Hi, Thanks for the detailed explanation, it was a great help.
2011/3/16 Kyriakos Zarifis <[email protected]> > Hi Paulo, > > tou could definitely have multiple NOX instances running, and if a switch > loses connection to one it can connect to the other, if configured to do so. > However, network disruption depends on whether the state in the two > controllers (or the components running in the 2 controllers) needs to be > identical. NOX does not inherently support such kind of replication/state > distribution at the moment. > > As a simple example: if you are running something like the learning switch > component, the disruption would not be critical as, in the worst case, the > backup controller would need to recreate the state for its switch component > (by initially flooding packets). So this wouldn't even necesarrily require > any coordination between the controllers. > There can be other cases however where the state in the backup controller > would need to be synched with that in the primary at all times. > > > On Wed, Mar 16, 2011 at 1:28 PM, Paulo César <[email protected]> wrote: > >> Hi, >> >> thanks for the reply. >> >> This secondary controller must be kept consistent with the primary (same >> context and applications) to prevent perfomace loss? >> >> Regards. >> >> >> 2011/3/16 Aaron Rosen <[email protected]> >> >>> Hi Paulo, >>> >>> When you configure your openflow switch there are usually options to >>> configure it with a secondary controller in case your primary >>> controller dies. >>> >>> Aaron >>> >>> On Wed, Mar 16, 2011 at 3:23 PM, Paulo César <[email protected]> wrote: >>> > Hi, >>> > the paper "NOX: Towards an Operating System for Networks", says that >>> > centralized paradigm raises the specter of a single point of failure, >>> but >>> > can >>> > achieve adequate resilience applying standard replication techniques. >>> > I would like to know if there is some way (currently available or in >>> > development) to replicate NOX in case of NOX failure? >>> > Best regards. >>> > >>> > -- >>> > "Life is not fair; get used to it." >>> > Bill Gates >>> > >>> > >>> > _______________________________________________ >>> > nox-dev mailing list >>> > [email protected] >>> > http://noxrepo.org/mailman/listinfo/nox-dev >>> > >>> > >>> >>> >>> >>> -- >>> Aaron O. Rosen >>> Masters Student - Network Communication >>> 306B Fluor Daniel >>> 843.425.9777 >>> >> >> >> >> -- >> "Life is not fair; get used to it." >> Bill Gates >> >> >> _______________________________________________ >> nox-dev mailing list >> [email protected] >> http://noxrepo.org/mailman/listinfo/nox-dev >> >> > -- "Life is not fair; get used to it." Bill Gates
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