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Posted by Ned on November 12, 2005, 4:39 pm
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Thanks for the tip. I'll test for that just to see for myself.
NH
Michael Roberts wrote:
> Ned wrote:
> > I've read alot about IGMP snooping but I'm still not sure if the device
> > creating the multicast traffic has to have some sort of IGMP snooping
> > feature. I think the answer is no and that it is all handled by the
> > network switch and routers. Can someone confirm this?
> >
> > Also, I put a packet sniffer (Ethereal) on my switch and created
> > multicast traffic on the other end of the Wan. I could see the traffic
> > on my switch even though IGMP Snooping was configured. I have 3Com
> > switches and Marconi switches and router on the ATM Wan. Any
> > suggestions? Can I build my own IGMP Querier??
> >
> > Thanks
> > NH
> >
> Ned,
> Be aware that if you do not have a receiver on a switch, but you have a
> source, the multicast traffic may get flooded to all ports. Snooping
> relies on seeing IGMP membership queries from hosts to make decisions on
> which ports to prune and graft. If there are no receivers on the
> switch, there might not be any membership queries (depending on the
> operation of the source), so the switch would flood. Nortel has
> implemented features that control multicast flooding when there is no
> registered receiver on a switch. I am not sure what other vendors have
> out there. Iperf is a really easy tool to use in multicast mode. We
> use it to verify multicast all the time. Not sure if this will help or
> not...
>
> -mike
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