[OpenWrt-Devel] [PATCHv2 netifd 3/3] bridge: Allow setting multicast_router option

Felix Fietkau nbd at openwrt.org
Wed Aug 5 07:39:05 EDT 2015

On 2015-08-05 01:00, Linus Lüssing wrote:
> The multicast_router option of a bridge allows to control the forwarding
> behaviour of multicast packets independant of the listener state:
> * 0: Only forward if specific listener is present
> * 1 (default): Forward if specific listener or a multicast router
>   was detected (currently only learned via query messages, no MRD
>   support yet)
> * 2: Always forward any multicast traffic on this port
> Since MRD is not mandated you might end up with silent multicast routers
> (e.g. if your link has more than one multicast router; only one can
> become the selected, "noisy" querier). Here you might need a manual
> configuration option like the "multicast_router" option.
> Other scenarios where this can be useful are for instance:
> * Segmentation of IGMP/MLD domains together with ebtables
> * Dedicated bridge port for monitoring/debugging purposes
> Signed-off-by: Linus Lüssing <linus.luessing at c0d3.blue>
This should also be stored in the bridge specific config instead of
generic device config.

- Felix
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