[Dime] MIP6 NAS-HAAA issue #1

[<jouni.korhonen at teliasonera.com>]

About the issue #1 presented during the Dime WG meeting. If
the ASP/NAS needs to send or the MSA needs to return more than
one HA information the current AVP formulation does not work.
This is because we have defined AVP counts as "at most one".
Furthermore, if we are about to allow "zero or more" AVPs we
need to have a way to group HA address, FQDN, home link prefix
etc together. For that purpose a grouped AVP would be OK.

So the question is (also related to the issue #2) whether 
"zero or more" HAs must be supported. At least the recent
discussion in MIP6 list points to this direction.

Anyway, my personal opinion is that defining a grouped AVP
does-no-harm anyway. Below is one proposal for a grouped AVP:

  MIP6-Info ::= < AVP Header: 297 >
                [ MIP6-Home-Agent-Address ]
                [ MIP6-Home-Agent-FQDN ]
                [ MIP6-Home-Link-Prefix ]
                [ MIP6-Home-Address ]
                ...

Any opinions?

Cheers,
	Jouni

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