The machine running NOX does not need to be *directly* connected to the
switches; it just needs to be able to reach them. So you could build a
separate control network out of standard L2 switches or routers or whatever
which allows all OpenFlow switches to be accessed from a single port.
Alternately, you can do what you suggest where NOX directly connects to one or
more OpenFlow switches and then communicates with other OpenFlow switches
through those ("in-band control").
As for how many switches NOX can support... I don't think there's an easy
answer here. I think this will vary hugely depending on exactly what your
control program and network are doing.
-- Murphy
On Jan 4, 2012, at 4:41 AM, 陈阳 wrote:
> Hi,
> I have read some papers about OpenFlow and NOX like 'NOX:Towards an
> Operationg System for Networks'. As the papers presented that each switch is
> connected to NOX.I wonder what if NOX only has a few network interface but
> there are many OpenFlow switches? How can it connect to all the switches?Or
> that the controller like NOX only connects to a few switches directly and
> the other swiches are connected to them? And I also want to know how many
> switched that NOX can support?
>
> Chenyang
>
>
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