Subject: Re: cpsw_switch: unable to selectively forward multicast

From: Andrew Lunn <[email-masked]>
Date: Wed, 25 May 2022 23:05:14 +0200

On Wed, May 25, 2022 at 11:30:40AM +0200, Markus Klotzbuecher wrote:
> Hi All,
> 
> I'm using multiple am335x based devices connected in a daisy chain
> using cpsw_new in switch mode:
> 
>              /-br0-\          /-br0-\         /-br0-\
>             |       |        |       |       |       |
>         ---swp0    swp1-----swp0    swp1----swp0    swp1
>             |       |        |       |       |       |
>              \-----/          \-----/         \-----/
>                #1               #2              #3
> 
> The bridge is configured as described in cpsw_switchdev.rst
> [1]. Regular unicast traffic works fine, however I am unable to get
> traffic to multicast groups to be forwarded in both directions via the
> switches.

Do you have listens reporting they are interested in the traffic via
IGMP? Do you have an IGMP quirer in your network? Without these, IGMP
snooping will not work.

	 Andrew