Comment 2 for bug 1488279

A similar problem occurred to me a couple of weeks ago (Also REST, SSH is unknown). I think, the problem is not in network deltas computation itself. The problem is in the AmphoraePostNetworkPlug task. The AmphoraePostNetworkPlug tries to perform a post plug configuration to add a new interface that is not actually added during the compute network deltas procedure, which causes this error (there is no down interface added by neutron).

I am not sure if this is problem equally true to SSH and REST drivers. However, I fixed this by changing the AmphoraePostNetworkPlug part as shown in line 165 of:

https://review.openstack.org/#/c/206252/17/octavia/controller/worker/tasks/amphora_driver_tasks.py