> I'm pretty sure the catalyst switches can be set to do multicast more > effeciently by setting 'ip cgmp' on them, though I haven't confirmed > this. With 'ip cgmp' set on, machines can join and leave multicast > channels as they please and the switch will only direct packets to those > machines that need to listen to them. Normally though, the switch is > literally just broadcasting out each and every multicast ip packet to > every machine on the lan/vlan. I don't have direct access to the > catalyst switches at work and I haven't gotten the admin in charge to > make the change. So in this way if the ganglia community just had a > quick html page with confirmed tips on switch configuration it would be > a big help.
http://ganglia.sourceforge.net/ganglia_docs/notes.html#NOTES-CISCO -matt
