Re: Question about group ID ipv6 multicast addresses

On 9/20/10 5:13 PM, Kunal Shah wrote:
> Hi Brian,
> 
> Thaks for your resonse. For group ID range 0x40000000 to 0x7FFFFFFF,
> can these group IDs be ever present in mcast addresses contained in
> MLD reports i.e Can customers have their STBs send out MLD joins for
> mcast addresses containing group IDs in this range??

Yes.  A node should send an MLD Report for all joined multicast
addresses except the All-Hosts address.  That is clearly stated in the
MLD specifications.

> 
> If group ID ranges 0x00000001 to 0x3FFFFFFF and 0x40000000 to
> 0x7FFFFFFF cannot be present in mcast addresses coming in a MLD
> report, does this mean only the range 0x80000000 to 0xFFFFFFFF can be
> used with mcast addresses inside MLD reports??
> 

I think you are confused.  All of the group IDs can occur in multicast
addresses.  What RFC 3307 does is specifies the type of multicast
address that can contain each of the group ID ranges.

Regards,
Brian