IPv6 multicast address.

Hi Guys,

I have a query regarding IPv6 multicast address.

R1#sh ipv6 int fa0/0
FastEthernet0/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::CE03:CFF:FE98:0
  Global unicast address(es):
    2001::CE03:CFF:FE98:0, subnet is 2001::/64 [EUI]
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF98:0


I have setup gloabal address 2001::/64 [EUI] in this interface?

My question is why this interface is not joining a multicast group for this global address?

Isn't the group FF02::1:FF98:0 for the link local address  FE80::CE03:CFF:FE98:0? This is found out by appending last 24 bits of Link local address to FF02::1:FF.

Doesn't 2001::/64 [EUI] supposed to have a multicast address by appending 32 bits with FF02::1? Or is this also 24 bits. So that both are same for both link local and global

Krishna