[Openstack] periodic packet loss in openvswitch

Don Waterloo don.waterloo at gmail.com
Wed Oct 15 02:45:25 UTC 2014

I  have a system w/ 6 blades interconnected on L2. 1 controller, 5
compute/network nodes.
they are using icehouse, neutron, ovs, with vxlan on ubuntu 14.04.

Once in a while, one of the compute blades will declare a bunch of lines
like this:

129749.691102] qbrfc96cb3f-f3: received packet on qvbfc96cb3f-f3 with own
address as source address
[129749.691112] qbrcdd85970-14: received packet on qvbcdd85970-14 with own
address as source address
[129749.691471] qbr8e0cc5fd-17: received packet on qvb8e0cc5fd-17 with own
address as source address
[129749.691620] qbr270b38d8-4d: received packet on qvb270b38d8-4d with own
address as source address

in its dmesg, and during that time (1-2 seconds usually), packets cease to
be forwarded from the controller (the l3 agent).

what could be causing this packet storm? of 'own address' packets? any
suggestions on how to debug? there's a lot of traffic flying around, so
packet captures need to be tactical.

if i do a tcpdump for its src address, eg.
tcpdump -i qvbcdd85970-14 ether src f2:4b:2d:1f:e0:9b
i'm not seeing it.
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