RE: [Dime] MIP6 NAS-HAAA issue #1

[Madjid Nakhjiri <mnakhjiri at huawei.com>]

Hi Jouni,

I have no problem with the general idea of grouped AVP, only a few notes
regarding the construct:

1) calling the AVP MIP6-Info may be a bit problematic, basically you are
putting the entire MIP6 application info into one grouped AVP? Will we then
be able to define this group AVP in a way that any possible AVP people come
up with to support MIP6 can easily be integrated in this AVP? If yes, then
no problem. 

Right now, I can have an idea about a couple of things that can be MIP6-info
related AVPs and are not shown below. Just call it MIP6_HA_info (leave HOA
out of it, IMO) or call it MIP6_ADDR_info and leave HOA in.

2) Not debating whether or not we should send multiple HA info together, The
suggested construct does not show how many HAs there are in the AVP. I would
guess you would need something to indicate that.

Hope this helps,

Madjid

-----Original Message-----
From: jouni.korhonen at teliasonera.com [mailto:jouni.korhonen at teliasonera.com]

Sent: Thursday, March 22, 2007 5:38 AM
To: dime at ietf.org
Subject: [Dime] MIP6 NAS-HAAA issue #1


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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