[ovs-discuss] MAC Learning event to Controller

[Ben Pfaff]

On Wed, Dec 09, 2020 at 10:37:42AM -0500, Vasu Dasari wrote:
> Ben,
> 
> Thanks for the response.
> 
> I expect the Learning event to come to the controller when a "learn"
> happens. In this case(as in tutorial), when a learn event happens, a new
> mac entry is added to table 10. Controller just needs to know that a learn
> event happened on this {port, Mac, Vlan}. This information is sufficiently
> populated in new flow information being added to table "10". So, I am
> leaning towards using a flow-monitoring on the table to see when an entry
> is added or removed to rely on MAC entry got added or removed to the
> switching pipeline.
> 
> "learn" action has options like "limit" which limits number of entries
> added to a table, "send_flow_rem" which tells the controller when a flow is
> removed, etc. All these flags are applied on top of the flows that are
> added. I was hoping to see an option like "send_flow_add" which tells the
> controller when a flow is added. Maybe this could be an enhancement to
> "learn" action. What do you think?

It sounds like flow monitoring already covers that.  Is there a reason
to duplicate the functionality?