Comment 0 for bug 1692490

With Neutron segments it is not possible to mix subnets with segment_id: None and subnets with a segment_id. In some cases a network will be created, a subnet added without creating a segment. tTen later this network need to scale, and dividing it onto multiple routed segments is required.

To be able to support migration from non-routed, to a routed network we would like the ability to migrate current subnets on a network with no segments to a segment. The migration can/should be limited to migrating the subnet to a segment that use the same "provider:physical_network".

This feature woulb enable possibility to upgrade/migrate existing Triplo deployments to neutron routed segments model.