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Sup2T ##show platform qos ## command

Unanswered Question
Jan 4th, 2014
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Hi everyone,

The white paper about sup2t System Architecture

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11-652042.html#wp9000594

says:


By default, packets are passed through without a change in DSCP, EXP, or CoS for L2 packets or L2-classified L3 packets

However, when I see the output of the command "show platform qos" there are " CoS Changes"

----- Switch [1], Module [1] -----


                 Counter   IFE Pkts     IFE Bytes    OFE Pkts     OFE Bytes


---------------------------------------------------------------------------


          Policing Drops 0              0              0          0          


       Policing Forwards 1136306595     26171591950357  1150627829 26173991946454


Police-hi Actions (Lvl3) 0              0              0          0          


Police-lo Actions (Lvl2) 0              0              0          0          


         Aggregate Drops 0              0              0          0          


      Aggregate Forwards 1136306593     26171591950221  1150627827 26173991946318


    Aggregate Exceeds-Hi 0              0              0          0          


    Aggregate Exceeds-Lo 0              0              0          0          


                NF Drops 0              0              0          0          


             NF Forwards 2              136            2          136        


              NF Exceeds 0              0              0          0          

                                       TOS Changes 1           


                                        TC Changes 0           


                                       EXP Changes 0           


                                       COS Changes 949932      


                                     Tunnel Decaps 1           


                                     Tunnel Encaps 1  



1. ¿Why there are cos changes?


2. ¿What are Policing Forwards and Aggregate Forwards?


I have two C6500E (Sup2T Supervisor) in VSS mode and my config is quite similar to defaults.


auto qos default


table-map cos-discard-class-map

map from  5 to 46

interface Port-channel10

switchport

platform qos trust cos


interface GigabitEthernet1/1/6

switchport

platform qos trust cos

channel-group 10 mode active

3. ¿Could it be related to CoPP?


Thank you in advance.

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