[16NG] Re: multicast and IPv6 over ETHCS

[Alexandru Petrescu <alexandru.petrescu at motorola.com>]

Jihoon Lee wrote:
> Hi Alex,
> I agree with that.

I also agree, more specifically for IPv6-over-ETHCS document to not 
specify how to implement link-layer multicast behaviour.

If the draft is separated in two separated documents IPv6-over-ETHCS and 
IPv4-over-ETHCS, then I will suggest the following multicast text, for 
the IPv6-over-ETHCS document.

Do you think this text makes sense in the context of this document?  Do 
you agree with the text or portions of it?  Anything wrong with this text?

Thanks,

Alex

> Running IPv6 over an Ethernet link needs the support of link-layer 
> multicast.  In the 802.16 context, the Ethernet Convergence Sublayer 
> (also known as the IEEE Std 802.3/Ethernet-specific part of the IEEE 
> 802.16 Packet Convergence Sublayer) must (1) support multicast 
> link-layer addresses (2) map IPv6 multicast addresses to link-layer 
> addresses and vice-versa, (3) offer the capability of joining and 
> leaving IPv6 link-local multicast groups and (4) send and receive 
> IPv6 link-local multicast packets whose link-layer headers contain 
> link-layer multicast addresses.
>
> The following link-layer multicast addresses are recommended by 
> RFCXXXX: 33:33:0:0:0:1, 2, 33:33:ff:XX:XX:XX, and others [fill].
>
> The rules for mapping IPv6 link-local multicast addresses to 
> link-layer multicast addresses are recommended by RFCxxxx and are the
> following:
>
>     - ff02::1 maps into 33:33:00:00:00:1
>     - and the others.

> The IPv6 stack must join a certain link-local IPv6 multicast group 
> before receiving packets addressed to that group.  For example, 
> before receiving a Router Advertisement the stack MUST join the IPv6 
> link-local multicast address 'all-nodes'.  When the IPv6 stack on the
> Subscriber Station joins a certain IPv6 link-local multicast group it
> MUST receive all packets addressed to that group.  The join operation
> can happen in several ways: sending a MLD REPORT (RFCxxx), setting a
> local filtering rule, etc.
>
> The IPv6 stack must be able to leave a certain IPv6 link-local 
> multicast group.  When the IPv6 stack leaves a group must no longer 
> receive the IPv6 packets addressed to that group.  Similarly to the 
> joining operation the leaving operation can happen in several ways: 
> sending a MLD REPORT, setting a local filtering rule, etc.
>
> The following Neighbour Discovery messages are sent by a Subscriber 
> Station to IPv6 link-local multicast addresses: Neighbour 
> Advertisement, Neighbour Solicitation, Router Solicitation (RFCxxxx).
> The following Neighbour Discovery messages are received by a
> Subscriber Station, addressed to IPv6 link-local multicast addresses:
> Router Advertisement, Neighbour Advertisement, Neighbour 
> Solicitation.

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