From: Tarun Pahuja (pahujat@gmail.com)
Date: Thu Jun 14 2007 - 03:50:04 ART
John,
WRED combines the capabilities of the RED algorithm with IP
Precedence to provide for preferential traffic handling of higher priority
packets. WRED can selectively discard lower priority traffic when the
interface begins to get congested and provide differentiated performance
characteristics for different classes of service.
HTH,
Tarun
On 6/14/07, johngibson1541@yahoo.com <johngibson1541@yahoo.com> wrote:
>
> RED alone offers performance improvements already right?
>
> If all TCP connections are equally important, RED still
> improves things. WRED offers nothing in addition, right?
>
> WRED's purpose should be analyzed as 2 parts right?
>
> 1. Just scrambling the peaks and valleys among TCP's
> slow start and back down mechanism improves throughput.
>
> 1.1 This RED alone can do.
>
> 1.2 This needs some random process math to understand.
>
> 2. The weighting part prevents "undiscriminating drop"
>
> 2.1 We love to prevent this.
>
> 2.2 This is plain information everyone understands.
>
> John
>
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-- Tarun Pahuja CCIE#7707(R&S,Security,SP,Voice,Storage),CCSI
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