Seen a few more failures:-
 -   https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_a63/886231/1/check/neutron-ovn-tempest-ipv6-only-ovs-release/a63687d/testr_results.html
 -  https://a3e174dd787d1569c081-614f3af0609b64225912d2a4919c81df.ssl.cf5.rackcdn.com/882581/7/check/neutron-ovn-tempest-ipv6-only-ovs-release/feb8b96/testr_results.html


$ grep admin_state_up screen-q-svc.txt |grep "'admin_state_up': True"|grep "Request body: {'router'"
Jun 16 16:28:00.617751 np0034320529 neutron-server[57489]: DEBUG neutron.api.v2.base [None req-2a66e63a-6f5e-4abd-9326-87edec5262f5 demo demo] Request body: {'router': {'admin_state_up': True, 'name': 'router1'}} {{(pid=57489) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}
Jun 16 16:56:24.073625 np0034320529 neutron-server[57489]: DEBUG neutron.api.v2.base [None req-68e7d391-f799-42d6-a156-91566ee8a7d2 tempest-NetworksTestDHCPv6-1147368735 tempest-NetworksTestDHCPv6-1147368735-project-member] Request body: {'router': {'name': 'tempest-NetworksTestDHCPv6-router-863088563', 'external_gateway_info': {}, 'admin_state_up': True}} {{(pid=57489) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}
Jun 16 16:56:29.565406 np0034320529 neutron-server[57489]: DEBUG neutron.api.v2.base [None req-69ecb9e9-adad-4bab-9d88-4d6a8ec93e16 tempest-NetworksTestDHCPv6-1147368735 tempest-NetworksTestDHCPv6-1147368735-project-member] Request body: {'router': {'name': 'tempest-NetworksTestDHCPv6-router-2081586294', 'external_gateway_info': {}, 'admin_state_up': True}} {{(pid=57489) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}
Jun 16 16:58:48.759733 np0034320529 neutron-server[57489]: DEBUG neutron.api.v2.base [None req-e53ee47d-05b5-44d3-ae03-cd5c743e7c2a tempest-TestNetworkBasicOps-1899229111 tempest-TestNetworkBasicOps-1899229111-project-member] Request body: {'router': {'name': 'tempest-TestNetworkBasicOps-router-1236277632', 'admin_state_up': True, 'project_id': 'ffcabcbafb6248378ecf851ad0c4a820', 'external_gateway_info': {'network_id': '738da43f-f3f1-44eb-96b9-c00cba3b25bb'}}} {{(pid=57489) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}
Jun 16 17:03:08.332661 np0034320529 neutron-server[57489]: DEBUG neutron.api.v2.base [None req-602e429e-3d8a-4a4e-a29c-6dbba2a9e2ba tempest-TestNetworkBasicOps-1899229111 tempest-TestNetworkBasicOps-1899229111-project-member] Request body: {'router': {'name': 'tempest-TestNetworkBasicOps-router-742545444', 'admin_state_up': True, 'project_id': 'ffcabcbafb6248378ecf851ad0c4a820', 'external_gateway_info': {'network_id': '738da43f-f3f1-44eb-96b9-c00cba3b25bb'}}} {{(pid=57489) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}
Jun 16 17:05:31.764891 np0034320529 neutron-server[57490]: DEBUG neutron.api.v2.base [None req-43142176-2858-4515-8ed7-a4d2c97a934a tempest-TestSecurityGroupsBasicOps-146927725 tempest-TestSecurityGroupsBasicOps-146927725-project-member] Request body: {'router': {'name': 'tempest-TestSecurityGroupsBasicOps-router-162865443', 'admin_state_up': True, 'project_id': '9db58a07a2a14a5f82b6894431dae303', 'external_gateway_info': {'network_id': '738da43f-f3f1-44eb-96b9-c00cba3b25bb'}}} {{(pid=57490) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}
Jun 16 17:06:38.145410 np0034320529 neutron-server[57490]: DEBUG neutron.api.v2.base [None req-59dd9e6e-c2e6-46f5-b079-aacc92621cdd tempest-TestSecurityGroupsBasicOps-951623755 tempest-TestSecurityGroupsBasicOps-951623755-project-member] Request body: {'router': {'name': 'tempest-TestSecurityGroupsBasicOps-router-1380610968', 'admin_state_up': True, 'project_id': '0021dae7097e4c2c9ea837bef4dfb542', 'external_gateway_info': {'network_id': '738da43f-f3f1-44eb-96b9-c00cba3b25bb'}}} {{(pid=57490) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}
Jun 16 17:08:04.387898 np0034320529 neutron-server[57489]: DEBUG neutron.api.v2.base [None req-5fef2ce1-6dbb-484a-bfde-14cc65378e94 tempest-TestSecurityGroupsBasicOps-146927725 tempest-TestSecurityGroupsBasicOps-146927725-project-member] Request body: {'router': {'name': 'tempest-TestSecurityGroupsBasicOps-router-605452233', 'admin_state_up': True, 'project_id': '9db58a07a2a14a5f82b6894431dae303', 'external_gateway_info': {'network_id': '738da43f-f3f1-44eb-96b9-c00cba3b25bb'}}} {{(pid=57489) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:731}}

Just before failing test routers are created/deleted for test test_dhcp_stateful_router[1], skipping it like other tests should help here

[1] https://opendev.org/openstack/tempest/src/branch/master/tempest/api/network/test_dhcp_ipv6.py#L405-L418