Cisco Systems 3750E manual Configuring the DSCP-to-CoS Map, Dscp Value CoS Value, 36-66, Show

Chapter 36 Configuring QoS

Configuring Standard QoS

To return to the default map, use the no mls qos policed-dscpglobal 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:
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

Note In this policed-DSCP map, the marked-down DSCP values are shown in the body of the matrix. The d1 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 36-14shows the default DSCP-to-CoS map.

Table 36-14	Default DSCP-to-CoS Map
DSCP Value		CoS Value
0–7		0
8–15		1
16–23		2
24–31		3
32–39		4
40–47		5
48–55		6
56–63		7

If these values are not appropriate for your network, you need to modify them.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
36-66	OL-9775-02