From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Wed Oct 24 2007 - 13:43:24 ART
> The default is to not block flooding of unknown multicast traffic out of a
> port, but to flood these packets to all ports.
>
> unless you configure "*switchport block multicast" * configurable on a
> per-interface basis
>
> http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12240se/scg/swtrafc.htm#wp1092204
>
>
>
> 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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