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Silver

COS or DSCP

                   hi there,

where we should use auto qos trust cos and where to use auto qos trust dscp.

we had some issues in our network where we can see any cos incoming trrafic in cos 5 but we can see in cos 6 same with outgoing .

which one is right comand to use on uplinks with router and which one is to use with switch uplink.

#sh mls qos int g0/1 statistics
GigabitEthernet0/1 (All statistics are in packets)

  dscp: incoming
-------------------------------

  0 -  4 :       66471            0            0            0            0
  5 -  9 :           0            0            0            0            0
10 - 14 :           0            0            0            0            0
15 - 19 :           0            0            0            0            0
20 - 24 :           0            0            0            0         2064
25 - 29 :           0           20            0            0            0
30 - 34 :           0            0            0            0            0
35 - 39 :           0            0            0            0            0
40 - 44 :           0            0            0            0            0
45 - 49 :           0         3060            0            0            0
50 - 54 :           0            0            0            0            0
55 - 59 :           0            0            0            0            0
60 - 64 :           0            0            0            0
  dscp: outgoing
-------------------------------

  0 -  4 :       64384            0            0            0            0
  5 -  9 :           0            0            0           90            0
10 - 14 :           0            0            0            0            0
15 - 19 :           0            0            0            0            0
20 - 24 :           0            0            0            0         2712
25 - 29 :           0            0            0            0            0
30 - 34 :           0            0            0            0            0
35 - 39 :           0            0            0            0            0
40 - 44 :           0            0            0            0            0
45 - 49 :           0            0            0          995            0
50 - 54 :           0            0            0            0            0
55 - 59 :           0            0            0            0            0
60 - 64 :           0            0            0            0
  cos: incoming
-------------------------------

  0 -  4 :       67404            0            0         2084            0
  5 -  7 :           0         3060            0
  cos: outgoing
-------------------------------

  0 -  4 :       65088           90            0         2712            0
  5 -  7 :           0          995            0
  output queues enqueued:
queue:    threshold1   threshold2   threshold3
-----------------------------------------------
queue 0:           0           0           0
queue 1:           0        3327       11775
queue 2:           0           0       64483
queue 3:          90           0           2

  output queues dropped:
queue:    threshold1   threshold2   threshold3
-----------------------------------------------
queue 0:           0           0           0
queue 1:           0           0           0
queue 2:           0           0           0
queue 3:           0           0           0

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3 REPLIES
Hall of Fame Super Silver

Re: COS or DSCP

In opinion is you should never use auto QoS, as if you dont fully understand QoS you should not be applying it. If you do understand it you would not use auto QoS.

Either way cos is layer 2 and dscp is layer 3.

Sent from Cisco Technical Support iPhone App

Silver

Re: COS or DSCP

Hi,

can any body advise me why i am not getting any trrafic cos 5 for incoming and outgoing.(Above example)

i can see dscp incoming and outgoing but not cos incoming but cos that trrafic showing in cos6

dscp: incoming

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

0 - 4 : 47836 0 0 0 0

5 - 9 : 0 0 0 0 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 2535

25 - 29 : 0 274 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 40020 0 0 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

dscp: outgoing

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

0 - 4 : 44479 0 0 0 0

5 - 9 : 0 0 0 16 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 3553

25 - 29 : 0 0 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 60342 0 935 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

cos: incoming

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

0 - 4 : 49311 0 0 2809 0

5 - 7 : 0

40020 0

cos: outgoing

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

0 - 4 : 45546 16 0 3553 0

5 - 7 : 60342 935 0

output queues enqueued:

queue: threshold1 threshold2 threshold3

Green

COS or DSCP

Hi,

The packets leaving the other end of your cable/link are not being set to COS 5.

Investigate the other end device.

Regards,
Alex.
Please rate useful posts.

Regards, Alex. Please rate useful posts.
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