All things related to multicast

["Richard Mavrogeanes" <>]

We've got several hundred mbps of multicast running 7x24 on our catalyst.  I 
believe you simply need to engage snooping, plus the catalyst has a very bad 
artifact: there must be at least one receiver to each multicast or it floods. 
 We get around this by having our sources join their own multicast.

hope this helps

Rich


-----Original Message-----
From: Alan Crosswell 
[mailto:]
Sent: Thursday, May 02, 2002 12:53 PM
To: 

Subject: link-layer IP multicast vs. L2 switches


Does anybody know if there's a way to get link-layer IP multicast to do
the "right thing"?  I discovered that my link-layer multicasts were being
flooded by my Catalyst 4000 switch.  I think maybe this is just the way it
is since I would guess that by definition link-layer multicast doesn't ever
speak to the IGMP router.

I guess I will implement my subnet multicast with admin-scoped groups and
filters on my routers instead....

Comments, corrections, commissertaion? :-)

/a