Current controllers (e.g., Beacon) can handle millions of packet-ins/flowmods per second, the bottleneck is in the switches, which can handle hundreds to thousand or so packet-ins/flowmods per second. So depending on the network scenario switches may not cope with the bursts of packet-ins/flowmods.
2013/9/24 Ming-Chen Zhao <mingchen.z...@gmail.com> > Thanks for your reply. It is very helpful! > > > On Tue, Sep 24, 2013 at 5:53 PM, Wes Felter <w...@felter.org> wrote: > >> On 9/24/13 3:26 PM, Ming-Chen Zhao wrote: >> >> From these old research papers, I can see the flow setup rate they can >>> achieve is about 200-300 flows/sec. The bottleneck is the bandwidth >>> between controller and openflow switches. >>> >> >> We saw more like 1,000 flows/s on the G8264, so things have improved a >> little. >> >> >> However, there are no reports >>> from industrial to discuss what the real flow setup rate they need... >>> Can 200-300 flows/sec be enough to support a small datacenter network? >>> >> >> One way to begin to answer this question might be to consider STP or OSPF >> convergence time and compare it against OpenFlow. In some cases RSTP can >> converge in less than one second, but OpenFlow convergence time is >> proportional to the number of flows; at L2 the number of flows is at least >> the number of hosts. So an L2 OpenFlow network will converge slower than >> RSTP if it has a significant number of hosts. >> In an L3 network the number of flows might be equal to the number of >> subnets, so a small number of updates per second might be acceptable. >> >> >> -- >> Wes Felter >> IBM Research - Austin >> >> ______________________________**_________________ >> openflow-discuss mailing list >> openflow-discuss@lists.**stanford.edu<openflow-discuss@lists.stanford.edu> >> https://mailman.stanford.edu/**mailman/listinfo/openflow-**discuss<https://mailman.stanford.edu/mailman/listinfo/openflow-discuss> >> > > > > -- > Mingchen Zhao > Ph.D. Candidate, Computer and Information Science Program (CIS) > School of Engineering and Applied Science (SEAS) > E-mail: miz...@seas.upenn.edu > > _______________________________________________ > openflow-discuss mailing list > openflow-discuss@lists.stanford.edu > https://mailman.stanford.edu/mailman/listinfo/openflow-discuss > > -- Marcos Rogério Salvador, Ph.D. Network Technology Evolution Manager CPqD - Center for Research and Development in Telecommunications Tel +55 19 3705-4562 E-mail: marco...@cpqd.com.br Skype: mr-salvador URL: www.cpqd.com.br
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