Subject: Re: multicast routers on switches with IGMP snooping

From: [email-masked] (Brad Cain)
Date: Thu, 4 Jun 1998 16:43:23 -0400

> So what about switches that do IGMP snooping?  Since I know of no IGMP
> membership report 'for all groups', I suppose that one has to
> explicitly indicate to the switch which port(s) have multicast routers
> attached.

patrick,

we were trying to solve that very problem with:

  draft-ietf-idmr-igmp-mrdisc-00

this draft specifies a general multicast router hello protocol so that
switches can learn about multicast routers...

otherwise, you must snoop on all possible hello packets..

brad