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[John Perkins <john.perkins@xxxxxxxxxxxxx>]

** Changed in: neutron
   Importance: Undecided => Wishlist

** Changed in: neutron
       Status: New => Opinion

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https://bugs.launchpad.net/bugs/1600691

Title:
  Should not create overlapped subnetpool in one tenant

Status in neutron:
  Opinion

Bug description:
  After adding address scope in Mitaka, the openstack can create
  subnetpool with specified address scope, and in the same address
  scope, we can not create the overlapping subnetpool.

  As we also known, the BGP depends on these two features to get the
  advertised tenant networks. So in order to get better subnet
  management, we'd better create subnet from the subnetpool and add the
  address scope.

  In order to backward compatibilities, the subnetpool can be created
  without address scope, see below, the address_scope_id is empty.

  yangyubj@yang-devstack-ubuntu-1604:/opt/stack/logs$ neutron subnetpool-show 07f8a928-afb3-4ba8-ba46-cb70c6d9c073
  +-------------------+--------------------------------------+
  | Field             | Value                                |
  +-------------------+--------------------------------------+
  | address_scope_id  |                                      |
  | created_at        | 2016-06-01T09:32:52                  |
  | default_prefixlen | 24                                   |
  | default_quota     |                                      |
  | description       |                                      |
  | id                | 07f8a928-afb3-4ba8-ba46-cb70c6d9c073 |
  | ip_version        | 4                                    |
  | is_default        | True                                 |
  | max_prefixlen     | 32                                   |
  | min_prefixlen     | 8                                    |
  | name              | shared-default-subnetpool            |
  | prefixes          | 10.0.0.0/8                           |
  | shared            | True                                 |
  | tenant_id         | 21734c4383284cf9906b7fe8246bffb1     |
  | updated_at        | 2016-06-01T09:32:52                  |
  +-------------------+--------------------------------------+

  And the user can be continuous to create overlapping subnetpool with
  the empty address scope id. If the address scope id is specified, the
  customer can not create the overlapping subnetpool.

  So IMO, for the best practice, we can not allow the user to create
  overlapping subnetpool when the address scope id is empty.

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