netdev - Re: [PATCH] iproute2: Extend ip address command to enable multicast group join/leave on IP level.

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Date:	Tue, 17 Feb 2015 11:34:18 -0500
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Madhu Challa <challa@...ronetworks.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH]     iproute2: Extend ip address command to enable
 multicast group join/leave on IP level.

On Mon, 16 Feb 2015 14:23:35 -0800
Madhu Challa <challa@...ronetworks.com> wrote:

>     Joining multicast group on ethernet level via "ip maddr" command would
>     not work if we have an Ethernet switch that does igmp snooping since
>     the switch would not replicate multicast packets on ports that did not
>     have IGMP reports for the multicast addresses.
> 
>     Linux vxlan interfaces created via "ip link add vxlan" have the group option
>     that enables then to do the required join.
> 
>     By extending ip address command with option "autojoin" we can get similar
>     functionality for openvswitch vxlan interfaces as well as other tunneling
>     mechanisms that need to receive multicast traffic. The kernel code is
>     structured similar to how the vxlan driver does a group join / leave.
> 
>     example:
>     ip address add 224.1.1.10/24 dev eth5 autojoin
>     ip address del 224.1.1.10/24 dev eth5
> 
> Signed-off-by: Madhu Challa <challa@...ronetworks.com>

You need to get MCAUTOJOIN into net-next first.
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