From: Re-act (wantingfeng@hotmail.com)
Date: Fri May 23 2003 - 13:45:09 GMT-3
Hi, Jonathan
Thanks,but I read the QOS document CD, it said that WRED is used on congestion avoidance, and queue is used when congestion occur, if congestion not occur, the queue isn't useful. also, WRED is very useful on solution TCP gloable syncronization. and here metioned "on R1 the load wat not full", so I suspition on R1,there happened TCP gloable syncronization, pls give me directions,thx!
----- Original Message -----
From: "Jonathan V Hays" <jhays@jtan.com>
To: <ccielab@groupstudy.com>
Cc: "'Re-act'" <wantingfeng@hotmail.com>
Sent: Friday, May 23, 2003 9:06 PM
Subject: RE: A QOS question
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of Re-act
> > Sent: Friday, May 23, 2003 5:55 AM
> > To: ccielab@groupstudy.com
> > Subject: A QOS question
> >
> >
> > If anyone would help me?
> >
> > clients--(f0/0)R1(s0/0)---FR----(s0/0)R2(f1/0)----server
> >
> > when clients access web and ftp on server,they find the speed
> > is very slow,and sometimes ftp would be disconnected,but on
> > R1 the load was not full,pls give a solution.use PQ or WRED,or FRTS?
> >
> >
>
>
> Unless the question supplied more information on CIR, access rates on
> the interfaces, and so forth, I would eliminate FRTS as a solution
> choice. Additionally, FRTS focuses more on link traffic rates and the
> statement "on R1 the load was not full" implies this is not the problem.
> Similarly, WRED is also aimed at traffic rate congestion problems
> (congestion avoidance).
>
> So my guess is Priority Queueing, if this is a multiple choice question.
> If you have other options, take a look at Custom Queueing, WFQ, and
> other congestion avoidance solutions.
>
> Reading the Doc CD's "Quality of Service Overview" would probably help
> you here because it will give you an overview of what each type of QOS
> tool accomplishes.
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
> qos_c/qcdintro.htm
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