From: Ash (nester2k@gmail.com)
Date: Wed Feb 21 2007 - 23:53:29 ART
Hi Derick,
From a technical standpoint, WFQ+RED isnt the same as FRED. Reason is, in
WFQ if you dont have enuff queues allowed on an interface, multiple flows
having the same IPP/DSCP values will be enqueued in the same queue. When the
queue starts to fill up, RED will start dropping packets randomly/equally
regardless of the size of the individual flows.
FRED on the other hand in an above mentioned situation will still consider
the IPP/DSCP as well the flow size. Flows with more packets will be
dropped dropped more agressivley than the flows with less packets.
hope that helps
On 2/21/07, Derick Winkworth <dwinkworth@wi.rr.com> wrote:
>
> All:
>
> Anyone know exactly how RED and FQ work together? They are commonly
> placed
> together in the default class of a policy-map.
>
> Each flow gets a queue through FQ right? A conversation hash I think its
> called. Is RED performed on each individual flow queue? Or is there a
> second
> queue (like a FIFO queue) after the FQ mechanism?
>
> One idea is that the two of them together is the same thing as Flow based
> WRED...
>
> Thoughts?
>
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