Comment 1 for bug 1529926

This error was found during Rally test:
   NeutronNetworks.create_and_list_routers:
     -
       args:
         network_create_args:
         subnet_create_args:
         subnet_cidr_start: "1.1.0.0/30"
         subnets_per_network: 2
         router_create_args:
       runner:
         type: "constant"
         times: {{smoke or 15}}
         concurrency: {{smoke or 5}}
       context:
         network: {}
         users:
           tenants: {{smoke or 3}}
           users_per_tenant: {{smoke or 2}}
         quotas:
           neutron:
              network: -1
              subnet: -1
              router: -1
       sla:
         failure_rate:
           max: 20

In this test rally constantly create routers 15 times.
Setup of this test involved 3 OpenStack controllers, on each Neutron server was configured with Neutron NSX plugin.
HAproxy on controllers was configured in active/passive mode.