[ovs-discuss] Multiple OVSs or multiple datapaths with one OVS

[Aishwarya]

I am using the master branch which is OVS 1.10 or higher. So does that mean
I will not be able to test multiple datapaths with a single ovs-vswitchd
daemon with 1.10 and higher? You answered yes to #2 above? Is this true
with 1.10 too?

Thanks.


On Fri, Apr 12, 2013 at 2:43 PM, Ben Pfaff <blp at nicira.com> wrote:

> On Fri, Apr 12, 2013 at 02:27:09PM -0700, Aishwarya wrote:
> > 1) Running 2 OVS user space daemons on the same machine, and creating a
> > bridge per OVS process.
> >
> > 2) Running a single OVS and creating 2 different bridges with the same
> OVS
> > process.
> >
> > Couple of questions:
> > 1. Is (1) even supported?
>
> It won't work, out of the box, if you use the OVS kernel module.  You
> might be able to get it to work with some effort, especially if you
> use the userspace datapath only.
>
> > 2. My use case is that I basically want to be able to test with multiple
> > datapaths on the same machine. With my experimentation, I feel (2) should
> > satisfy this. Is that true?
>
> Yes.
>
> > 3. Does a single bridge correspond to a single datapath? If not, what is
> > the real difference between the concept of a bridge and datapath?
>
> A bridge is an Ethernet or OpenFlow concept.  A datapath is an
> implementation detail.  Before OVS 1.10 there was a one-to-one
> relationship between bridges and datapaths; in OVS 1.10 and later
> there is only one datapath even if there are many bridges.
>
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