Re: mls qos map cos-dscp

*The output of the following show commands displays the default DSCP to CoS
mapping, it means that IF the "MLS QOS" and Mls qos trust dscp command is
configured, then, the DSCP marking of incoming packets are mapped to
outgoing CoS values according to the DSCP-CoS map.*

* *

*The incoming DSCP values are shown in the d1 column and the d2 row,
whereas, the outgoing CoS values are identified in the body of this display,
this is the intersection of d1 column and d2 row.*

*Therefore, I agree with Bob, DSCP 10 will map to an outgoing CoS value of
1, whereas, the DSCP value of 40 will map to a **CoS** value of 5.*

* *

*But remember unlike DSCP-DSCP mapping that can be applied to a given
interface, this table effects the entire switch.*

*SW2#Sh mls qos map dscp-cos*

   Dscp-cos map:

     d1 : d2 0 1 2 3 4 5 6 7 8 9 *Note by
default DSCP 10 maps to **CoS***

     ---------------------------------------------- *1*

      0 : 00 00 00 00 00 00 00 00 01 01

      1 : *01* 01 01 01 01 01 02 02 02 02

      2 : 02 02 02 02 03 03 03 03 03 03

      3 : 03 03 04 04 04 04 04 04 04 04

      4 : 05 05 05 05 05 05 05 05 06 06

      5 : 06 06 06 06 06 06 07 07 07 07

      6 : 07 07 07 07

*SW2#Sh mls qos map dscp-cos*

   Dscp-cos map:

     d1 : d2 0 1 2 3 4 5 6 7 8 9 *Note by
default DSCP 40 maps to **CoS***

     ---------------------------------------------- *5*

      0 : 00 00 00 00 00 00 00 00 01 01

      1 : 01 01 01 01 01 01 02 02 02 02

      2 : 02 02 02 02 03 03 03 03 03 03

      3 : 03 03 04 04 04 04 04 04 04 04

      4 : *05* 05 05 05 05 05 05 05 06 06

      5 : 06 06 06 06 06 06 07 07 07 07

      6 : 07 07 07 07

*
*

On Sun, Aug 29, 2010 at 7:09 PM, Bob Sinclair <bob_at_bobsinclair.net> wrote:

> Hello Emir,
>
> Your DSCP values will be mapped to CoS values based on the dscp-cos map.
> Here is the default dscp-cos map on a current 3560:
>
>
> SW1#sh mls qos map dscp-cos
> Dscp-cos map:
> d1 : d2 0 1 2 3 4 5 6 7 8 9
> ---------------------------------------
> 0 : 00 00 00 00 00 00 00 00 01 01
> 1 : 01 01 01 01 01 01 02 02 02 02
> 2 : 02 02 02 02 03 03 03 03 03 03
> 3 : 03 03 04 04 04 04 04 04 04 04
> 4 : 05 05 05 05 05 05 05 05 06 06
> 5 : 06 06 06 06 06 06 07 07 07 07
> 6 : 07 07 07 07
>
>
> SW1#
>
>
> Note that is simply divides the dscp value by 8 throws away the remainder.
>
> So dscp 10 would map to cos 01 and dscp 40 would map to 05.
>
> HTH,
>
> Bob Sinclair CCIE 10427 CCSI 30427
> CIERS2 Online Instructor
> www.tinyurl.com/ciers2online
>
> > -----Original Message-----
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> > emir d souza
> > Sent: Sunday, August 29, 2010 9:48 PM
> > To: Cisco certification
> > Subject: mls qos map cos-dscp
> >
> > Hi,
> >
> > I'm a bit confused. My 3560 has this set: mls qos map cos-dscp 0 8 16
> > 24 34
> > 46 48 56
> >
> > Question: What if I have set dscp markings for DSCP 10 or 40? What CoS
> > values will they be mapping to?
> >
> > Regards,
> >
> > emir
> >
> >
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> > 08/29/10 14:34:00
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Narbik Kocharians
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