From: Scott Hoover (dizzy74_98@xxxxxxxxx)
Date: Mon Jan 07 2002 - 18:48:42 GMT-3
CGMP is disabled by default. You must enable CGMP on
the CAT (set cgmp enable) and on RA (ip cgmp).
Without igmp, cgmp is effectively worthless (in Cisco
land anyway).
--- Manny Gonzalez <manny@nyp.org> wrote:
> I believe CGMP is enabled by default on Cisco
> devices. It is on by
> default on CAT5000's I am pretty sure and since
> routers do Multicast all
> the time (remeber that EIGRP,OSPF,RIPv2,etc. use
> Multicast) it may be
> that all you need is to turn on the ROUTING of such
> protocols.
>
> IGMP is strictly the standard way for devices to
> join/leave a Mcast
> group...
>
> I might have this a little off so I will defer to
> the real experts that
> will eventually jump on this topic. I can always
> learn new stuff on
> Multicast. :-)
>
> Hans wrote:
> >
> > Hi all,
> >
> > Here is the Cisco website dealing with CGMP/IGMP:
> >
> > http://www.cisco.com/warp/public/473/22.html#conf
> >
> > However, after reading it, I still got a question:
> >
> > Assuming we have the following topology:
> >
> > host 1/e0------e0/RA/e1----port1/switch
> 1/port2------e0/RB
> >
> > If I want to turn on CGMP between the link with
> switch 1 and RA, on RA for
> > CGMP to work, do I also need to put in ip igmp on
> interface e1? I mean, is
> > ip igmp a must to enable CGMP to work on RA?
> >
> > Need your help on this.
> >
> > Thanks,
> >
> > Hans
> eMGee
>
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