[ovs-discuss] Some basic questions about ovs

[Ben Pfaff]

On Sat, Sep 24, 2011 at 11:36:38AM -0700, danderson415 wrote:
> 1. ovs-vswitchd is the ovs daemon, ovs-openflowd is a simplified ovs daemon
> without special features provided by ovs-vswitchd. Do both of them have
> built-in L2 switching function? The reason I asked this question is two VMs
> connected to ovs can ping each other without connecting ovs to a controller.

Yes, both have L2 switching, but the switching in ovs-vswitchd is more
sophisticated.

> 2. After I connected ovs to nox without any module running, VMs can not ping
> each other. If I run nox with pyswitch module, VMs can ping each other
> again. I dump flows using ovs-ofctl, stop nox, manually add flows using
> ovs-ofctl to ovs, ping does not work. Why is that? Does nox do anything
> besides installing flows?

Presumably the flows that you added with ovs-ofctl don't do what you
want.