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[OpenStack Infra <1692490@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/523972
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=b6d117fcd577f50a431113c4ad13258a7692e822
Submitter: Zuul
Branch:    master

commit b6d117fcd577f50a431113c4ad13258a7692e822
Author: Harald Jensas <hjensas@xxxxxxxxxx>
Date:   Mon Nov 27 20:57:25 2017 +0100

    Allow setting network-segment on subnet update
    
    To enable the possibility to migrate a non-routed network to a
    routed network allow updating the segment_id of a subnet.
    
    Only allow the operation if:
     - The network only has one segment
     - The network only has one subnet
     - The current segment_id == None
    
    APIImpact: The segment_id attribute of subnets now allows put operation.
    Closes-Bug: #1692490
    Depends-On: Iffda823a149a1143f46ee9a05e9640b34bf42c51
    Change-Id: I1aee29dfb59e9769ec0f1cb1f5d2933bc5dc0dc5


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1692490

Title:
  [RFE] Ability to migrate a non-Segment subnet to a Segment

Status in neutron:
  Fix Released

Bug description:
  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.
  Then 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 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 would enable possibility to upgrade/migrate existing
  Triplo deployments to neutron routed segments model.

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