[c-nsp] ME3750 Shaping

[Arie Vayner (avayner)]

Eric,

Take a 2nd look here:
http://www.cisco.com/en/US/docs/switches/metro/catalyst3750m/software/re
lease/12.2_46_se/configuration/guide/swqos.html#wp1282429

Arie 

-----Original Message-----
From: Eric Van Tol [mailto:eric at atlantech.net] 
Sent: Friday, September 12, 2008 22:30 PM
To: Arie Vayner (avayner); cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] ME3750 Shaping

> From: Arie Vayner (avayner) [mailto:avayner at cisco.com]
>
> Eric,
>
> This should be possible.
> Take a look here:
> http://www.cisco.com/en/US/docs/switches/metro/catalyst3750m/software/
> re lease/12.2_46_se/configuration/guide/swqos.html
>
> Arie

Hi Arie,
Thanks for the response.  I've read this a bunch of times and it seems
to me that the proper (and possibly only?) way to do egress shaping is
by using the 'srr-queue bandwidth shape' command, which gives you
options to set different weights for the queues.  The formula for the
weights indicates that the weight is a fractional number of the total
amount of bandwidth for the port.  For a 100M port, a weight of 8 would
equal 12.5 percent, or 12.5Mb/s.  So, using that formula, if I want to
get 50Mb/s shaping on a queue, I use 2 as the number.  What about
75Mb/s, or even something else between 50M and 99M?  I can't use a
floating point, so it looks like I'm pretty much stuck at 1/2 of the
bandwidth of the port.

Or am I misunderstanding the srr-queue settings entirely (which could
certainly be the case)?

Thanks,
evt