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[Brian Haley <1896592@xxxxxxxxxxxxxxxxxx>]

This is actually a bug in the Tempest repo, we changed the code in
neutron-tempest-plugin to be better at creating unique subnets in
https://review.opendev.org/#/c/560465/

Wondering if we need to have a similar change in Tempest.

Should we change the component or just add it as affected?  Although it
is affecting the neutron gate it seems.

** Also affects: tempest
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1896592

Title:
  [neutron-tempest-plugin] test_dhcpv6_stateless_* clashing when
  creating a IPv6 subnet

Status in neutron:
  New
Status in tempest:
  New

Bug description:
  The following three test cases are clashing when creating, at the same time, an IPv6 subnet with the same CIDR:
  - test_dhcpv6_stateless_eui64
  - test_dhcpv6_stateless_no_ra
  - test_dhcpv6_stateless_no_ra_no_dhcp

  Log: https://61069af11b09b96273ad-
  d5a2c2135ef34e5fcff72992ca5eb476.ssl.cf2.rackcdn.com/662869/6/check
  /neutron-tempest-with-uwsgi/9b9c086/controller/logs/tempest_log.txt

  Snippet: http://paste.openstack.org/show/798195/

  Error:
  "Invalid input for operation: Requested subnet with cidr: 2001:db8::/64 for network: 31e04aec-34df-49dc-8a05-05813a37be98 overlaps with another subnet."

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