From: Tarun Pahuja (pahujat@gmail.com)
Date: Wed Oct 24 2007 - 13:33:20 ART
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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