> The L2 p2p link ends at the BTS (?) , but the L3 subnet > ends at GGSN (?)
=> Not quite. The 'link', as seen by the IP stack, is p2p between the host and the GGSN. > which is a router. BTS supports multiple p2p links, any of > them can have a > mcast listener. So the BTS needs a way to figure out to > which L2 p2p link a > mcast packet needs to be forwarded. Without MLD support, > how does the L2 > switch know there is a mcast listener in the link so it can > copy a packet > to that link ? The only other way would be to manually > configure the L2 > switch - not scalable. => The BTS (node B) is not a switch and doesn't even terminate the radio link, so it can't route traffic directly between hosts. The _only_ node that can do that is the default router (GGSN). You can think of it as any p2p link used today. Hesham -------------------------------------------------------------------- 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] --------------------------------------------------------------------
