Configuring The Dscp-To-Cos Map - Cisco WS-C2960-24LC-S Software Configuration Manual

Chapter 28 Configuring QoS
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 28-14
Table 28-14
DSCP Value
0–7
8–15
16–23
24–31
32–39
40–47
48–55
56–63
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
Step 4 show mls qos maps dscp-to-cos
Step 5
copy running-config startup-config
To return to the default map, use the no mls qos dscp-cos global configuration command.
OL-8603-04
shows the default DSCP-to-CoS map.
Default DSCP-to-CoS Map
CoS Value
0
1
2
3
4
5
6
7
Purpose
Enter global configuration mode.
Modify the DSCP-to-CoS map.
• 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.
The DSCP range is 0 to 63; the CoS range is 0 to 7.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 2960 Switch Software Configuration Guide
Configuring Standard QoS
28-55