Re: show mls qos

We had 7609 as PE and 4948 in between CE .. We didn't enable mls qos ... On CE we were not able to see marked packets

BR// Prakash Kalsaria
Sent on my BlackBerry.

-----Original Message-----
From: Carlos G Mendioroz <tron_at_huapi.ba.ar>
Sender: nobody_at_groupstudy.com
Date: Tue, 29 May 2012 19:42:54
To: marc edwards<renorider_at_gmail.com>
Reply-To: Carlos G Mendioroz <tron_at_huapi.ba.ar>
Cc: emir d souza<emir979_at_gmail.com>; Cisco certification<ccielab_at_groupstudy.com>
Subject: Re: show mls qos

I tested this on a 3560 and it does keep COS when possible, i.e., when
output IF is trunking.

-Carlos

marc edwards @ 30/04/2012 10:45 -0300 dixit:
> When no mls QoS globally, frames are forwarded FIFO with no alterations in
> header. That is how I remember it ...
>
> Marc
>
> On Monday, April 30, 2012, Carlos G Mendioroz wrote:
>
>> It's not the same for COS and DSCP.
>> A switch works mainly at L2, so L3's DSCP would pass unnoticed (and
>> unchanged) when QoS is disabled.
>> But COS has to be regenerated along the new frame at L2 (only when there's
>> a COS field to begin with, i.e. usually a trunk).
>>
>> I'm not sure what a switch does there, not even sure all switches do the
>> same. I would suspect they send COS 0.
>>
>> -Carlos
>>
>> marc edwards @ 29/04/2012 20:13 -0300 dixit:
>>
>>> It will ignore markings
>>>
>>> regards,
>>> marc
>>>
>>> On Sun, Apr 29, 2012 at 4:06 PM, emir d souza<emir979_at_gmail.com> wrote:
>>>
>>>> Hi experts,
>>>>
>>>> Will a switch rewrite cos/dscp markings to "zero" if qos has been
>>>> disabled?
>>>> Or does it choose to ignore any markings.
>>>>
>>>> #show mls qos
>>>> QoS is disabled
>>>> QoS ip packet dscp rewrite is enabled
>>>>
>>>> Cheers!
>>>>
>>>>
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>> --
>> Carlos G Mendioroz<tron_at_huapi.ba.ar> LW7 EQI Argentina
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net