Comment 1 for bug 1223360

I think you are talking about the provider network feature in Neutron.

At now network creation form does not support provider network feature in Neutron. The blueprint is proposed to allow admin to specify the segmentation ID, but I don't see any progress.

The segmentation ID depends on the network type of the network, so it is not simple to validate user input. If we can pass the parameters to Neutron without any cross-field validation, it can be implemented. However, it is not user-friendly.

I would like to know your thought on in for better implementation.
If it is small, we can consider a fix in Havana-RC1.