Subject: Re: IP multicasting and ethernet switches

From: Guenther Schmittner <[email-masked]>
Date: Sat, 23 May 98 09:56 SET

Hello Istvan,
> We are about to introduce MBONE and multicasting in an environment
> where:
>
>    Cisco 7000 --- ATM switch --- Catalyst 5000
>                 (Lan emulation)    ethernet
>                                     switch
>
> The DVMRP tunnel ends at the Cisco 7000. My question is: How
> could one limit the multicast traffic only on those segments/ports on
> the Catalyst that really participates in multicast sessions ? What
> I would like to avoid is flooding those segments that do not listen
> any multicast program.
>
> In short are the ethernet switches IP multicast aware ?
>
> I am aware that the switches work on level 2 and IP multicasting
> is at level 3.  Still the question might be valid.
>
You have to enable CGMP on both router and Catalyst.

Kind regards,
Guenther