INTRODUCTION TO NETWORK VIRTUALIZATION
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1 1 INTRODUCTION TO NETWORK VIRTUALIZATION Wednesday, May 14, 2008 Mosharaf Chowdhury Member, envy Project
2 What is Virtualization? 2 Transparent abstraction of computing platform and resources Multiple logical interpretations of the physical characteristics Virtualized everything Virtual machines: VMware, Xen Storage virtualization: SAN Data-center virtualization
3 Network Virtualization for Dummies 3 Making a physical network appear as multiple logical ones Physical Network Virtualized Network - 1 Virtualized Network - 2
4 Why Virtualize? 4 Internet is almost ossified Lots of band-aids and makeshift solutions (e.g. overlays) A new architecture (aka clean-slate) is needed Hard to come up with a one-size-fits-all architecture Almost impossible to predict what future might unleash Why not create an all-sizes-fit-into-one instead! Open and expandable architecture Testbed for future networking architectures and protocols
5 Related Concepts 5 Virtual Private Networks (VPN) Virtual network connecting distributed sites Not customizable enough Active and Programmable Networks Customized network functionalities Programmable interfaces and active codes Overlay Networks Application layer virtual networks Not flexible enough
6 Network Virtualization Model 6 Business Model Architecture Design Principles Design Goals
7 Business Model 7 Players Relationships Infrastructure Providers (InPs) Manage underlying physical networks End User Service Providers (SPs) Create and manage virtual networks SLA Deploy customized end-to-end services Broker Service Provider EIA End Users Buy and use services from different service providers NPA Infrastructure Provider SIA Brokers Mediators/Arbiters IIA
8 Architecture 8
9 Design Principles 9 Concurrence of multiple heterogeneous virtual networks Introduces diversity Recursion of virtual networks Opens the door for network virtualization economics Inheritance of architectural attributes Promotes value-addition Revisitation of virtual nodes Simplifies network operation and management Hierarchy of Roles Service Provider N Virtual Network N Service Provider 1 Virtual Network 1 Service Provider 0 Virtual Network 0 Infrastructure Provider N+1 Infrastructure Provider 2 Infrastructure Provider 1 Infrastructure Provider 0
10 Design Goals (1) 10 Flexibility Service providers can choose arbitrary network topology, routing and forwarding functionalities, customized control and data planes No need for co-ordination with others IPv6 fiasco should never happen again Manageability Clear separation of policy from mechanism Defined accountability of infrastructure and service providers Modular management
11 Design Goals (2) 11 Scalability Maximize the number of co-existing virtual networks Increase resource utilization and amortize CAPEX and OPEX Security, Privacy, and Isolation Complete isolation between virtual networks Logical and resource Isolate faults, bugs, and misconfigurations Secured and private
12 Design Goals (3) 12 Programmability Of network elements e.g. routers Answer How much and how Easy and effective without being vulnerable to threats Heterogeneity Networking technologies Optical, sensor, wireless etc. Virtual networks
13 Design Goals (4) 13 Experimental and Deployment Facility PlanetLab, GENI, VINI Directly deploy services in real world from the testing phase Legacy Support Consider the existing Internet as a member of the collection of multiple virtual Internets Very important to keep all concerned parties satisfied
14 Definition (Sort of) 14 Network virtualization is a networking environment that allows multiple service providers to dynamically compose multiple heterogeneous virtual networks that co-exist together in isolation from each other, and to deploy customized end-to-end services on-the-fly as well as manage them on those virtual networks for the end-users by effectively sharing and utilizing underlying network resources leased from multiple infrastructure providers.
15 Existing Projects 15 Four general categories 1. Networking technology IP (X-Bone), ATM (Tempest) 2. Layer of virtualization Physical layer (UCLP), Application layer (VIOLIN) 3. Architectural domain Network resource management (VNRMS), Spawning networks (Genesis) 4. Level of virtualization Node virtualization (PlanetLab), Full virtualization (Cabo)
16 Future Works 16 Four general directions 1. Instantiation Creates virtual networks 2. Logistics Runs them 3. Management Manages them 4. Interactions Let them flourish
17 Reference 17 N.M. Mosharaf Kabir Chowdhury, Raouf Boutaba, A Survey of Network Virtualization, University of Waterloo Technical Report CS , Oct
18 18 Questions? // Comments
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