Subject: RE: [Diffserv] Definition of a BA

From: Shahram Davari <[email-masked]>
Date: Wed, 12 Apr 2000 09:05:23 -0700

Hi,

What if we define a BA that applies to only one DSCP. Then the current
definition of OA can be applied to a group of BAs that uses a PHB group (of
course having the ordering constraints). And we don't need to invent any new
term.

-Shahram 

>-----Original Message-----
>From: Brian E Carpenter [mailto:[email-masked]]
>Sent: Wednesday, April 12, 2000 11:03 AM
>To: Shahram Davari
>Cc: Grenville Armitage; Dan Grossman; [email-masked]
>Subject: Re: [Diffserv] Definition of a BA
>
>
>If that's the question, I think it is for whoever is brave enough to
>draft a BA description for AF to answer. If the answer is no,
>it means that the aggregate behaviour of AF can't be described.
>
>   Brian
>
>Shahram Davari wrote:
>> 
>> Brian,
>> 
>> I think Grenville's question was why packet's with different 
>DSCPs that
>> indicate a PHB group are part of a single BA? For example assume
>> AF11=>DSCP1, AF12=>DSCP2 and AF13=>DSCP3, now if we have 
>packets with DSCP1,
>> DSCP2, DSCP3, are they part of a single BA? or they belong to 3 BAs?
>> 
>> Regards,
>> -Shahram
>> 
>> >-----Original Message-----
>> >From: Brian E Carpenter [mailto:[email-masked]]
>> >Sent: Wednesday, April 12, 2000 9:55 AM
>> >To: Grenville Armitage
>> >Cc: Dan Grossman; [email-masked]
>> >Subject: Re: [Diffserv] Definition of a BA
>> >
>> >
>> >Grenville,
>> >
>> >Grenville Armitage wrote:
>> >...
>> >> Hmmm... perhaps my head is still flushing the opposite 
>way after the
>> >> IETF, but can you remind me why must we presume that packets in a
>> >> PHB Group are part of the same BA?  (Or is this tied up with the
>> >> impending re-definition of BA?)
>> >
>> >A BA classifier only looks at the DSCP, so a BA classifier cannot
>> >discriminate between hypothetically different "BAs" whose
>> >packets carry
>> >the same DSCP. Since we want interior routers to be able to use BA
>> >classifiers, it follows that at a given interior router interface,
>> >all packets belonging to a given PHB Group are in the same BA.
>> >
>> >   Brian
>> >
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>> >
>> 
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