Mukul,
For the same reason that RFC 2373 only uses the lower 32 bits
for multicast group IDs. It makes the mapping into IEEE 802 multicast
MAC addresses less likely to lead to collisions.
Regards,
Brian
Mukul Chawla wrote:
>
> Im not clear why draft-ietf-ipngwg-uni-based-mcast-02.txt, Section 3
> looks _only_ at IPv6 mcast addresses created by mapping 32 bit IEEE 802
> MAC addresses (RFC2373, 2.7.2) rather than creating an SSM service range
> in IPv6 which uses 112 bit group IDs? What am I missing here? Is there
> an IPv6 SSM range which uses 112 bit group IDs?
>
> Thanks,
> Mukul
>
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