From: Manny Gonzalez (manny@xxxxxxx)
Date: Mon Jan 07 2002 - 18:00:45 GMT-3
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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