[ns] cbq in diffserv

[Alexander Sayenko]

Hi

CBWFQ, which stands for the Class-Based Weighted Fair Queuing, is the term
invented in Cisco laboratories and used in books. In practice, it is the
same WFQ in which sessions correspond to _classes_ or _aggregates_, not to
the distinctive flows. So, if you need WFQ in diffserv in ns-2, here is the
link:

http://www.cc.jyu.fi/~sayenko/src/diffserv_wfq.diff

Sincerely,
Sayenko Alexander
Assistant
Telecommunication laboratory, MIT department
University of Jyvaskyla, Finland

Hi

I have done some searchs and found the existence of a scheduling mechanism
named CBWFQ. It seems to be good for DiffServ with class based.

There is the same problem related to hierarchical link sharing like CBQ, or
other limitation?

Already exists an implementation to ns-2? If yes, where I can find it?


Thanks,
Ricardo Santos




-----Original Message-----
From: ns-users-bounces at ISI.EDU [mailto:ns-users-bounces at ISI.EDU] On Behalf
Of Alexander Sayenko
Sent: terça-feira, 13 de Setembro de 2005 7:32
To: mohamed yahia; ns-users at ISI.EDU
Subject: Re: [ns] cbq in diffserv


Hi

There is no sense in implementing CBQ for DiffServ. CBQ aims to perform the
hirarchical link sharing, in which high levels correspond to the
organizations (departments, and so on), and lower levels correspond to some
services. The DiffServ abstracts from it by introducing PHBs. Another reason
not to implement CBQ for DiffServ is the complexity of the former. The
DiffServ framework relies upon the simple and fast scheduling mechanisms,
such as FCFS, PQ, WRR/DRR, SCFQ.

Sincerely,
Sayenko Alexander
PhD student
Telecommunication laboratory, MIT department
University of Jyvaskyla, Finland


>
> Hi all
> I need to implement diffesrv using CBQ. I am stack in using EF, AF and
> BE traffic. could anyone give a link or hints how to do this.
> with best regards
> Yahia
>
>
>
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