[ovs-discuss] [ovn] API related questions

Ben Pfaff blp at nicira.com
Mon Oct 12 17:27:11 UTC 2015


On Mon, Oct 12, 2015 at 11:56:47AM -0500, Murali R wrote:
> From the link in the previous email
> http://openvswitch.org/pipermail/dev/2015-January/050380.html
> 
> "Matching expressions provide a superset of OpenFlow matching capabilities
> across packets in a logical datapath. Expressions use a syntax similar to
> Boolean expressions in a programming language."

This describes the matching syntax.  I don't see how it implies that
users can modify flows directly.

> I was able to use customized flows in ovs-agent to accomplish flow
> modifications using ovs-ofctl add-flow. I was expecting we could modify for
> logical flows using the ovn-northd but with logical ports. If the flow mods
> can only be done from within northd, then I need to start looking into that
> code. It is definitely better to have some api be exposed to define the
> match and actions and customize flows using lports.

The intended CMS interface to OVN is through the northbound database.

Maybe you should explain what you are trying to accomplish.

> When I say user, I mean a CMS.

Understood.



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