Photonic Routers Supporting Application-Driven Bandwidth Reservations at Sub-Wavelength Granularity

Transcription

1 Photonic Routers Supporting Application-Driven Bandwidth Reservations at Sub-Wavelength Granularity D.Simeonidou, G. Zervas, R. Nejabati Photonic Networks Laboratory Electronic Systems Engineering Dept University of Essex, UK Colchester CO4 5UT

2 New Considerations for Optical Networking Research Networks are expected to support an increasingly diverse set of applications Telecommunications, Grid, escience, ehealth, estorage, econtent, emerging broadband services (infotainment, interactivity, mobility, 3-D imaging ) Demands triggered by applications are having direct impact on the network data and control plane technologies Advances in networking technologies Support the evolution of existing applications Enable the emergence of new applications Optical networks already play an important role in supporting new applications and services Optical networks research had/has to fit into the new overall network scenario

3 Applications & Networks Convergence Convergence of applications & networking research: drives a revolution in networking creating new network models and architectures: Optical network architectures for new service delivery models Dynamic, multi-service, user/application controlled networks, application aware optical networks, etc New concepts for network and service management Network information and control exposed to the service layer Higher layer intelligence migrating in the network layer Service oriented networks or service aware networks Intelligent networking providing advanced application driven services (collaborative services)

4 Collaborative Network Services What are collaborative network services? A collection of network resources deployed by shared and geographically distributed facilities (user terminals, instrumentation, computing, storage, digital repositories, archives ) Why collaborative network services? Science, research, education, medicine, business have no bound and are based on collaboration of international expertises Creation of distributed virtual facilities for sharing resources

5 Trends in Collaborative Network Services Today s optical network infrastructure for collaborative services Data intensive users (mainly scientific) Optical network provides dedicated end-to-end high-bandwidth (λ) connections Well known virtual organisations Static or semi-static point-to-point connections long-lived wavelength paths between client and resources Centralized service management strategies Emerging collaborative services: Need infrastructures that makes vast amount of storage and computation resources potentially available to a large number of users. Distributed virtual laboratories Digital libraries and data repositories Remote medicine Consumer services: immersive interactive learning environments and gaming

6 Application Driver: e-science e-science: global, large scale scientific collaborations enabled through distributed computational and communication infrastructure radio astronomy Electronic Very Long Baseline Interferometry (evlbi) 2005 ~= 512mbs -> 1 Gbs 2006 up to 20 Gbs 2008 up to 40+ Gbs

7 Application Driver: Radio Astronomy Experiments Gbit link Chalmers University of Technology, Gothenburg Onsala Sweden Gbit link Torun Poland MERLIN Jodrell Bank UK Dedicated Gbit link Westerbork Netherlands Cambridge UK Medicina Italy Dwingeloo DWDM link

8 Evolving Collaborative Services: Global Distributed Virtual e-science Laboratories Example :Neptune Project Joint US-Canadian project to build large undersea fiber network (British Columbia, Washington, Oregon) Interconnect instrumentation devices, robotic submarines, sensors, cameras Oceanography, seismology, deep sea ecology Distributed computing and data storage devices on CA*net 4 and Internet 2 will be used to analyze and store data All devices available to researchers connected to CA*net 4 and Internet 2 networks

9 Application Driven Optical Network-Evolution 1 Distributed, shared resources interconnected by plentiful bandwidth (DWDM) Wavelength switching Data intensive applications can ask the optical network for any point-to-point connectivity High bandwidth dedicated links, dynamically allocated on-demand or by scheduled reservation

10 The Optical Network Backbone for High Performance-Data Intensive Applications IP Network User Data Intensive Application Data/ Query Application middleware Resource Broker Data/ Query Data/ Query Resource Information Data/ Query Computational Resource DATA Lightpath provisioning API DATA Physical layer adaptation OUNI (standardised) GMPLS Control Plane (traditional) Optical Transport Network Physical layer adaptation OXC 1 OXC 2

11 New Applications and User Requirements are Emerging Increasingly organisations, societies or individuals want to communicate, access information or collaborate using networks Need infrastructures that makes vast resources potentially available to a large number of users Service oriented network concept must be extended to wider group of users CHALLENGE Define generic network architecture that can adapt to any user and service requirements

12 Application Driven Optical Network-Evolution 2 Optical Burst Switching (OBS) OBS can provide transport for highly demanding collaborative applications Offers sub-wavelength granularity and high spectral efficiency Accommodates medium and large size jobs Short lived & long lived relationships From packet level to circuit (wavelength) level Burst terminal can communicate directly with multiple destinations across a network Native mapping between bursts and jobs

13 Programmable OBS Networking: An Infrastructure for Collaborative Services Focus is to : Enable network to directly offer resources (network and data) as service To migrate service layer functionality close to the optical layer Network elements are able to recognise and process application demands/request To offer resources as a service To facilitate intelligent discovery of distributed resources across the network To cope with random changes user patterns, demands for resources (storage/processing) as well as availability of resources To provide network with self-organisation ability Topology set-up

14 Job Construction Scheme: User/Application Side Complete User Job Second stage First stage 2. Data Burst Actual Job Non-Active Burst Control Packet Job Header Non-Active Non-Active Burst Actual Job 1. Data Burst Job Specification Active Burst Control Packet Resource Request Active Active Burst Job Spec. Offset time Offset time job ID source node Actual job data job ID Payload Type Non-Active OBS parameter Payload length Offset time job ID source node job requirements BW Processor Memory Deadline job ID Payload Type Active OBS parameter Payload length Offset time

15 Active OBS Router Architecture Centre to the programmable OBS network is ACTIVE OBS ROUTER Normally routers perform forward functionality The Active OBS router performs compute-forward functionality (i.e. compute on Job requests) Routing engine: optical switch Processing engine: high performance NP Managment Application Programming Interface (API) Policy Scheduler Block Mapper Pattern Matching Network Processor Data Queue Manipulation Management Memory Switch Fabric Interface User controlled networking functionalities: Quality of service (Data and Network) Reliable multicast CBR BCP O/E/O Electronic Interface Active Burst Processor Active Network Interface E/O Active Port Burst Passive Port Data Plane

16 Network Scenario Small User Computational & storage resources Traditional OBS User Traditional OBS User Computational & storage resources OBS Router Active OBS Router Scientific User Computational & storage resources Traditional OBS User Principle of networking concept Some OBS router in network topology are active nodes Active OBS routers must performs resource discovery algorithm on user requests Other OBS routers simply route and forwards the Burst

17 Job Submission and Execution The application submits a service request (BW + Resource) to the middleware, which processes it and forwards it to the network ingress node The edge device will formulate the client request into an active burst The active burst will be multicasted to active routers in the network for resource discovery The result of resource discovery will be sent back to the application/user by the active routers. The application/user chooses one of the possible optical path+resources The application data is encapsulated into a passive data burst and routed to the selected resource

18 Hybrid Optical Burst/Circuit Switching (OBCS) for future applications Optical networking should optimally serve users/applications with diverse network requirements (BW, latency, setup time etc.) without compromising the network utilisation Application-aware optical-burst/circuit switched (OBCS) network is a promising solution Optical circuit switching (OCS) addressing bandwidth requirements for data intensive services (particle physics, radio-astronomy) involving well-known scientific user communities through long lived wavelength paths Optical burst switching (OBS) addressing bandwidth and network requirements for increasing emerging and evolving applications (e-health) Short lived bandwidth reservations Solution: Hybrid OCS/OBS networks

19 Hybrid Optical Burst/Circuit Switched Ingress Edge Router Input Line card Switch O U T P U T PCS AS OCS RAS E/O Headers L I N E OBS E/O Forwa rding Engin e C A R D CoS - Parser Assembly/ Queuing Buffer E/O Output/ Scheduling Buffer Input line card Forwarding engine Output line card CoS provisioning Assembly (Burst or Circuit) Resource allocation (E/O)

20 Hybrid OBCS Ingress Router Architecture IP Traffic 2.5 Gbps Traffic Differentiation CoS λ-allocation Buffers Scheduler OB Generation OC Generation BCH Generation FPGA Prototype Board Optical amplifier 4-1 coupler Polarization controller DAC DAC SG-DBR 2.5 Gbps Mach-Zehnder modulator DFB 2.5 Gbps λ1, λ2, λ3, λ4, λ5 Hybrid OBCS Ingress Router architecture incorporates High-speed packet classification Optical circuit generation Optical Burst aggregation and generation Wavelength allocation

21 Edge Router Results 10 Gbps Optical circuit and bursts over 4 different wavelengths 200 ps/div OCS a) OBS 200µs/div Asynchronous Optical Burst nm Ethernet Switched (OBES) control plane (continuous data) nm nm nm nm BCH offset λ1 Asynchronous aggregation and transmission of variable length bursts with variable offset times (Burst mode) λ2 λ3 b) 6 µs/div λ4 λ db Burst Control Header (BCH) over c) OBES control plane at 2.5 Gbps c). 2.5 Gbps 10 ns/div

22 Core OBS Node Technology Traditionally OBS switches are based on slow switching technology (e.g. MEMs) Suitable for long bursts with large offset time Not suitable for networks with large number of users transmitting small data bursts Not efficient for short bursts with short offset time Combination of fast and slow optical switching technology is emerging for future OBS networks SOA based switch technology for fast switching MEM based switch technology for slow switching

23 Core OBS Node Architecture Control Header Processing OXC mxm IM F P G A b o a r d PM Parallel to serial I R D/A C Optical Burst Switch Control 1 EAM 4 λ conv1 SOA GCSR Tun. Laser λ 1 λ 4 EDFA I C D/A C Serial to parallel λ conv2 Label Extraction 2 SOA DI: 6.45cm EDFA λ conv3 SOA AWG SOA 6dB 10% 90% CCU λ conv4 3 λ 0 Optical Packet Switch input SOA Power adjustment Power mon Power adjustment Power mon Power adjustment Power mon Combiner Combiner Combiner λ9 λ16 λ9 λ16 SMU1 MEM λ EDFA λ Drop Power mon Power mon Power mon CDU EDFA EDFA EDFA 8x8 SMU8 MEM8 l 1 l m ADD λ 1 Fast Switch OXC mxm λ n λ 1 λ n O E Fast Switch

24 Edge & Core Routers Fast SOA-Based Switch Slow Mem-based Switch FPGA GCSR Tunable Laser Burst Generator + Tuneable laser

25 Conclusions Technology trends for application driven (service-oriented) optical network infrastructure. Existing wavelength switched network infrastructure Novel programmable network architecture based on active optical burst switching Transport format has been tailored to provide network level application awareness Architecture utilizes advanced hardware solutions and new protocols

26 Thank you