Why is this a bug? Please, give more information

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

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

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https://bugs.launchpad.net/bugs/1420700

Title:
  Neutron is accepting same cidr for different subnet creations

Status in OpenStack Neutron (virtual network service):
  Opinion
Status in OpenStack Security Advisories:
  Won't Fix

Bug description:
  The following are the subnets that i have already exists in my setup.

  
+--------------------------------------+-------------------+------------------+------------------------------------------------------+
  | id                                   | name              | cidr             
| allocation_pools                                     |
  
+--------------------------------------+-------------------+------------------+------------------------------------------------------+
  | 007ac6ad-7f9a-4f1d-954e-7a0db1db8bef | oldsubnetpricate  | 10.0.0.0/24      
| {"start": "10.0.0.2", "end": "10.0.0.254"}           |
  | 84b8435f-3a95-43ef-abd8-de10b3456f43 | oldsubnetprivate  | 11.0.0.0/24      
| {"start": "11.0.0.2", "end": "11.0.0.254"}           |
  | c584e25a-d2b4-4d48-ada4-7baeaa4788ff | newsubnetpricate  | 12.0.0.0/24      
| {"start": "12.0.0.2", "end": "12.0.0.254"}           |
  
+--------------------------------------+-------------------+------------------+------------------------------------------------------+

  Here again i am trying to create a new subnet with same
  cidr(11.0.0.0/24)

  $ neutron net-create dummy

  $ neutron subnet-create dummy --name newsubnetprivate 11.0.0.0/24
  
+--------------------------------------+-------------------+------------------+------------------------------------------------------+
  | id                                   | name              | cidr             
| allocation_pools                                     |
  
+--------------------------------------+-------------------+------------------+------------------------------------------------------+
  | 007ac6ad-7f9a-4f1d-954e-7a0db1db8bef | oldsubnetpricate  | 10.0.0.0/24      
| {"start": "10.0.0.2", "end": "10.0.0.254"}           |
  | 84b8435f-3a95-43ef-abd8-de10b3456f43 | oldsubnetprivate  | 11.0.0.0/24      
| {"start": "11.0.0.2", "end": "11.0.0.254"}           |
  | 9319e880-2f9e-4493-88c9-8c81886ca4b3 | newsunetprivate   | 11.0.0.0/24      
| {"start": "11.0.0.2", "end": "11.0.0.254"}           |
  | c584e25a-d2b4-4d48-ada4-7baeaa4788ff | newsubnetpricate  | 12.0.0.0/24      
| {"start": "12.0.0.2", "end": "12.0.0.254"}           |
  
+--------------------------------------+-------------------+------------------+------------------------------------------------------+

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