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[Launchpad Bug Tracker <1464116@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1464116

Title:
  'network_id' and 'cidr' should be unique int table 'Subnet'

Status in neutron:
  Expired

Bug description:
  'network_id' and 'cidr' should be unique int table 'Subnet', so unique constraints should be added!
  if we add unique constraints, it can solve the problem in bellow use case:
  1. there are two neutron-server which behind haproxy in one openstack. 
  2. two users create a subnet with 192.168.0.0/24 in one network at same, then the two requests are send apart to two neutron-server by haproxy.
  3. the two user all create subnet successfully, so in one network, it has same CIDR subnet, but it should not be allowed.

  if we add unique constraints, one user will be create subnet failed

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