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 > >
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