[ovs-dev] [ovs-discuss] OVS fdb - MAC learning Subscription

Ben Pfaff blp at ovn.org
Mon Jul 4 21:30:01 UTC 2016


On Mon, Jul 04, 2016 at 09:16:22PM +0530, Kapil Adhikesavalu wrote:
> Hi Ben,
> 
> Thanks for the information. This is exactly what I was looking for.
> 
> My implementation involves around 3K dynamic MACs.
> 
> Couple of questions,
> 
> 1. MAC eviction on table full. I took a look at NORMAL action Mac learning
> code. It had implemented MAC eviction by giving fair share of entries for
> the each port in the table.
> 
> Is there something similar available for LEARN action? I didn't find a way
> to configure it.

Yes, see the documentation for the Flow_Table table in
ovs-vswitchd.conf.db(5).

> I am concerned about the case where DOS attack is done by sending ton of
> MAC on one port leading to flushing of MACs in other ports.
> 
> 2. Will there be any noticeable performance difference between using action
> NORMAL and LEARN. Assuming there wouldn't be too much MAC movement.

I would expect performance to be similar.



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