Virtualized Networks based on System Virtualization

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1 Virtualized Networks based on System Virtualization 2nd GI/ITG KuVS Workshop on Future Internet Karlsruhe 2008 Andreas Fischer, Andreas Berl, and Hermann de Meer

2 Overview Network Virtualization System Virtualization Background Virtualizing Core Networks based on System Virtualization Virtual, Virtual Link, Virtual Network Conclusions 2

3 Network Virtualization Well known approaches PlanetLab, GENI Programmable / active networks VLANs, VPNs Peer-to-peer overlays Virtualization of routers System virtualization based approach Specific and systematic approach to virtualize routers and networks What happens if system virtualization is applied to core networks (routers and links)? 3

4 System Virtualization Background System virtualization is mainly used to virtualize servers and desktops Virtualization in data centers (e.g. XEN, VMWare ESX Server) Consolidation of services on servers (saving hardware, utilizing resources) Running web and mail server on the same machine - sandboxed Virtualization on desktops (e.g. VMWare Workstation) Testing of new software/drivers Using several Operating Systems simultaneously 4

5 System Virtualization Background A virtual machine monitor (VMM) provides virtual machines on top of a real machine Resources are distributed to virtual machines A virtual machine (VM) is a full recreation of a real machine Virtual CPUs, virtual memory, virtual network interface cards, An Operating System () can be installed in it Several s can run in parallel on top of a real machine VM VM VM VMM 5

6 System Virtualization Background Basic management primitives of VMM Create VM, destroy VM Start VM, stop VM Copy VM, move VM (even live migration of services) Save VM, restore VM System virtualization can be used to virtualize core networks Predetermined network arises Virtual routers, virtual links, virtual networks Network elements gain new features through virtualization 6

7 Virtual Virtual router in the context of system virtualization with routing functionality Encapsulated in a VM Managed by a VMM Virtual routers Are not necessarily aware of other virtual routers Can provide different routing protocols/features on the same (real) machine Have basic management functions VM VM VMM VM Virtual 7

8 Virtual Link Virtual link in the context of system virtualization Logical interconnection of two virtual routers Appearing to them as a direct physical link Properties can change dynamically (e.g. bandwidth) Can traverse more than one physical link Virtual Link VM VM VM VM VMM Phys. Link Phys. Link VMM 8

9 Virtual Network Virtual network in the context of system virtualization Virtual routers that are connected by virtual links They form an undirected connected graph Overlay (or virtual topology) of the virtual network Several independent virtual networks with different overlays can exist in parallel With different network protocols/features Isolated from each other 9

10 Virtual Network Example of two parallel virtual networks with different overlays RM VR a VR b RM VR a VR b Phys. Link Virtual Link of Virtual Network a RM: Real Machine VR: Virtual RM RM VR b VR a VR a VR b Virtual Link of Virtual Network b 10

11 Conclusions System virtualization can be applied to core networks A predetermined network model emerges that consists of Virtual routers, virtual links, virtual networks Overlays are created on top of the physical network System virtualization based networks can be realized with current technologies (e.g. XEN) Proof of concept has been implemented Performance issues 11

12 Appendix 12

13 System Virtualization Background Two popular implementations Full virtualization VMM ( Hypervisor ) located directly on top of real machine, e.g. XEN, VMWare ESX Server Hosted virtualization VMM located on top of, e.g. VMWare Workstation VM VM VM VMM VM VM VM VMM Host 13

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