From: Jonathan V Hays (jhays@jtan.com)
Date: Wed Jun 25 2003 - 18:30:14 GMT-3
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of John Humphrey
> Sent: Wednesday, June 25, 2003 5:03 PM
> To: ccielab@groupstudy.com
> Subject: QoS: CQ question
>
>
> Posted this before but didn't get a response, so here I go again :)
>
> After reading the following CCO Doc:
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios12
> 2/122cgcr/fq
> os_c/fqcprt2/qcfconmg.htm#1001336
>
> you will see the following special note that seems to negate
> the need to
> do all the normalize, divide, multipy stuff. The doc reads
>
> " CQ was modified in Cisco IOS Release 12.1. When the queue
> is depleted
> early, or the last packet from the queue does not exactly match the
> configured byte count, the amount of deficit is remembered
> and accounted
> for the next time the queue is serviced. Beginning with Cisco
> IOS Release
> 12.1, you need not be as accurate in specifying byte counts as you did
> when using earlier Cisco IOS releases that did not take deficit into
> account. "
>
> Does this mean that we can use simple ratios for the byte-count
> calculations? For example, if I need to give three separate
> protocols 33%
> of the bandwidth, can I do "byte-count 500" for all three? It
> seems that
> if the IOS is capable of remembering the byte-count deficit,
> that using
> simple percentages should be OK. Any ideas would be appreciated.
>
> jh
>
Regarding the use of simple ratios, I think the answer would depend on
whether the exam booklet states the packets sizes.
If it does, you had better do the normalize-divide-multiply thing.
Otherwise, you might assume all packets size are the same and get away
with simple ratios.
If it was me, in the absence of a written specification, I would ask the
proctor if I could assume packets sizes are the same for all 3
protocols.
HTH
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