Configuring The Dscp-To-Cos Map - Cisco WS-C3750-48PS-S Software Configuration Manual

Network switch
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Configuring Standard QoS
To return to the default map, use the no mls qos policed-dscp global configuration command.
This example shows how to map DSCP 50 to 57 to a marked-down DSCP value of 0:
Switch(config)# mls qos map policed-dscp 50 51 52 53 54 55 56 57 to 0
Switch(config)# end
Switch# show mls qos maps policed-dscp
Policed-dscp map:
In this policed-DSCP map, the marked-down DSCP values are shown in the body of the matrix. The d1
Note
column specifies the most-significant digit of the original DSCP; the d2 row specifies the
least-significant digit of the original DSCP. The intersection of the d1 and d2 values provides the
marked-down value. For example, an original DSCP value of 53 corresponds to a marked-down DSCP
value of 0.

Configuring the DSCP-to-CoS Map

You use the DSCP-to-CoS map to generate a CoS value, which is used to select one of the four egress
queues.
Table 32-14
Table 32-14 Default DSCP-to-CoS Map
DSCP value
CoS value
If these values are not appropriate for your network, you need to modify them.
Beginning in privileged EXEC mode, follow these steps to modify the DSCP-to-CoS map. This
procedure is optional.
Command
Step 1
configure terminal
Step 2
mls qos map dscp-cos dscp-list to cos
Step 3
end
Catalyst 3750 Switch Software Configuration Guide
32-52
d1 :
d2 0
1
2
3
4
---------------------------------------
0 :
00 01 02 03 04 05 06 07 08 09
1 :
10 11 12 13 14 15 16 17 18 19
2 :
20 21 22 23 24 25 26 27 28 29
3 :
30 31 32 33 34 35 36 37 38 39
4 :
40 41 42 43 44 45 46 47 48 49
5 :
00 00 00 00 00 00 00 00 58 59
6 :
60 61 62 63
shows the default DSCP-to-CoS map.
0–7
8–15
0
1
Purpose
Enter global configuration mode.
Modify the DSCP-to-CoS map.
The DSCP range is 0 to 63; the CoS range is 0 to 7.
Return to privileged EXEC mode.
5
6
7
8
9
16–23
24–31
32–39
2
3
4
For dscp-list, enter up to eight DSCP values separated by spaces.
Then enter the to keyword.
For cos, enter the CoS value to which the DSCP values correspond.
Chapter 32
40–47
48–55
56–63
5
6
7
Configuring QoS
78-16180-02

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