Re: 3560 error: The total bandwidth exceeds 1, Please choose

From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Wed Sep 24 2008 - 12:32:54 ART

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.
http://www.InternetworkExpert.com
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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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