All things related to multicast

["Wallace, Steven S" <>]

True you don't need IGMP for multicast sources, however a multicast source
not also sending IGMP host reports, will flood the local broadcast domain
(ie. flood to all ports on an IGMP snooping switch).  At IU's request, the
Camvision2 folks make a small application that can simply send IGMP host
reports out the Ethernet interface, so that switch can prune the group from
no-listener ports.  I'm not sure that's getting at your original problem.
Steven

> -----Original Message-----
> From: Steve Francis 
> [mailto:]
> Sent: Wednesday, December 15, 1999 6:48 PM
> To: Alan Crosswell
> Cc: 
> 
> Subject: Re: howto do set up multicast in a pim-sm w/o IGMP?
> 
> 
> Not knowing what a Camvision2 is, I'll assume its a multicast source.
> 
> If that's true, you dont need IGMP: a multicast source just starts
> multicasting, with no prior signalling.  That will cause the 
> local router to
> build the multicast tree for that source.
> 
> Alan Crosswell wrote:
> 
> > I have just learned from Litton that the Camvision2 
> multicast support does
> > not do IGMP.  Is there an IGMP proxy available that I could 
> use?  Am I
> > correct in assuming that if I'm running pim-sm that I need IGMP to
> > cause the tree to be built? I am also using Catalyst with 
> cgmp or igmp
> > snooping....
> >
> > I have my Littons for another 7 days before the eval runs out and
> > would like to try some IP multicast now that I've 
> "finessed" unicast.
> >
> > /a (still somewhat confused by most of this)
>