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[OpenStack Infra <1944948@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/811719
Committed: https://opendev.org/openstack/neutron/commit/84b6db3b0528a39450f48297d289cd9c618e3beb
Submitter: "Zuul (22348)"
Branch:    master

commit 84b6db3b0528a39450f48297d289cd9c618e3beb
Author: Harald Jensås <hjensas@xxxxxxxxxx>
Date:   Wed Sep 29 13:26:36 2021 +0200

    [OVN] Allow IP allocation with different segments for OVN service ports
    
    Allow IP allocation with different segments also for IPv6
    auto allocation for OVN service ports.
    
    See change: Ib51cde89ed873f48db4daebc27a0980da9cc0f19
    
    Change-Id: Ic6db2f66be596756b1fed9ffeffc7b049f6e957f
    Closes-Bug: #1944948


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

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https://bugs.launchpad.net/bugs/1944948

Title:
  IPv6 slaac subnet creation causes FixedIpsSubnetsNotOnSameSegment
  error

Status in neutron:
  Fix Released

Bug description:
  When trying to create IPv6 SLAAC subnet in multisegment network
  Neutron raises the FixedIpsSubnetsNotOnSameSegment error. But the
  subnet is actually created.

  Steps to reproduce:
  $ openstack network create --share --provider-network-type geneve --provider-segment 777 test_net
  SEGMENT=`openstack network segment list --network test_net | awk '/777/ {print $2}'`
  $ openstack network segment set --name segment777 $SEGMENT
  $ openstack network segment create --network-type geneve --segment 778 --network test_net segment778
  $ openstack subnet create --network test_net --network-segment segment777 --ip-version 4 --subnet-range 10.77.7.0/24 --dhcp segment777-v4
  $ openstack subnet create --network test_net --network-segment segment778 --ip-version 4 --subnet-range 10.77.8.0/24 --dhcp segment778-v4
  $ openstack subnet create --network test_net --network-segment segment777 --ip-version 6 --subnet-range 2001:10:77:7::/64 --dhcp --ipv6-address-mode slaac segment777-v6

  Expected result:
  Subnet created with no errors

  Actual result:
  Subnet created, but API throws an exception:
  BadRequestException: 400: Client Error for url: http://10.0.0.105:9696/v2.0/subnets, Cannot allocate addresses from different segments.

  Version:
  - Devstack (Neutron master)
  - OVN 21.03

  There's a Bugzilla about this topic [0]

  [0] https://bugzilla.redhat.com/show_bug.cgi?id=1939601

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