Hi Zhidong,

Thanks for pointers.

IMHO, we need to have a flexibility to attach/select a Subnet for Networks and 
as well support for L2/L3 mode selection.

Certainly this will extend the Neutron use cases for ex: NFV deployments etc.

Any comments?

Regards,
Balaji.P

From: Zhidong Yu [mailto:[email protected]]
Sent: Friday, August 16, 2013 6:43 AM
To: OpenStack Development Mailing List
Subject: Re: [openstack-dev] [neutron] Why is "network" and "subnet" modeled 
separately?

I asked the similar question before. Salvatore Orlando's answer makes sense to 
me. Please refer to https://lists.launchpad.net/openstack/msg21928.html

On Thu, Aug 15, 2013 at 2:58 PM, Stephen Gran 
<[email protected]<mailto:[email protected]>> wrote:
Hi,


On 14/08/13 21:12, Lorin Hochstein wrote:
Here's a neutron implementation question: why does neutron model
"network" and "subnet" as separate entities?

Or, to ask another way, are there are any practical use cases where you
would *not* have a one-to-one relationship between neutron networks and
neutron subnets in an OpenStack deployment? (e.g. one neutron network
associated with multiple neutron subnets, or one neutron network
associated with zero neutron subnets)?

Different tenants might both use the same subnet range on different layer 2 
networks.
One one layer 2 network, you might run dual stacked, ie, ipv4 and ipv6.

Supporting these use cases necessitates modeling them separately.

Cheers,
--
Stephen Gran
Senior Systems Integrator - theguardian.com<http://theguardian.com>
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