Sometimes we can not say a cloud deployment has unlimited capacity, especially for small cluster. And sometimes, cluster expansion takes time. You can not adjust all users/project quota at once. Then users began to complain, why I cannot create resource since I still have free quota? Why you change my quota?
Furthermore, a cloud deployment may not have much ability to handle unlimited resource since the total physical capacity has its ceiling. For instance, there is no more free capacity of your storage cluster to create more volumes. There are no more bandwidth for your network cluster to hold more floating IPs. There are no more vCPUs of compute node to hold more instances.
This RFE propose to add some limitation of neutron to avoid user creating resource beyond the cluster capacity. So, then cloud users(providers) can estimate a total capacity limit based on the cluster size and limit it directly at the initial deployment.
"This RFE propose to add some limitation of neutron to avoid user creating resource beyond the cluster capacity". How do you express those limits? maximum number of ports? maximum number of networks? How is this going to play with other openstack projects, Nova for example?