From: Dmitry Volkov (dmitry.volkov@rogers.com)
Date: Wed Aug 25 2004 - 19:44:10 GMT-3
Oops I stand corrected.
class-default takes 25 together with control and L2 keepalives
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuratio
n_guide_chapter09186a00800b75a9.html#1001225
-----Original Message-----
From: mani poopal [mailto:mani_ccie@yahoo.com]
Sent: Wednesday, August 25, 2004 5:45 PM
To: dmitry.volkov@rogers.com
Subject: [Bulk] RE: (config-if)#max-reserved-bandwidth 70
Hi Dmitry,
Since all other quees aro 70% of bandwidth and default for default class
is 25% of configured bandwidth on the link, by configuring this command I
think default-class will be assigned a 30%. Others pls input your
information
Mani
Dmitry Volkov <dmitry.volkov@rogers.com> wrote:
I believe in this particular case default class will take 5%
because all classes (including default) on low end platforms <7500
can take (by default) no more than 75% of bandwidth (max reserved-band
can
change it)
since 70% assigned to 3 classes - only 5 % left for default
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On
> Behalf Of Carlos G Mendioroz
> Sent: Wednesday, August 25, 2004 5:56 AM
> To: gladston@br.ibm.com
> Cc: ccielab@groupstudy.com; mani_ccie@yahoo.com
> Subject: Re: (config-if)#max-reserved-bandwidth 70
>
>
> I don't know if this is usefull for the exam, but accoring to some
> information from cisco, the problem is not that easy...
> First of all, bandwidths are calculated at layer 3, where real things
> happen at layer 2. Also, some control stuff works out of the thing.
> This is where (AFAIK) the 25% started.
>
> The second issue that complicates matters is that there is an
> implicit
> prioritization of traffic queues in 3 levels. All priority queues go
> first, but they are also policed, so no starving is possible
> (as long as
> reasonable numbers are configured).
> All defined classes with bandwidth go second. Class default goes last.
> Oops, no policing is enforced at the standard classes! So starving of
> class default is by all means possible (unless we shift it to
> the second
> level by explicitly assigning a bandwidth).
>
> This all depends on having enough traffic fed to the router of each
> class, as this assignments are dynamic, and no reservation occur.
>
> gladston@br.ibm.com wrote:
>
> > Let me try it.
> > Class-default will get 25% of the bandwidth if we do not
> specify a value for it.
> > If there is congestion, the remaining bandwidth (not
> assigned to any class) will be shared according to the weight
> of each class.
> >
> > ===========
> > quoted
> > Assume link bw=128kbps and you have 3 classes and assigned
> a total bandwidth
> > of 70%(128kbps*0.7=89.6=90kbps)class 1 bandwidh=10kbps, class 2
> > bandwidth=35kbps, class 3 bandwidth=25kbps. What will the
> bandwidth assigned
> > to default-class, is it still 25% of the link bandwidth(32
> kbps) or remaining
> > bandwidth(38kbps=128kbps-90kbps).
> >
> > Or else do we need a comand like below to specify to use
> class-defalt
> > bandwidth to the remaining 30% instead of default 25%:
> > (config-if)#max-reserved-bandwidth 70<--this number is less
> than the default
> > number(75%)
> > ==============
> >
> >
> ______________________________________________________________
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>
> --
> Carlos G Mendioroz LW7 EQI Argentina
>
> ______________________________________________________________
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