From: Joel W. Ekis (jekis@xxxxxxxxx)
Date: Mon May 01 2000 - 22:12:08 GMT-3
PIM is used for L3 routing control purposes. To help the switch understand
which ports need a specific multicast stream use the following interface
command 'ip cgmp'. It would be unlikely that you would use CGMP and not use
PIM. You can use PIM without CGMP, especially on the C6k - it only does IGMP
Snooping.
PIM stands for Protocol-Independent Multicast, it uses any route in the routing
table, routing protocol origin is immaterial. IGMP is a group management
protocol, not a routing protocol.
Joel
Try having a Pale Ale (I prefer Boulevard - local KC beer); great for
un-freezing brains. ;-)
At 07:44 PM 5/1/2000 -0400, John Conzone wrote:
>
> I've been exploring multicast control using CGMP on Catalyst switches. I
> see that CGMP is on by default, and creates lists of hosts who have joined
> multicast groups and forwards multicast packets only out ports to those
> hosts. The fast leave feature decreases the time it akes for a host top be
> deleted from a group, or is it the time it akes to delet a group.
> Anyway, my real question is that all the documentation states that this
> must work in conjunction with a router enabled with CGMP. Does this mean a
> router with PIM enabled on its interfaces? I'm a little confused. I thought
> PIM used IGMP.
> Or can you enable CGMP on routers without PIM. OR does PIM invoke both?
> AHHHHHHHHHHHHH!!!!! Cisco brain freeze!
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:23:26 GMT-3