Comment 43 for bug 1290486

Sorry for a long reply, wasn't subscribed for the notifications and missed you comments :(

So I've double-checked I'm running the neutron master. This doesn't seem to be an L3-agent issue. I'm running Neutron master as of commit 24718e6f1764e95f0c393ba042546e3584981b31 (Ubuntu 14.04, 3.13.0-29-generic, OVS 2.0.1+git20140120-0ubuntu2).

Steps to reproduce:

1. Run tripleo devtest story. This will give you a 3 node cluster - 1 controller node + 2 compute nodes. Neutron ML2 plugin is used, OVS agents are run on each node.
2. SSH to a controller node.
3. Start pinging the VM using its private IP address from a DHCP agent namespace.
4. SSH to a compute node running the VM.
5. Restart the OVS.
6. The ping stops working until neutron-openvswitch-agent is restarted on the compute node.

Right after OVS restart I see this in neutron-openvswitch-agent log: http://paste.openstack.org/show/84472/
The complete log is here http://paste.openstack.org/show/84473/ (there are some errors, but I'm not sure they are related to this problem, 'WAS HERE' is a string I log to ensure the code of your fix is executed)