Cisco 2950 Software Configuration Guide - Page 596

Configuring Standard QoS Chapter 30 Configuring QoS Configuring the DSCP-to-CoS Map You use the DSCP-to-CoS map to map DSCP values in incoming packets to a CoS value, which is used to select one of the four egress queues. The switch supports these DSCP values: 0, 8, 10, 16, 18, 24, 26, 32, 34, 40, 46, 48, and 56. Table 30-8 shows the default DSCP-to-CoS map. Table 30-8 Default DSCP-to-CoS Map DSCP values 0 CoS values 0 8, 10 16, 18 24, 26 32, 34 40, 46 48 56 1 2 3 4 5 6 7 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: Step 1 Step 2 Step 3 Step 4 Step 5 Command configure terminal mls qos map dscp-cos dscp-list to cos end show mls qos maps dscp-cos copy running-config startup-config Purpose Enter global configuration mode. Modify the DSCP-to-CoS map. For dscp-list, enter up to 13 DSCP values separated by spaces. Then enter the to keyword. For cos, enter the CoS value to which the DSCP values correspond. The supported DSCP values are 0, 8, 10, 16, 18, 24, 26, 32, 34, 40, 46, 48, and 56. The CoS range is 0 to 7. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To return to the default map, use the no mls qos map dscp-cos global configuration command. This example shows how the DSCP values 26 and 48 are mapped to CoS value 7. For the remaining DSCP values, the DSCP-to-CoS mapping is the default. Switch(config)# mls qos map dscp-cos 26 48 to 7 Switch(config)# exit Switch# show mls qos maps dscp-cos Dscp-cos map: dscp: 0 8 10 16 18 24 26 32 34 40 46 48 56 cos: 0 1 1 2 2 3 7 4 4 5 5 7 7 30-36 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10