[ovs-discuss] OVS Multiple GRE tunnels

[Ahmed Talha Khan]

Thanks for the swift reply Jesse.



On Tue, Dec 11, 2012 at 10:04 PM, Jesse Gross <jesse at nicira.com> wrote:

> On Mon, Dec 10, 2012 at 10:49 PM, Ahmed Talha Khan <auny87 at gmail.com>
> wrote:
> > Hey,
> >
> > I have a few questions regarding the support of GRE tunnels in OVS.
> >
> > 1. I create a tunnel endpoint on an ovs-port with the gre options as
> defined
> > in the manpages. Now i want to send mod-flow msgs from the controller
> which
> > contain only the output action on that port. Will ovs append the
> transport
> > tunnel header on it by itself even when i hve not specified the
> set-tunnel
> > action?.
>
> Yes.
>
> > 2. Is the tunneling support in question one, extensible in anyway? What
> if i
> > want to add some extra headers or modify the tunnel headers?
>
> Adding extra headers requires dataplane code changes.  It's possible
> that you could modify existing headers by processing the packet again
> after tunnel output but before the network device.
>
> > 3. A tunnel endpoint is logically bounded to a physical interface which
> > means that ovs will make that port a TEP as viewed by the hypervisor.
> Can i
> > make multiple tunnels from the same TEP destined to multiple destination
> > TEPs? Effectively meaning can i have multiple tunnels originating from
> the
> > same port that i made in part 1?
>
> Yes.
>
> > 4. What is the best possible way to create such tunnel between OVS and
> VMs.
> > This is different from part 3 above as VMs will not have physical NICs.
> It
> > more of a logical tunnel then actual tunnel between 2 physical hosts
>
> You just need to bridge the VM to a tunnel.
>



-- 
Regards,
-Ahmed Talha Khan
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