Comment 3 for bug 1707381

Miguel - yes, I probably even wrote part of that document :)

I was maybe thinking of an edge case where there were no more IPs matching the service-type, but then we did document that as well:

"During IP allocation, the IPAM driver returns an address from a subnet with a service type matching the port device owner. If no subnets match, or all matching subnets lack available IP addresses, the IPAM driver attempts to use a subnet without any service types to preserve compatibility."

That covers this bug - port with one device_owner value can have an IP in a subnet with the None service-type. As long as you can't allocate an IP from a subnet of another non-None service-type this bug is probably invalid then.