From: Peng Zheng (zpnist@yahoo.com)
Date: Mon Aug 11 2003 - 03:59:37 GMT-3
Thanks. Now I understand what they mean.
--- "Snow, Tim" <timothy.snow@eds.com> wrote:
> It means at exactly the maximum threshold. Not over
> or not under. I
> understand it's highly unlikely that the queue will
> ever be at exactly the
> the max threshold but that's how they've wrote it.
>
> From the link
>
> When the average queue depth is above the minimum
> threshold, RED starts
> dropping packets. The rate of packet drop increases
> linearly as the average
> queue size increases until the average queue size
> reaches the maximum
> threshold.
>
> The mark probability denominator is the fraction of
> packets dropped when the
> average queue depth is at the maximum threshold. For
> example, if the
> denominator is 512, one out of every 512 packets is
> dropped when the average
> queue is at the maximum threshold.
>
>
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos
> _c/fqcprt3/qcfconav.htm#1000915
>
>
> Tim
> #12042
>
> -----Original Message-----
> From: Peng Zheng [mailto:zpnist@yahoo.com]
> Sent: Monday, August 11, 2003 2:45 AM
> To: ccielab@groupstudy.com
> Subject: Which one is correct for WRED?
>
>
> In
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/qos_r
> /qrcmdr.htm#1017566
>
> It's said:
>
> mark-prob-denominator
>
> Denominator for the fraction of packets dropped
> when
> the average queue depth is at the maximum threshold.
> For example, if the denominator is 512, one out of
> every 512 packets is dropped when the average queue
> is
> at the maximum threshold. The value range is 1 to
> 65536. The default is 10; one out of every ten
> packets
> is dropped at the maximum threshold.
>
> What's "at the maximum threshold" mean? Does it
> mean
> over maximum threshold or between minimum threshold
> and maximum threshold?
>
>
>
>
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