[ovs-dev] [PATCH v2 1/3] ovn: Update TODO, ovn-northd flow table design, ovn-architecture for L3.

[Amitabha Biswas]

Hi,

I have some initial questions in this design.

> On Sep 30, 2015, at 1:56 PM, Ben Pfaff <blp at nicira.com> wrote:
> 
> This is a proposed plan for logical L3 in OVN.  It is not entirely
> complete but it includes many important details and I believe that it moves
> planning forward.
> 
> +* L3 support
> +
> +** OVN_Northbound schema
> +
> +*** Needs to support interconnected routers
> +
> +It should be possible to connect one router to another, e.g. to
> +represent a provider/tenant router relationship.  This requires
> +an OVN_Northbound schema change.

It’s not obvious to me what the NB schema change involved here will be? Will the the router ports connecting 2 routers be treated as a special case?

> +
> +*** Needs to support extra routes
> +
> +Currently a router port has a single route associated with it, but
> +presumably we should support multiple routes.  For connections from
> +one router to another, this doesn't seem to matter (just put more than
> +one connection between them), but for connections between a router and
> +a switch it might matter because a switch has only one router port.

From an OpenStack integration point of view is this for supporting multiple subnets in a Logical Network? If so I would imagine this would involve a OVN_NB schema change for the Logical Router Port [each supporting multiple routes] or Logical Switches having a list of router ports.

For e.g. let’s say say we have 2 subnets in one Logical Switch (LS1) and 1 subnet in another Logical Switch (LS2). This would requires 3 (or 2?) “logical patch” ports pairs in the OVN_SB schema below.

Thanks
Amitabha