From: Pavel Bykov (slidersv@gmail.com)
Date: Tue Dec 16 2008 - 14:52:22 ARST
Paul, thanks for the links.
But as I mentioned before: the "max-reserved-bandwidth" command never
worked.
If you look at part 6 of my testing, I used a quite old T release (2 years
old at least) and still the result points out, that class-default didn't get
promised 25%.
On Tue, Dec 16, 2008 at 10:25 AM, paul cosgrove <paul.cosgrove@gmail.com>wrote:
> Hi Pavel,
>
> Judging from the docs the functionality of max-reserved-bandwidth changed
> quite a lot in recent releases - as of 12.2(20)T is is no longer supported.
>
> http://ciscosystems.com/en/US/docs/ios/qos/command/reference/qos_m1.html#wp1037779
> This release introduced HFQ and standardised QoS behaviour across the
> platforms. Incidentaly it also seems to have removed fast switching.
>
> There is a good document on the cisco site which explains the recent QoS
> changes. It was written about the service provider track but references
> 12.4T where the changes seem to have been introduced a little later.
>
> http://www.cisco.com/en/US/technologies/tk543/tk545/technologies_white_paper0900aecd8012032d.html
>
> The following is an extract from the doc:-
>
> Max-Reserved-Bandwidth
>
> Old Behavior
> The default maximum reserved bandwidth is 75 percent, so the maximum
> bandwidth that can be guaranteed to any user-defined class is also 75
> percent. If 75 percent of the bandwidth is allocated only for the LLQ, then
> no minimum bandwidth can be guaranteed to the other classes, and they will
> share the remaining 25 percent bandwidth with the class default traffic.
> If more bandwidth needs to be allocated, use the max-reserved-bandwidthcommand to modify the bandwidth amount that can be reserved for user-defined
> classes.
>
> New Behavior
> The max-reserved-bandwidth command no longer affects the amount of
> bandwidth available to a service-policy. 1% must be reserved for the
> class-default with the rest being available to the users classes. Please
> also refer to the previous section "Allocation of Bandwidth to Class
> Default.
>
>
> Paul.
>
>
>
> On Mon, Dec 8, 2008 at 10:01 AM, Pavel Bykov <slidersv@gmail.com> wrote:
>
>> Thanks.
>> Functionality of max-reserved-bandwidth did change with latest IOS, but
>> not
>> by much.
>> You can see this in part 6 of tests on page 22 where testing was done with
>> an old IOS. There R2 and R3 which were in class-default should have gotten
>> at least something, because the command was set at "max-reserved-bandwidth
>> 75", but they didn't and what they got was below 1%.
>>
>>
>> On Sun, Dec 7, 2008 at 1:05 PM, <mihai.grigore@onlinehome.de> wrote:
>>
>> > Pavel,
>> >
>> > I started all this from a statement written some time ago. This might
>> have
>> > been
>> > true at the time of writing Doyle's book. In the meantime, Cisco has
>> > apparently
>> > changed how class-default works and that statement appears to be no
>> longer
>> > valid.
>> >
>> > Thank you for your tests and clarifications, you did a great job with
>> your
>> > tests!
>> > I read the pdf that you put on your server. Very thorough testing!!!
>> > Basically you conclusion is that max-reserved-bandwidth command is kind
>> of
>> > useless.
>> >
>> > It looks like indeed that Cisco has changed the way how
>> > max-reserved-bandwidth
>> > command works and it will take some time to update the documentation, as
>> > usual.
>> >
>> > Many thanks again for your tests!
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> > _______________________________________________________________________
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>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>> --
>> Pavel Bykov
>> ----------------
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>>
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>>
>> _______________________________________________________________________
>> Subscription information may be found at:
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>>
>>
>>
>>
>>
>>
>>
>>
>
-- Pavel Bykov ---------------- Don't forget to help stopping the braindumps, use of which reduces value of your certifications. Sign the petition at http://www.stopbraindumps.com/Blogs and organic groups at http://www.ccie.net
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