I'm struggling with what I though to be a relatively standard deployment model for CP. Setting up test environments for developers

Essentially I want to set up 5 isolated environments with 20 VMs in each. Each isolated environment should have the same CIDR, isolated by VLAN.

Before I begin, I have CloudPlatform functioning nicely and have already deployed a Shared network with a number of VMs all behaving as expected.

The method I have used to create my isolated networks is as follows:

1. Create new network offering as follows:
- Name = IsolatedIntegrationEnvironment
- Guest type = Isolated
- Availability = Optional
- Specify VLAN = No
- Network rate = 200Mb/s
- Traffic Type = Guest
- Supported services = SourceNat, DHCP, UserData, Firewall

2. Create first isolated network:
- Type = Isolated
- VLAN ID = 11 (automatically assigned from VLAN range)
- Network Offering = IsolatedIntegrationEnvironment
- Gateway = xxx.xxx.xxx.254
- Netmask = 255.255.255.0

All works as expected, VMs successfully deployed across server pool

3. Create second isolated network... the same as step 2, however when i do this I get the following error:
"Found existing network configuration (with specified id) for offering (with specified id)"

Now I know that one of the primary capabilities of CloudPlatform is the ability to isolate networks by VLAN, so clearly I must be doing something wrong.

Any advice greatly appreciated.

Platform: Xenserver 6.1; CloudPlatform 3.0.6

Regards

Andy