[c-nsp] How to limit bandwidth on CISCO switch interfaces

[JA Colmenares]

Andy,
When you say "globally", are you referring to Qos on those two involved switches only? 
Juan

--- On Thu, 1/6/11, Andriy Bilous <andriy.bilous at gmail.com> wrote:

From: Andriy Bilous <andriy.bilous at gmail.com>
Subject: Re: [c-nsp] How to limit bandwidth on CISCO switch interfaces
To: "Jens Neu" <jens.neu at biotronik.com>
Cc: "JA Colmenares" <sforcejr at yahoo.com>, "Cisco NSP Forum" <cisco-nsp at puck.nether.net>
Date: Thursday, January 6, 2011, 4:19 AM

That is correct answer, with some hidden side-effects though.
srr-queue bandwidth limit requires mls qos to be enabled globally. mls
qos by default places queue 1 on ALL egress ports in shaped mode and
reserves 1/25 * interface bandwidth = 4Mb/s on the 100Mb/s interface.
Shaped queue does NOT shrink with bandwidth limit configured for the
interface like one would expect. You either need to reassign weight,
as shaping value is always calculated relative to physical bandwidth,
or eliminate shaping all together.

On Thu, Jan 6, 2011 at 9:54 AM, Jens Neu <jens.neu at biotronik.com> wrote:
> You are probalby looking for this:
> http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_see/configuration/guide/swqos.html#wp1253412
>
> regards
> Jens Neu
> Health Services Network Administration
>
> Phone: +49 (0) 30 68905-2412
> Mail: jens.neu at biotronik.de
>
>
>
> From:
> JA Colmenares <sforcejr at yahoo.com>
> To:
> Cisco NSP Forum <cisco-nsp at puck.nether.net>
> Date:
> 01/06/2011 06:00 AM
> Subject:
> [c-nsp] How to limit bandwidth on CISCO switch interfaces
> Sent by:
> cisco-nsp-bounces at puck.nether.net
>
>
>
>
>
> I need to limit bandwidth on the trunk ports of two connected
> switches(2960 to 3750). It is currently transmitting at 100 mbps and I
> want to limit it to 50 mbps How can this be done? can anyone provide any
> steps or resources to get this done.
> Thanks
> Juan
>
>
>
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