Re: 3650 COS/DSCP to queue mapping

Cool.
Supporting Anthony's observation, from
http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSCampus_40.html#wp1099462

     Note: CoS-to-queue mappings are only required if some switch ports
     are configured to trust-CoS on ingress.

Anthony Sequeira @ 30/08/2012 11:45 -0300 dixit:
> Hi Matt!
>
> What an AWESOME question. While the documentation does not make it clear,
> the value that you trust on ingress, in your example, CoS, is the marking
> that is used in the appropriate default queue mapping table on the egress
> port.
>
> Anthony Sequeira, CCIE, CCSI, VCP
> http://www.stormwind.com
> Twitter: @compsolv
> Facebook: http://www.facebook.com/compsolv
>
>
>
> On 8/29/12 9:11 PM, "Matt Eason" <matt.d.eason_at_gmail.com> wrote:
>
>> Hi Guys,
>>
>>
>>
>> Can you help clarify the following. If I have a switchport configured on a
>> 3560 to trust CoS inbound, that cos value is then mapped to an internal
>> DSCP value via the COS>DSCP map. Thats fine.
>>
>>
>>
>> Does this switch then determine the output queue from the original CoS
>> value or the internal DSCP value which was assigned by the switch? I see
>> both a DSCP>Output queue map and a COS>Output queue map exists.
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Matt
>>
>>
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