[openstack-dev] [Neutron] Provider Router topology

Salvatore Orlando sorlando at nicira.com
Wed Nov 12 09:49:41 UTC 2014

Hi Jaume,

The concept of provider router is useful as it maps what actually already
happens in several infrastructures. I am not entirely sure that this
however implies we need to expose new API constructs and change the
topology API.

The provider router perhaps can exist in a concealed way, where tenants
still put gateways on an external network, but that would be implemented
with a provider router.

Anyway, I am sure you are aware of the technical debt repayment activities
scheduled for Kilo. Some of them pertain the l3 agent [1], and I'd say
those have the highest priority. If this spec will bring non-negligible
changes in the l3 agent, perhaps it's the case of doing that after the
agent restructuring to avoid conflicts which will slow down everything.

Finally, can you post the specification for this work in gerrit? It seems
it is not the one under the 'edge router' name [2]


[1] https://review.openstack.org/#/c/131535/
[2] https://review.openstack.org/128272

On 31 October 2014 10:01, Jaume Devesa <devvesa at gmail.com> wrote:

> Hi all,
> in Midokura we are working on a blueprint to define a new kind of topology
> for floating ranges, as alternative to external network topology. It is
> based on the idea of a Provider Router that links directly with Tenant
> Routers using /30 networks. It aims to be more pure-floating, helping the
> deployment of floating ranges across different physical L2 Networks. (We
> know there is some interest in this[1]) We think that also it might help in
> add Firewall specific policies at the edge of the cloud and define
> per-tenant or per-network QoS definitions.
> Document[2] is still WIP, with high level ideas and just some API details.
> But we would love to hear Neutron community feedback to go further in a
> steady way. In the implementation level, we are concerned in being
> compatible with current DVR and don't add a new SPOF in Neutron OVS plugin.
> So DVR developers feedback would be highly appreciated.
> We are also interested in chat about it during the summit, maybe during
> the Kilo L3 refractor BoF? [3]
> Thanks in advance!
> PD: Blueprint is here[4]
> [1]: https://blueprints.launchpad.net/neutron/+spec/pluggable-ext-net
> [2]:
> https://docs.google.com/a/midokura.com/document/d/1fUPhpBWpiUvBe_c55lkokDIls--4dKVSFmGVtjxjg0w/edit#
> [3]: https://etherpad.openstack.org/p/kilo-l3-refactoring
> [4]:
> https://blueprints.launchpad.net/neutron/+spec/neutron-provider-router
> --
> Jaume Devesa
> Software Engineer at Midokura
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> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
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