On Mon, Jan 09, 2017 at 12:44:19PM +0100, M. Braun wrote: > Am 09.01.2017 um 09:08 schrieb Johannes Berg: > > Does it make sense to implement the two in separate layers though? > > > > Clearly, this part needs to be implemented in the bridge layer due to > > the snooping knowledge, but the code is very similar to what mac80211 > > has now. > > Does the bridge always know about all stations connected? The bridge does not always know about all stations, especially the silent ones like in your DVB-T example. However, concerning IP multicast, there is IGMP/MLD. So the bridge does know about all stations which are interested in a specific IP multicast stream. (As long as there is a querier on the link, which periodically queriers for IGMP/MLD reports from any listener. If there is no querier then the bridge multicast snooping, including the bridge multicast-to-unicast will fall back to flooding) So if your television example uses IP multicast properly, it is completely doable with the bridge multicast-to-unicast, thanks to IGMP/MLD.
