Hi
I'm responding here with my personal view, and hopefully also the same
as I was saying in the meeting.
On 4/10/2013 12:49 AM, LUIS MIGUEL CONTRERAS MURILLO wrote:
Dear all,
After the Orlando meeting discussions on the flag A mechanism described
in draft-ietf-multimob-handover-optimization-02 for mitigating the
internal signaling within the network in case of reactive handover, we
would like to consult WG members about your preference:
Option 1.- To include the flag A mechanism as an integral (and
mandatory) part of the solution, as described in the draft today.
Option 2.- To consider the flag A mechanism as an option to reduce
signaling in the core, then removing the reference to this mechanism
from the draft. The final document would consider that the LMA always
queries the pMAG by default, but mentioning that some mechanism
(out-of-scope) could be used to reduce this signaling (by avoiding to
query the pMAG).
Wouldn't a 3rd option be to keep it in the draft, but not make the A
flag mandatory to implement/enable? I think that may require additional
work though, because you may need to know whether the A flag is being
used. Basically you need to know that A flag not set, doesn't mean that
there is no subscription when A-flag support isn't enabled.
My concern is that the A-flag mechanism may not be worth the effort, or
even worse, if clients often switch between having multicast
subscriptions and not (basically that A is frequently often updated).
If the A flag is mostly stable, then I think it is useful.
So at least my thinking is that unless we know with some certainty what
the usage pattern is, then it is better to make it optional. If we agree
on making it optional, then the question is whether we still want it in
this document (option 2 or 3).
Hope we can get the input of several people in the group and try to
figure out what the best option is.
Stig
Thanks in advance,
Best regards,
Luis
________________________________
Luis M. Contreras
Technology / Global CTO / Telefónica
Efficiency Projects / Telefónica I+D
Distrito Telefónica, Edificio Sur 3, Planta 3
28050 Madrid
España / Spain
[email protected]
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