> Send-only nodes MUST use MCAP to determine whether or not the multicast
> group has been already mapped to a channel other than the default broadcast
> channel.
Oops! Sorry, I was wrong.
Kenji Fujisawa pointed out that I misread the text in "9.4 Multicast
transmit" of RFC2734 (IPv4 over 1394). The above should be read:
"If a node wishes to transmit the multicast data to
other than default channel, it MUST confirm whether or not the
multicast group has been already allocated to the channel."
The correct text to be included should be:
| 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 implementation of MCAP is optional for send-only nodes. A node
| MAY transmit multicast data addressed to any multicast addresses
| into the default broadcast channel regardless of the existing
| allocation of the channel. If a node wishes to transmit multicast
| data on other than the default channel, it MUST first confirm by
| MCAP whether or not a channel number for the group address has been
| already allocated.
Atsushi Onoe
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