Atsushi Onoe <[EMAIL PROTECTED]> writes:
> Similarly, we, authors, would like to change the text of IPv6 over IEEE1394
> as follows:
> | 9. IPv6 MULTICAST
> |
> | By default, all best-effort IPv6 multicast MUST use asynchronous
> | stream packets whose channel number is equal to the channel field
> | from the BROADCAST_CHANNEL register. In particular, datagrams
> | addressed to all-nodes multicast addresses, all-routers multicast
> | addresses, and solicited-node multicast addresses [AARCH] MUST use
> | the default channel specified by the BROADCAST_CHANNEL register.
> |
> | Best-effort IPv6 multicast for other multicast group addresses may
> | utilize a different channel number if such a channel number is
> | allocated and advertised prior to use, by a multicast channel
> | allocation protocol (MCAP), as described in [IP1394]. The
> | implementors are encouraged to use this protocol when transmitting
> | high-rate multicast streams. When a node wishes to receive multicast
> | data addressed to other than all-nodes multicast addresses, all-
> | routers multicast addresses, and solicited-node multicast addresses,
> | it MUST confirm if the channel mapping between a multicast group
> | address and a channel number exists using MCAP, as described in "9.3
> | Multicast Receive" in [IP1394].
> |
> | The MCAP 'type' value for IPv6 group address descriptor is {to be
> | assigned by IANA}.
I think this text is much better. It is clear now that all nodes must
implement at least enough of the MCAP protocol to properly process
receives from channels other than the broadcast. Send-only nodes (do
they exist?) could presumably not implement any of MCAP and still be
compliant. Is this the intent? Or is the intent really to require it
for both senders and receivers, but then encourage senders to actually
use MCAP? One of the things that is unspecified in RFC 2734 is when to
allocate a separate multicast channel and when to use the broadcast
one. I gather that experimentation/experience is needed in this space.
One other nit. I would suggest changing one sentence as follows:
> | Best-effort IPv6 multicast for other multicast group addresses may
> | utilize a different channel number if such a channel number is
> | allocated and advertised prior to use, by a multicast channel
s/by a/by the/
I.e., there is only one such protocol, and it is MCAP.
> | allocation protocol (MCAP), as described in [IP1394]. The
Thomas
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