[Openstack] periodic packet loss in openvswitch

Don Waterloo don.waterloo at gmail.com
Wed Oct 15 03:25:51 UTC 2014

On 14 October 2014 22:45, Don Waterloo <don.waterloo at gmail.com> wrote:

> 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.
> I am also (and certainly related) getting this problem:
IPv4: martian source from, on dev br-ex
ll header: 00000000: ff ff ff ff ff ff fa 16 3e e7 97 7a 08 06

on the compute nodes running neutron ovs agent.

if i hunt down the mac address in my port-list, it is my 'ext-net', the
network that is used to reach my physical network. its created as:

neutron net-create  --shared --router:external=True ext-net
neutron subnet-create  --name ext-subnet \
    --host-route destination=$CONTROL_IP/32,nexthop=$DATA_IP \
    --dns-nameserver $DATA_IP \
    --disable-dhcp \
    ext-net $BR_EX_IP

so i have to believe this is related.

the blade complaining about this is 247.5, and all of the others (247.4,
247.3 etc) are present in the log.

so if i read this correctly, a broadcast from my 'ext-net' port is arriving
with the src-ip/dest-ip filled in

src-mac: ext-net
dst-mac: all 1 broadcast
src-ip: slot X
dst-ip: slot 4

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