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). How did we determine this is happening: First we had a look in the switching table on Backbone Switch 1, seeing that the MAC address of the VM in question running on the XCP Blade jumps between the uplink ports to BC switch 1 and BC switch 2 like crazy. Next, we configured port mirroring on BC switches 1 & 2 to see all traffic of the BladeCenter internal port that connects the XCP Blade to the BC internal switches. We dumped traffic with tcpdump and had a look with Wireshark afterwards. What we saw was the exact same frames carrying the IP multicast packets on both BC switches at the very same time. Next, we connected directly to the XCP Blade, started tcpdump on the two physical interfaces forming the SLB bond and filtering for broad-/multicast traffic and the MAC of the VM in question. Again, we saw broad- and multicast traffic going out on both interfaces. That's the story, hope that helps you somehow. Regards, Markus _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
