All things related to multicast

["David Farmer" <>]

Basically, we were able to make it work, but that was a while ago.  Your 
router needs to do CGMP, which means it must be a Cisco, at least I haven't 
heard of any other routers that do CGMP.  If you have a mixture of switches, 
some doing CGMP and others doing IGMP snooping, you have to be very 
careful. Cisco has a white paper or config note on how to make that 
situation work. 

Personally, I liked the idea of CGMP, it had the router making Layer 3 
decisions and telling the switchs which end stations wanted which groups.  
But, I really don't think Cisco has continued development of it, so I'm not 
sure how well it will works with things like IGMPv3 and SSM.  And, while I 
liked the design it still had some problems, which I can't completely 
remember. 

On 16 Feb 2006 Roy D. Hockett wrote:  

> 
> Anyone have any experience with running CGMP/multicast on the
> catalyst 1900 switches?  If so what are you what isssues have you run 
> into?
> 
> Thanks,
> --Roy
> 
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