27-52
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter27 Configuring Quality of Service
Configuring QoS
This example shows how to modify and display the CoS-to-DSCP map:
Switch# configure terminal
Switch(config)# qos map cos 0 to dscp 20
Switch(config)# end
Switch# show qos maps cos dscp
CoS-DSCP Mapping Table:
CoS: 0 1 2 3 4 5 6 7
--------------------------------
DSCP: 20 8 16 24 32 40 48 56
Switch(config)#
Configuring the Policed-DSCP Map
You use the policed-DSCP map to mark down a DSCP value to a new value as the result of a policing
and marking action.
The default policed-DSCP map is a null map, which maps an incoming DSCP value to the same DSCP
value.
To modify the CoS-to-DSCP map, perform this task:
To return to the default map, use the no qos dscp policed global configuration command.
This example shows how to map DSCP 50 to 57 to a marked-down DSCP value of 0:
Switch# configure terminal
Switch(config)# qos map dscp policed 50 51 52 53 54 55 56 57 to dscp 0
Switch(config)# end
Switch# show qos maps dscp policed
Policed-dscp map:
d1 : d2 0 1 2 3 4 5 6 7 8 9
---------------------------------------
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
Command Purpose
Step1 Switch# configure terminal Enters global configuration mode.
Step2 Switch(config)# qos map dscp policed
dscp-list
to
dscp
mark-down-dscp
Modifies the policed-DSCP map.
•For dscp-list, enter up to 8 DSCP values separated by
spaces. Then enter the to keyword.
•For mark-down-dscp, enter the corresponding policed
(marked down) DSCP value.
Step3 Switch(config)# end Returns to privileged EXEC mode.
Step4 Switch# show qos maps dscp policed Verifies your entries.
Step5 Switch# copy running-config startup-config (Optional) Saves your entries in the configuration file.