From: John Conzone (jkconzone@xxxxxxxx)
Date: Tue May 02 2000 - 19:19:22 GMT-3
Okay. Well it just so happens that the design calls for a 6509 with a
MFSC as the core connected to multiple 5500's. So are you saying that the
Virtual interfaces on the 6500 that I'll use to route between VLAN's don't
support CGMP? How will it communciate mutlicast control info with the
5500's? Also, do I ned to enable anything on the other routers connected to
the 6500?
----- Original Message -----
From: "Joel W. Ekis" <jekis@cisco.com>
To: "John Conzone" <jkconzone@home.com>; "ccielab" <ccielab@groupstudy.com>
Sent: Monday, May 01, 2000 9:12 PM
Subject: Re: controlling multicasts in a switched environment
> 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!
>
>
>
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