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Talk given as part of eduPERT Performance U! 2013-03-07
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Software-Defined Networking
1.
© SWITCH 2013 Software-Defined
Networking Simon Leinen Team Leader, Peta Solutions simon.leinen@switch.ch eduPERT Performance U! 2013-03-07
2.
© SWITCH 2013 What
is SDN and why should I care? 2
3.
© SWITCH 2013 Why
SDN? • Networking software-defined anyway? • Well yes, but… (is that of any use to us?) – Vertical integration dominates: Hardware, OS, “applications” all in a (closed) box – Network-wide functions defined by protocols Results: • Resistance to innovation (“fossilization”) • Cost/performance issues 3
4.
© SWITCH 2013 Drivers
towards SDN • Researchers who want to “innovate” – Future Internet/”Clean Slate” initiatives • “Warehouse-scale computing” (Cloud) – Need to build scalable, cost-effective fabrics – Research shows it can be done (VL2, Portland etc.) using fat trees/leaf+spine and multipath load balancing (e.g. Valiant) at edge 4
5.
© SWITCH 2013 Data
Center Networks 5Source: “A simpler data center fabric emerges”, Lippis White Paper
6.
© SWITCH 2013 Data
Center Networks 6 Source: A simpler data center fabric emerges, Lippis White Paper
7.
© SWITCH 2013 Leaf-spine
traffic flow (multipath) 7 Source: Interop 2012 talk by Brad Hedlund Architecting Data Center Networks…
8.
© SWITCH 2013 “Mainframe
business model” 8J. Hamilton, “Data Center Networks Are In My Way”, October 2010
9.
© SWITCH 2013 Possible
Approaches • Separate forwarding/packet processing logic (data plane) and control plane – OpenFlow (Kurt’s talk) • Improve onboard programmability – SDKs, better access to embedded OS • Use general-purpose hardware – E.g. Linux/Intel servers (Luke’s talk) 9
10.
© SWITCH 2013 Dumb
Fabric/Smart Edge Some SDN proponents suggest this architecture for future (DC) networks: • Use a simple fabric for bottleneck-free bw. – Could be IP, MPLS, or OpenFlow net… • Implement functionality at edge – E.g. isolation, load distribution over multipath – E.g. in the CPU-based hypervisor 10
11.
© SWITCH 2013 NFV
(Network Function Virtualization) • Telco buzzword for something natural… • “Network functions” can be run in VMs • This is already happening: – Cisco Nexus 1000V – Cisco Cloud Services Router 1000V – Juniper vGW (Virtual Gateway) firewall • Note how “hardware-based” firewalls are superseded by Xeon-based ones 11
12.
© SWITCH 2013 Industry
taking SDN seriously? • 2012-04-17: U. Hölzle gives talk @ONS about production Google OpenFlow WAN • 2012-07-23: VMware acquires Nicira for USD 1.05 billion 12
13.
© SWITCH 2013 Do
we have to take it seriously? • If you’re an SDN researcher, yes • If you’re a backbone operator… not yet(?) • If you have to do with campus networks and edge network devices (firewalls etc.): yes 13
14.
© SWITCH 2013 What
about Performance? • New approaches to fast networks: massive multipath, stupid core, edge functions on CPUs • New requirements and new opportunities for instrumentation (measurements) • New opportunities for things to go wrong, e.g. OpenFlow table-update bottlenecks 14
15.
© SWITCH 2013 Further
Reading • Gentle Introduction to SDN, S. Shenker, 2012 http://www.youtube.com/watch?v=eXsCQdshMr4 • Datacenter Networks Are In My Way, J. Hamilton, 2010 (read the slides!)http://perspectives.mvdirona.com/2010/10/31/Datacenter NetworksAreInMyWay.aspx • OpenFlow @Google, U. Hölzle, 2012 http://www.youtube.com/watch?v=VLHJUfgxEO4 • The Future of Networking, and the Past of Protocols, S. Shenker, 2011 http://www.youtube.com/watch?v=YHeyuD89n1Y http://www.slideshare.net/martin_casado/sdn-abstractions 15
16.
© SWITCH 2013 Further
Further Reading • Open Networking Summit (industry) – Each April in Silicon Valley • HotSDN workshop (research) – Each Summer wherever SIGCOMM is held • SDN MOOC by Nick Feamster (Georgia Tech.) – 6 weeks starting on 27 May https://www.coursera.org/course/sdn?goback=.gde_4359316_memb er_207551682 • Meta-list: http://www.nec-labs.com/~lume/sdn-reading-list.html 16
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