Pekka Savola wrote:
> Note: it seems to me that the scope of the resulting multicast address
> must not be greater than the generating unicast address scope. This is
> because e.g. 'subnet ID + interface ID' in e.g. global scope could clash
> from the same values from other sites.
Yes, you are right. Properly, our site-local multicast addresses are used
when scop <= 5.
> GLOP-based allocation seems pointless when you can use unicast
> prefix-based allocations (useful only if you want to zero-configure so
> that every node can possibly start generating global multicast traffic
> without assignments from the _site_ owner). Site- and link -local
> allocations would only seem to be usable within the respective site, or
> link.
Regarding GLOP-based IPv6 multicast addresses, we received some comments
from Dave Thaler. He proposed,
GLOP-based IPv6 multicast addresses are much less powerful and has no
advantages over Unicast-prefix-based addresses.
So, we decided to follow his opinion.
Instead, in the case of link- or site-local multicast addresses,
we and Dave agreed the
in order to make the syntax consistent with the Unicast-Prefix-based
multicast draft, our 00 draft would be changed as follows :
(we will publish revised version soon.)
3.1 Link-local multicast addresses
| 8 | 4 | 4 | 16 | 64 | 32 |
+--------+----+----+------------+----------------+---------------+
|11111111|flgs|scop| reserved | Interface ID | group ID |
+--------+----+----+------------+----------------+---------------+
3.2 Site-local multicast addresses
| 8 | 4 | 4 | 16 | 64 | 32 |
+--------+----+----+------------+----------------+---------------+
|11111111|flgs|scop| SLA | Interface ID | group ID |
+--------+----+----+------------+----------------+---------------+
In addition, in stead of defining define a new flag,
we will use same flag defined in the Unicast-Prefix-based draft.
We and dave think we might be able to update the other draft to allow to
do this in our draft.
I think, our proposal can be used in link- or site-local,
harmonizing with Unicast-Prefix-based multicast scheme
(while Unicast-Prefix-based multicast addresses are for global.).
Thanks,
Myung-Ki.
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