hi Carlos,
On Oct 21, 2013, at 8:34 AM, Carlos Ferreira <carlosmf...@gmail.com> wrote:
> I don't really understand why would anyone want multiple controllers, when
> there could be only one controller and over it, multiple apps implementing
> different services. Its a much more simple layered approach.
multiple controllers are important for the same reasons one would want multiple
instances of any piece of critical infrastructure: scalability, redundancy,
fault-tolerance, the ability to upgrade without impacting the running network,
to protect yourself from software bugs or operational mistakes, to completely
isolate different domains except via an intern-domain protocol (eg, BGP), etc.
of course, this makes the controller a distributed system, so now you have two
problems. :-)
cheers,
Andrew
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