[ovs-discuss] Static CAM table

[Tom Gajewski]

There has to be something inherently wrong with that flow since once I
enter it, the machine behind port 13 cannot get out anywhere -- and no
traffic can reach it, even once there is an actual entry in the
mac-table. So I'm effectively breaking all traffic to port 13 and MAC
so:me:ma:cc. Can someone point me at a properly constructed flow to
accomplish this?

On Mon, Oct 17, 2016 at 11:01 AM, Ben Pfaff <blp at ovn.org> wrote:
> I would generally expect that to work.
>
> Maybe you should show us more of your flow table.
>
> On Mon, Oct 17, 2016 at 10:14:16AM -0700, Tom Gajewski wrote:
>> My bad, that was obviously suppose to include the MAC in question. So
>> one more time, in an attempt to set a static MAC table entry:
>>
>> Table entry:
>>
>> 13   744  so:me:ma:cc
>>
>> Flow:
>>
>> ovs-ofctl add-flow mybridge dl_dst=so:me:ma:cc,actions=output:13
>>
>> I guess what I'm asking is, what should a static flow that says "MAC
>> so:me:ma:cc lives on port 13" look like? Again, goal is to have a
>> static table entry like behavior accomplished with this flow.
>>
>> Cheers,
>>
>> --Tom
>>
>> On Mon, Oct 17, 2016 at 9:12 AM, Ben Pfaff <blp at ovn.org> wrote:
>> > On Mon, Oct 17, 2016 at 02:45:06AM -0700, Tom Gajewski wrote:
>> >> Hi all,
>> >>
>> >> It is my understanding that one cannot modify the cam (well I guess in
>> >> openvswitch land the mac table ;] ) directly. As I'm trying to set up
>> >> static entries. Do I need to use flows to accomplish this, is there no
>> >> other way to just modify this table??
>> >>
>> >> As for flows, I did try to add some copying an outdated entry from the
>> >> mac table that read
>> >>
>> >> 13   744  so:me:ma:cc
>> >>
>> >> like this -->
>> >>
>> >> ovs-ofctl add-flow mybridge dl_dst=,actions=output:13
>> >>
>> >> but that just seemed to do nothing, in fact in breaks connectivity to
>> >> that destination completely even if that MAC is in the table. So if I
>> >> do have to use flows to do this could someone tell me where I'm being
>> >> stupid?
>> >
>> > There's no direct way to modify the MAC-learning table.
>> >
>> > I don't know a reason why the flow that you've showed us would cause
>> > such big problems.  The command does omit the MAC address, but that
>> > would only cause an error from ovs-ofctl, so I guess that the actual
>> > command included the MAC.
>> >
>> > Maybe you should show us more of your flow table.