Hi, I was doing another pass on this spec, to see if we could leverage it as-is for QoS / bandwidth tracking / bandwidth guarantees, and I have a question [1] I guess I'm just missing some detail, but looking at the 2nd scenario, why wouldn't availability zones allow the same exactly if we used one availability zone per subnet? What's the advantage of modelling it via a generic resource pool? Best regards, Miguel Ángel. [1] https://review.openstack.org/#/c/253187/14/specs/newton/approved/generic-resource-pools.rst