From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Jul 23 2004 - 16:50:00 GMT-3
John,
You would normally want to shape. Shaping allows your traffic a
second chance to be sent before it is dropped, and avoids having to
retransmit. Ultimately it depends on the specific network requirements
(i.e. voice or data, etc), but in the context of the lab if you are
trying to "conform to a provisioned rate" you would want to shape.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> John Matus
> Sent: Thursday, July 22, 2004 5:57 PM
> To: Baety Wayne A 30 SIG BN RS3 (cn); lab
> Subject: Re: police vs. shape peak
>
> RE: police vs. shape peak...but if you want traffic to "conform" to a
> provisioned rate, which option would be the one, or would both satisfy
> such a
> requirement?
>
> Regards,
>
> John D. Matus
> MCSE, CCNP
> 818.782.2061 office
> 818.430.8372 mobile
> jmatus@pacbell.net
>
>
> ----- Original Message -----
> From: Baety Wayne A 30 SIG BN RS3 (cn)
> To: 'John Matus' ; lab
> Sent: Thursday, July 22, 2004 3:56 PM
> Subject: RE: police vs. shape peak
>
>
>
>
> (1) Police absolutely keeps the traffic rate at a maximum of the
> configured
> rate, by simply dropping packets that exceed the configured rate (or
> reclassifying excess packets so that they can later be processed for
> dropping).
>
> (2) Shape portions traffic exceeding the configured rate for later
> transmission, queuing the excess traffic, and finally dropping traffic
> that
> overflows the output buffers.
>
> At points of high constant transmission, shape and police are
identical
> in
> operation, dropping excess packets.
>
> However, since most traffic is bursty in nature, with peaks and
valleys
> in
> the traffic rate in relation to the configured rate, shape will defer
> excess
> traffic exceeding the peak rate (each packet sent in each time slice
> exceeding
> the configured byte count) to points of transmission below the
configured
> rate
> (time slices in which the byte count quota has not yet been reached).
>
> In both cases, although the packet classifier has a bitwise
precision
> level,
> never are packets chopped up and sent to satisfy a requirement. Whole
> packets
> are either queued (in the case of shaping) or dropped (in the case of
> policing).
>
> Ref: http://www.cisco.com/warp/public/105/policevsshape.html
>
>
>
> WAYNE A. BAETY, Contr, 30SIG BN
> MCSE+I, MCSD, MCDBA, CCNP+Voice
> Resident System Support Specialist
> Office: (808) 655-6761
> Cell: (808) 779-3776
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> John
> Matus
> Sent: Thursday, July 22, 2004 11:59 AM
> To: lab
> Subject: police vs. shape peak
>
> if you have a limit on the amount of traffic that you can
send.....or,
> the
> traffice must "conform" to a certain rate.......would you use
>
> policy-map null
> class class-default
> police 250000
>
> or
>
> policy-map null
> class class-defualt
> shape peak 250000
>
> what would be the difference??
>
> Regards,
>
> John D. Matus
> MCSE, CCNP
> 818.782.2061 office
> 818.430.8372 mobile
> jmatus@pacbell.net
>
>
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