Extending Network Virtualization into the Optical Domain


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Check out Jörg-Peter Elbers and Achim Autenrieth's OFC/NFOEC Cloud Symposium slides on extending network virtualization into the optical domain

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Extending Network Virtualization into the Optical Domain

  1. 1. Jörg-Peter Elbers, Achim Autenrieth OFC/NFOEC 2013 - Cloud Symposium Extending Network Virtualization into the Optical Domain
  2. 2. © 2013 ADVA Optical Networking. All rights reserved.22 Outline • Introduction • Optical Network Virtualization • Prospects, Challenges & Solutions • Summary
  3. 3. © 2013 ADVA Optical Networking. All rights reserved.33 Cloud Data Centers Virtualization is a key concept to pool servers, storage and appliances and share them in a flexible and dynamic way. Virtual serverVirtual network Virtual storage Orchestration of IT & network resources Storage pool Fabric interconnect Server pool
  4. 4. © 2013 ADVA Optical Networking. All rights reserved.44 Network Virtualization - Definition Any form of partitioning or combining a set of network resources, and presenting it in an abstracted form to users such that each user, through his set of resources, has a unique, separate view of the network. [Wang et al., JLT, 12/2012] User: Data center tenants, virtual machines, workloads or applications. Resources: Fundamental (nodes, links) or derived (topologies), can be virtualized recursively. Requirements: User isolation, configuration independence, elasticity and programmability. Virtual Network 1 Virtual Network 2 Networks 1 & 2
  5. 5. © 2013 ADVA Optical Networking. All rights reserved.55 Network Virtualization in Data Centers • Overlay VLANs over IP or Ethernet tunnels: NVGRE, VXLAN, STT, SPB encapsulation • Separate virtual & physical address space, alleviate LAN segment & IP subnet restrictions. IT resources can be allocated, moved and scaled - decoupled from the physical network infrastructure. Data Center Fabric VM VM VM VM VM VM vSwitch vSwitch vLANs
  6. 6. © 2013 ADVA Optical Networking. All rights reserved.66 Role of Optics Optical Underlay Optical ADVAntage: Low latency, high transfer speed, guaranteed performance Optical Bypass Optical switch to change fabric connectivity Optical switch for direct cluster connectivity
  7. 7. © 2013 ADVA Optical Networking. All rights reserved.77 Virtualization Beyond DC Boundaries Web 2.0 data centers Global carriers From “warehouse-scale computers” to “the network is the computer”.
  8. 8. © 2013 ADVA Optical Networking. All rights reserved.88 Metro connectivity: • Data center distances < 100km • Ethernet, Fiber Channel, some Infiniband • DWDM w/ minimum processing (latency) Optical Network Virtualization Core connectivity: • Globally distributed data centers • IP/MPLS over OTN/DWDM • Standard core network technologies Metro Core Increased resource efficiency and reduced interconnection costs by optical capacity sharing. Programmable optical connectivity for cloud data center operators & tenants
  9. 9. © 2013 ADVA Optical Networking. All rights reserved.99 Use Cases Bandwidth calendaring Cloud bursting Secure multi-tenancyWorkload balancing Transactional nature of DC-to-DC traffic (bulk data transfers) offers opportunities for optical bandwidth-on-demand. Cloud DC Private Datacenters Tenant 1 Tenant 2Load Load
  10. 10. © 2013 ADVA Optical Networking. All rights reserved.1010 Use Case Analysis Uniform node-to-node traffic > 30% node capacity savings from shared model if excess traffic > base traffic. 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 NetworkUtilization Time base traffic excess traffic 0% 10% 20% 30% 40% 50% 60% 70% 80% Nodecapacitysavuings Excess traffic / base traffic Shared vs. dedicated resource model N = 4 N = 8 Dedicated node resources for base traffic Model a): dedicated resources for excess traffic Model b): shared resources for excess traffic
  11. 11. © 2013 ADVA Optical Networking. All rights reserved.1111 Optical Virtualization Challenges Packet Switch Optical l-Switch Signal format Digital electronic Analog optical Signal structure Ethernet frames Signal dependent Payload visibility Yes No Topology discovery In-band (e.g. LLDP) Out-of band (e.g. OSC) Fabric connectivity Any-to-any Constrained Path feasibility Implicit Dep. on signal quality Path set-up Any order Sequential Analog nature and switching constraints make optical networks difficult to virtualize.
  12. 12. © 2013 ADVA Optical Networking. All rights reserved.1212 Optical Virtualization – Two Extremes • Virtualization on fundamental level • All nodes and links are exposed • Direct hardware representation • Highest flexibility for tenants/applications • Users need to control/understand optical layer • Virtualization on highest derived level • Network abstracted as one large switch • Can be l-, circuit or packet switch • Users see switch as black box • Internal structure & optical layer are hidden Compromise necessary: Hiding optical complexity while exposing topology.
  13. 13. © 2013 ADVA Optical Networking. All rights reserved.1313 Optical Virtualization – SDN Control Abstraction Topology DB Flow DB Configuration PathCompute Provisioning PolicyManager Resource DB Fault&alarms Accounting Performance Security Management Policy DB Control ResourceMgr Database TopologyDisc Network Controller Network Hypervisor Restful API with Extensions vNetwork Controller vNetwork Controller PhysicalressourcesDerivedtopology
  14. 14. © 2013 ADVA Optical Networking. All rights reserved.1414 Generalized architecture for dynamic infrastructure services OpenFlow in Europe – Linking Infrastructure and Applications Towards Automated Interactions between the Internet & Carrier- Grade Management Ecosystem Research Activities
  15. 15. © 2013 ADVA Optical Networking. All rights reserved.1515 Summary • Optical network virtualization offers cloud providers & tenants high-bandwidth, low-latency connectivity on demand. • Different models for optical network virtualization exist. • A compromise between hiding the optical complexity and exposing the optical topology is required. • Open approaches based on standardized GMPLS or emerging OpenFlow technologies are possible.
  16. 16. jelbers@advaoptical.com Thank you IMPORTANT NOTICE The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited. The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation. Copyright © for the entire content of this presentation: ADVA Optical Networking.