[ovs-dev] [BUG] broad-/multicast & SLB bonding -> FAIL

[Ben Pfaff]

On Wed, Jan 23, 2013 at 10:33:49AM +0100, Markus Schuster wrote:
> On Tuesday 22 January 2013 22:26:33 Ben Pfaff wrote:
> > On Tue, Jan 22, 2013 at 07:39:01PM +0100, Markus Schuster wrote:
> > > Open vSwitch sends out the multicast frames on ALL physical interfaces
> > > belonging to the SLB bond. That causes a lot of confusion on the physical
> > > switches that XCP hosts are connected to (VM MAC addresses jumping
> > > between ports multiple times a second).
> > 
> > It shouldn't be doing that.  How did you determine that this is
> > happening?
> 
> First of all a little overview of the components involved, so we're actually 
> talking about the same thing:
> http://www.picpaste.com/pics/overview-4xoHXl1v.1358932433.png
> All XCP hosts are Blades, connected to the BladeCenter internal switches 
> (Nortel L2-3 switching modules) which are connected to our switching backbone 
> (via LACP aggregated links, but shouldn't matter for this issue). 

It looks like you have each interface on an SLB bond connected to two
different switches.  That's not a supported configuration and won't work
reliably.