[ovs-dev] Support for MCAST_Snooping

[Neethi Shashidhar]

Hi,

    It is a openstack setup that we are using. To be more clear with the
configuration:

     -> we have set  *mcast_snooping_enable=true* on *br-int* of OVS on
both the compute nodes.

     -> *mcast-snooping-flood=true *for *Patch-tun* port of br-int on both
compute nodes ( so that the multicast traffic reaches the compute node 2
via br-tun).

we can see that the igmp membership report is recieved on *br-int* (via
br-tun) of compute node 2 ,which may be sent via vm1 or vm2( Acting as
Recievers) .Flows on* br-int *of the compute nodes have "*normal*" action.
An *mdb/show* on the first compute node shows that the packets have been
snooped. The same is not true for the second compute node. Is there
something amiss here?

Regards,
Neethi









On Tue, Dec 9, 2014 at 1:04 AM, Flavio Leitner <fbl at redhat.com> wrote:

> On Mon, Dec 08, 2014 at 10:28:14PM +0530, Aman Kumar wrote:
> > Hi all,
> >
> > Thanks again, because of your help it is working fine but i have a
> problem
> > with 2 compute nodes(each one is having different OVS),
> > below is the complete scenario.
> > [image: Inline image 1]
> >
> > Here, when receiver VM1 sends IGMP v2 reports, it reaches to OVS2 also
> but
> > only OVS1 is able to Snoops that but OVS2 is not able to snoop.
> > So, Now my question is that does ovs snoops only to those ports which is
> > connected to host?
> > Can't it snoop the other port which is not connected to host but IGMP
> > report is coming from there?
> > here br-tun and br-int is bridges on ovs, i have enabled the snooping on
> > br-int
>
> I am confused with your problem description.  If you configured the
> port as multicast flood port or if it is a multicast router port, then
> the bridge will not learn any Report coming there because they are
> automatically used to send multicast packets anyway.  Flood ports are
> configured by the admin.  The mcast router port is automatically set
> when a Query is received (you can check in the mdb).
>
> Other than that, the bridge should snoop any packet passing through it
> using the action NORMAL regardless if it's connected to a host or not.
>
> fbl
>
>
>