From: Gregory Gombas (ggombas@gmail.com)
Date: Wed Oct 24 2007 - 13:35:52 ART
Hi Tarun,
If you are running IGMP snooping, would the switch flood the traffic
if there were no receivers and no routers on the vlan?
Thanks,
Greg
On 10/24/07, Tarun Pahuja <pahujat@gmail.com> wrote:
> Thomas,
> By default a layer 2 switch would flood multicast packets off
> all interfaces except the one where it received the frame from. if you want
> to forward multicast frames more intelligently then you should use CGMP or
> IGMP Snooping. IGMP snooping is used for devices that do not support cgmp,
> basically the receivers join the multicast group that they want to
> participate in and are the only ones on the switch that get the multicast
> packets for that group.
>
> Thanks,
> Tarun
>
>
> On 10/24/07, Gregory Gombas <ggombas@gmail.com> wrote:
> > Good question - is there a multicast enabled router on the segment? Is
> > MVR enabled? If not the switch will not forward the traffic beyond the
> > VLAN.
> >
> > As for within the VLAN itself, I'm curious myself how the switch will
> > handle the traffic. Since igmp snooping is enabled by default it will
> > keep track of what ports the receivers are on and only send multicast
> > to them.
> >
> > But what if there is no router and no receivers? Will the switch flood
> > to every port?
> >
> > On 10/24/07, thomas.rader@freesurf.ch < thomas.rader@freesurf.ch> wrote:
> > > Does anyone know what happens when a non-multicast routing enabled
> switch receives a multicast packet ?
> > >
> > > I assume it forwards it within the VLAN and drops it at layer 3 boundary
> (same rules as for broadcast ?)
> > >
> > > Thanks, Thomas
> > >
> > >
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