Subject: RE: [Diffserv] Question 1.

From: Shahram Davari <[email-masked]>
Date: Wed, 9 Feb 2000 12:20:16 -0800

Hi,

> -----Original Message-----
> From: Bae Jin Han [mailto:[email-masked]]
> Sent: Wednesday, February 09, 2000 5:51 AM
> To: [email-masked]
> Subject: [Diffserv] Question 1.
> 
> 
> Hi,
> I have questions.
> In current Differentiated Services,
> According to PHB, Interior Node have multiple queues.
> 1. Which is as active buffer management in each queue ? ( rio or red )

This is not specified or enforced by Diffserv WG. You may use any active
queue management that you like.

> If answer  is RIO, What is differentiation RIO with multiple queue or
> WRED
> (Weighted RED) ?

As far as I know in RIO the queue size for each drop precedence consists
only of that type of packets + all lower drop precedence packets, while in
WRED a single queue size which is the actual queue size is used for all drop
precedence. Also WRED uses a value of 2^(-n) for the probability of
dropping.

> 
> 2. Best-effort flows map to Default PHB.
> Then have other queue.
> Which is active buffer management in Default PHB ?
> 
> Regrads,
> - Jin Han
> 
> 

You can use the same RIO or WRED or ... that you use for other queues.

> 
> 
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Regards,
Shahram

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