Open Stack

Hi everyone. I have a problem when I build environment with multi neutron
server:

This is topology: http://codepad.org/ff0debPB

After I built topology. I can create subnets on only one network that
duplicated CIDR. AT SAME TIMMING.

How to reproduce:

Step 1: Create a network
$ neutron net-create test-net

Step 2: Create multiple subnets that duplicated CIDR scope
Please running commands AT SAME TIMMING
 - On controller1:
$ neutron subnet-create --name test-subnet1 test-net 192.168.100.0/24
 - On controller2:
$ neutron subnet-create --name test-subnet2 test-net 192.168.100.0/24

After check subnet-list:

Running command: $ neutron subnet-list
This is the result: http://codepad.org/306Vi90d

Running command: $ neutron net-list
This is the result: http://codepad.org/AcYRLP4b

After check database:
This is the result: http://codepad.org/4qRC229P


I think. In originally, one command on controller will be fail and we catch
a message as following: "Invalid input for operation: Requested subnet with
cidr: 192.168.100.0/24 for network: 39cc0850-1eeb-4c85-bcdc-338a3f1461aa
overlaps with another subnet.". But currently, two commands are success

Do you have suggest how to solve this problem ?

Thank you for your time..
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