Control Plane - GMPLS/ASON • Topology discovery • Route computation • Service provisioning and restoration • Data Plane • Scalable transport & bandwidth management • Multi-service support • Protection and restoration

  9. Key Elements of L1VPNsData Plane Considerations • Service transparency • Zero modifications to wave service • Flexible service mix/options for customer • Multi-rate, multi-protocol • Flexible delivery options for carrier • Efficient network & resource utilization • Future-proof for future higher-speed services (40G, 100GE) • Any-to-any capacity delivery • Carrier-controlled restrictions on data path • Customer options for path diversity • Security • Misconnection detection & avoidance • Isolation between multiple L1VPNs • Data path protection & restoration • Options for protection from network failures • Layer 1 preemption capability

  10. Key Elements of L1VPNsControl Plane Considerations • On-demand “touchless” reconfigurability • Intelligent control plane for streamlined, automated routing & provisioning • Minimal OpEx & lead-times • Evolution path towards dynamic UNI signaling (CE-PE) • Secure & isolated control plane functions • Zero interaction between multiple VPNs • Data & Control Plane separation • Data plane unaffected by control plane failures • Customer traffic engineering options for route diversity

  11. Key Elements of L1VPNsManagement Plane Considerations • Customer Network Management (CNM) • Customer-specific management views of topology, capacity, traffic, services • Automated synchronization with VPN topology • Carrier management of L1VPNs • Bi-directional APIs for advanced service management applications • E.g., policy control • Ease of administration • L1VPN configuration management • Reconfigurability for future L1VPN needs (e.g., higher capacity between sites) • Appropriate hooks for policy management integration • Ease of troubleshooting

  12. CNM view provides L1VPN abstraction Dedicated capacity provisioned between customer sites End-to-end abstraction excludes intermediate NE’s Benefits of L1 VPN control without deploying full WDM network Customer nodal sites dynamically manage bandwidth Leverage carrier field operations Varying degrees of data & control plane isolation Overlay vs shared GMPLS model Dedicated vs shared switching L1VPN Abstraction Customer Network Management view 20G  20G  30G  30G  Customer Network 40G  Carrier EMS/NMS Carrier Network

  13. Outline • Dynamic Wavelength-On-Demand Services & Layer1 VPN Applications • Key Application Requirements • Architectural Considerations • A Digital Optical Networking Approach

  14. L1VPN Service Model OptionsDiscussion • Pre-established vs. On-demand PE-PE capacity • PE-PE cross-sectional capacity needs may evolve over time • On-demand link sizing encourages sharing of capacity across multiple customers • Shared vs. dedicated per-VPN switching • L1 switching function for each VPN can reside “on” or “off-net” • Off-net switching creates natural security partition

  15. L1VPN Service Model Options (contd.)Discussion • Management vs. Signaling based provisioning • Specifies how dynamic circuit configuration is accomplished • Signaling based model generally more broadly discussed • Overlay vs. Peering signaling model (CE-PE) • Signaling only vs. Signaling + Routing model (aka, Basic vs Enhanced Mode • Routing enables automated membership & TE link information exchange • Virtual Node vs. Virtual Link model • Differing abstraction levels of L1VPN capacity • Virtual Link is currently finding favor

  16. L1VPN Service Level Requirements Discussion • Accounting Reporting • Security of provider-customer communication • Data-, control-, and management planes • Data integrity, confidentiality, authentication, and access control • Class of Service (e.g., Availability Class) • Performance Reporting • Fault Reporting • Connectivity Reporting • Policy (e.g., path computation policy, CE-CE signaling pass-through, etc.)

  17. O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O O O O O O Local Add/Drop O O O O O O O O O O ODXC Optical Architecture Options for L1VPNs Local Add/Drop Local Add/Drop Optical Digital Cross-Connect (ODXC) ROADM/WSS Digital Optical Networking • Separate switching + WDM • Digital sub-l switch: ODUk or STS-1/VC-4 • OEO conversion of 100% of WDM traffic • Add/drop, switch, groom 100% of line capacity • All-optical wavelength switching • No wavelength conversion • No sub-l switch, mux and grooming without separate OEO • Transponders only for local add/drop • Integrated switching + WDM • Digital sub-l ODUk switch • Add/drop, switch, groom 100% of line capacity • Client optics only for local add/drop

  18. Outline • Dynamic Wavelength-On-Demand Services & Layer1 VPN Applications • Key Application Requirements • Architectural Considerations • A Digital Optical Networking Approach

  19. Use (analog) photonics for what it does best: WDM transmission Use (digital) electronics for everything else Digital add/drop, switching, grooming, PM and protection… …at every node Unconstrained digital add/drop Any service at any node End-end service delivery independent of physical path Robust digital PM and protection Digital OAMP & management Digital Optical NetworkingFull Reconfigurability at Every Node Digital Electronics & Software Integrated Photonics Integrated Photonics • Sub- add/drop • Digital switching • Signal regeneration • PM & Error correction • Digital Protection • Digital OAMP Truly unconstrained reconfigurable optical networking

  20. 100 Gb/s Transmit 100 Gb/s Receive So why hasn’t Digital Networking been implemented? Because OEO’s are expensive! Discrete Optics Single WDM channel - - - - - - - - - - - - - - - - times 32, 40 or 80 wavelengths

  21. 100 Gb/s Transmit 100 Gb/s Receive Infinera’s Photonic Integrated Circuit Innovation 100 Gb/s Transmit 100 Gb/s Receive 5mm • Direct Benefits • Size, power, cost, reliability • Strategic Benefits • Low-cost OEO conversion allows a Digital Optical Network paradigm

  22. Benefits of Electronics in Optical Networks • Reconfigurable Switching • Wide choice of switching/grooming granularity (VC-4, ODU-1, packet) • Fundamental to managing and grooming customer services • Highest level of reconfigurability • Dispersion Compensation • FFE and DFE can compensate upwards of 1000ps/nm • MLSE can correct upwards of 3000ps/nm dispersion • Significant space savings vs. DCF • Reach Improvement • G.709 standard defines 6dB gain FEC (Reed-Solomon) • High-gain FEC provides optical gain of 8dB to 9dB • Corrects BER of 10-3 to BER of 10-17 • PM and Operations • OTH and SONET/SDH Overhead • Extensive digital PM at all OEO nodes • J0/B1, BIP-8 • FEC bit error rate monitoring • Communication channels for OAM&P • SONET/SDH DCC and OTH TCM

  23. SONET/SDH Networking DS1/3 & E1/3 OC48/STM-16 OC3/STM-1 OCh (DWDM) at 11.1 Gb/s GbE OC192/STM-64 OC12/STM-4 10 GbE LAN PHY STS-1/VC-4 switching OC48/STM-16 OC48/STM-16 OC192/STM-64 ODU1 (2.5G) switching OTU1/OTU2 l1 …lN l1 …lN l1 li, lj . . . . . O-E-O O-E-O O-E-O O-E-O ln O-E-O O-E-O O-E-O O-E-O Evolving to OTN Bandwidth Management OTN Networking • Digital sub-l bandwidth management • End-end digital OAMP & PMs • Robust digital protection • End-end service management Optical/Wavelength Networking (R)OADM switching • Digital sub-l bandwidth management • End-end digital OAMP & PMs • Robust digital protection • End-end service management • Multi-service support • Transparent service transport • WDM scalability and reach • Multi-service support • Transparent service transport • WDM scalability and reach

  24. Conventional WDM Networks Separate WDM & OTN layers Sub-l grooming only with ODXC Manual grooming complexity or extra cost for ODXC Digital Optical Network - OTN Integrated WDM and OTN bandwidth management Sub-l grooming at every node End-end service management, PM and OAM O O O O O O O O O O OXC O O O O O O Integrated Sub- Bandwidth Management ODU1 bandwidth management O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O O-E-O OTUk services Integrated end-end OTN digital optical networking at every node

  25. Digital Optical Network - Characteristics • 100G digital bandwidth increments • Readily deployable capacity usable by any service • Rapid service deployment • Service activation is decoupled from transmission layer design and constraints • Enables efficient protection and restoration schemes • Integrated sub-wavelength bandwidth management • Automated GMPLS end-to-end service activation • Built-in PRBS testing for service readiness • Digital Optical Networking approach provides future-proofing for 40G & 100GbE • Ease of reconfigurability at data plane, control plane and management plane

  26. Optical LSP Request Dynamically Reconfigurable BandwidthGMPLS UNI Router C • Applications of dynamically reconfigurable bandwidth • Dynamic IP load balancing between routers • Multiple circuits to time-share same bandwidth (“Time of day” services) • Digital Optical Networking unlocks full value of GMPLS UNI • 100G+ service-ready capacity on each link • Agnostic to transmission constraints • 2.5G switching granularity A C Router A Router B D B GMPLS UNI Router D IP Virtual Network Topology Dynamically allocatable IP capacity Baseline IP layer connectivity

  27. PIC enabled Digital Optical Networks provide scalable DWDM line capacity to accommodate higher speed services (e.g., 100G) As IP Link sizes exceed optical line rate, IP core requires “Super-” services 100G Layer 1/0 DWDM Layer 3/2 Router <100G> 100GbE SR 100G Serdes 100GbE MAC G.709 &other logic 100GbE SR PhotonicIntegratedCircuit Packet Proc. Fiber Super- Next-gen Services

  28. L1VPN Evolution • L1 VPNs should scale in two dimensions to accommodate future evolution • L1VPN Size and Traffic growth • Control plane and management plane to scale accordingly • Ease of reconfigurability of both logical circuits & cross-connect capacity needs to be maintained • New Services • Today most L1VPN designs want 1G-10G • … with path to 40G & 100GbE services

  29. Summary • L1VPN architecture involves data plane, control plane and management plane • Key Characteristics of L1VPNs • Scalability • Ease of reconfigurability • Customized control • Digital Optical Networking Architecture provides key benefits for L1VPNs • Service layer decoupled from transmission layer • Integrated sub-lambda bandwidth management • End-to-end GMPLS intelligence

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