Re: [MBONED] [multrans] New Version Notification for draft-tsou-multrans-addr-acquisition-00.txt for the 2nd item "Multicast Source Discovery" of the interim meeting

[Tom Taylor <[e-mail]>]

Comments below, marked by [PTT].

On 27/12/2011 11:21 AM, Ronald Bonica wrote:
> Tina,
>
> In order to make this document more readable, you might want to add
> text like the following to the introduction:
>
> In order to receive desired content, the receiver must signal Data
> Items A, B and C to the network. The sender is capable providing Data
> Item A, B and D. Therefore, the problem is to transform data items A,
> B and C into Data Items A, B and D.
>
> In your document, you identify the IP multicast address as being one
> of those data items that might require transformation. Are there
> others?

[PTT] As I see it, the wording you are looking for is this:

"To request a program instance that has been selected by the user, the 
receiver must signal the corresponding multicast group address and, 
depending on the deployment, unicast source address. In the IPTV case, 
it acquires these addresses from an electronic program guide supplied by 
the provider. During the transition from IPv4 to IPv6, it may happen 
that the IP version supported by the source network differs from that 
supported by the receiver. As a result, if the receiver and/or the 
electronic program guide is unchanged, the receiver will be unable to 
find addresses it recognizes and can use for signalling in the 
electornic program guide.

"In cases other than IPTV, the receiver may receive the addresses it 
needs for signalling in a SAP (Session Announcement Protocol, RFCxxxx) 
announcement or directly through session-level signalling. For purposes 
of the analysis in this document the SAP announcement is the equivalent 
of the electronic program guide, since both are essentially a matter of 
acquisition of static data prior to the actual usage of that data. The 
strategy for dealing with the transition issues presented by 
session-level signalling may differ because of the latter's more dynamic 
nature."
>
> Also, it isn't impossible to decide how the transformation should be
> done until we have agreed on the mapping strategy.

[PTT] It's not as if the document comes to any conclusion as yet.
>
> Ron /speaking as individual contributor
>
...