From: Hobbs (deadheadblues@gmail.com)
Date: Wed Sep 24 2008 - 12:56:47 ART
DOH! I didn't even realize I had shaped instead of share. that would
explain it. Thanks Petr. Those are some excellent blogs on 3550/3560 qos.
It' my most difficult, but probably my favorite topic.
On Wed, Sep 24, 2008 at 9:32 AM, Petr Lapukhov
<petr@internetworkexpert.com>wrote:
> Hi,
>
> The issue is related to the fact the the sum of "inverse" absolute weights
> could not be above 1 for shaped mode. In the blog post, I was configuring
> SRR "shared" mode weights "33 33 33 1" which is perfectly legal, since the
> SRR uses them as relative values. In your case, the sum of
> "1/1+1/33+1/33+1/33" exceeds 1, and thus the scheduler may not calculate the
> correct shaping weights. Remember that by setting SRR shaped weight to "1"
> you essentially shape the queue to full interface bandwidth (1/1=1).
> --
> Petr Lapukhov, CCIE #16379 (R&S/Security/SP/Voice)
> petr@internetworkexpert.com
>
> Internetwork Expert, Inc.
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>
> 2008/9/24 Hobbs <deadheadblues@gmail.com>
>
>> Hi,
>>
>> I was following this excellent blog here:
>>
>>
>> http://blog.internetworkexpert.com/2008/06/26/quick-notes-on-the-3560-egress-queuing/
>>
>> but I get a weird error when configuring the "share" parameters:
>>
>> cat2(config-if)#srr-queue bandwidth shape 33 33 33 1
>> The total bandwidth exceeds 1, Please choose new value
>> QoS: cannot set queue into shaping mode
>>
>> I can set it to 0 or any other number except 1:
>>
>> cat2(config-if)#srr-queue bandwidth shape 33 33 33 0
>> cat2(config-if)#srr-queue bandwidth shape 33 33 33 2
>> cat2(config-if)#srr-queue bandwidth shape 33 33 33 3
>> cat2(config-if)#srr-queue bandwidth shape 33 33 33 43
>> cat2(config-if)#srr-queue bandwidth shape 33 33 33 1
>> The total bandwidth exceeds 1, Please choose new value
>> QoS: cannot set queue into shaping mode
>>
>> Anyways I cleared the config, started over and now it works....any ideas
>> what that error meant?
>>
>>
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>>
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