[openstack-dev] [Neutron][IPAM] Uniqueness of subnets within a tenant

John Belamaric jbelamaric at infoblox.com
Wed Mar 11 16:37:51 UTC 2015

Here is a compromise option. The pluggable IPAM will be optionally enabled
in Kilo. We could introduce the restriction, but only when pluggable IPAM
is enabled. Support for having a tenant with overlapping IP space, along
with pluggable IPAM would wait until Liberty, when we can fully implement
the "address scope" concept. This concept was discussed during the spec
reviews of pluggable IPAM, and is simply adding a first-class object that
represents a layer 3 address space. A subnet would belong to a specific
scope, and any IP within a scope would be unique. To support the tenant
with overlapping space, you would create multiple scopes for that tenant.

This option maintains backward compatibility for existing deployments,
while allowing us to improve the model moving forward.


On 3/11/15, 2:22 AM, "Carl Baldwin" <carl at ecbaldwin.net> wrote:

>On Tue, Mar 10, 2015 at 11:34 AM, Gabriel Bezerra
><gabrielb at lsd.ufcg.edu.br> wrote:
>> Em 10.03.2015 14:24, Carl Baldwin escreveu:
>> I'd vote for allowing against such restriction, but throwing an error in
>> case of creating a router between the subnets.
>> I can imagine a tenant running multiple instances of an application,
>> one with its own network that uses the same address range, to minimize
>> configuration differences between them.
>I see your point but yuck!  This isn't the place to skimp on
>configuration changes.
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