Comment 2 for bug 1944948

After just the IPv4 subnets in the reproducer there is a port with Device Owner: network:distributed which has IP addresess on both network segments.

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

> DEBUG print's
> HARALD - _query_filter_by_fixed_ips_segment allow_multiple_segments: True
> HARALD - _query_filter_by_fixed_ips_segment fixed_ips: [{'subnet_id': '24bbf7fe-482b-455a-a24f-3f3445af5759'}]

openstack subnet create --network test_net --network-segment segment778 --ip-version 4 --subnet-range 10.77.8.0/24 --dhcp segment778-v4

> DEBUG print's
> HARALD - _query_filter_by_fixed_ips_segment allow_multiple_segments: True
> HARALD - _query_filter_by_fixed_ips_segment fixed_ips: [{'subnet_id': 'b2c2a935-8a85-44b2-8a0a-2e0533ad8d56'}, {'subnet_id': '24bbf7fe-482b-455a-a24f-3f3445af5759', 'ip_address': '10.77.7.2'}]

stack@heat-devstack:~$ openstack port list --long --network test_net -f yaml
/usr/lib/python3/dist-packages/secretstorage/dhcrypto.py:15: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
  from cryptography.utils import int_from_bytes
/usr/lib/python3/dist-packages/secretstorage/util.py:19: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
  from cryptography.utils import int_from_bytes
- Device Owner: network:distributed
  Fixed IP Addresses:
  - ip_address: 10.77.7.2
    subnet_id: 4bab13e3-bef0-45d6-8c73-491c2e0cf183
  - ip_address: 10.77.8.2
    subnet_id: 82cd4ea5-fed6-4668-b373-f7d873f3d31c
  ID: 8e1c95f9-38b0-44c9-8249-dc9d0766fb01
  MAC Address: fa:16:3e:49:97:80
  Name: ''
  Security Groups: null
  Status: DOWN
  Tags: []

Updating this port with another address when adding the IPv6 subnet is failing.

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

> DEBUG print's
> HARALD - _query_filter_by_fixed_ips_segment allow_multiple_segments: False
> HARALD - _query_filter_by_fixed_ips_segment fixed_ips: [{'subnet_id': '24bbf7fe-482b-455a-a24f-3f3445af5759', 'ip_address': '10.77.7.2'}, {'subnet_id': 'b2c2a935-8a85-44b2-8a0a-2e0533ad8d56', 'ip_address': '10.77.8.2'}]

The difference seems to be that in the IPv4 subnet create case the 'allow_multiple_segments' is True, while in the IPv6 case it is False.

In patch "[OVN] Allow IP allocation with different segments for OVN service ports"[1] the flag "distributed_service" was added.

I believe the problem here is that the flag "distributed_service" is not set in the IPv6 case?

[1] https://opendev.org/openstack/neutron/commit/8d1512afb07a9a77958c44f2e7f5d47865c8a475