On 18/01/2021 23:50, Vladimir Oltean wrote:

On Mon, Jan 18, 2021 at 11:39:27PM +0200, Nikolay Aleksandrov wrote:

quoted

Apologies for the multiple emails, but wanted to leave an example:

00:11:22:33:44:55 dev ens16 master bridge permanent

This must always exist and user-space must be able to create it, which
might be against what you want to achieve (no BR_FDB_LOCAL entries with
fdb->dst != NULL).

Can you give me an example of why it would matter that fdb->dst in this
case is set to ens16?

Can you dump it as "dev ens16" without it? :) 
Or alternatively can you send a notification with "dev ens16" without it?

I'm in favor of removing it, but it is risky since some script somewhere might
be searching for it, or some user-space daemon might expect to see a notification
for such entries and react on it.