> I do not think we can ignore the rest of the network. The > SGSN needs a > mechanism to populate its forwarding table with mcast addresses - > that is where MLD snooping comes in.
=> I don't know if my earlier message failed to convey the picture but please ignore the SGSN, it is irrelevant to this discussion. All traffic MUST go to the GGSN and get routed there. That was exactly the point was making , till GGSN everything is on L2 - hence on the same link. > > Is the following a good representation of a cellular network ? > > > IPL1 IPR1 > Mobile 1--------(SGSN)------\ > (GGSN)--> > Mobile 2--------(SGSN)------/ > IPL2 IPR2 > > I am saying IPR1 = IPR2 , hence IPL1, IPL2, IPR1 all are on the same > link as SGSN are L2 devices. So if Mobile 1 subscribes to a > link-local > group and so does Mobile 2, then we need mcast forwarding between > them. => No. See my comment above. No routing before the GGSN. and Mobile 1 _cannot_ communicate to Mobile 2 using link-local addresses. Again, I am saying the same thing, GGSN (and SGSN) needs to know who are subscribing to the mcast group. -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
