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Saturday, January 28, 2012

Cos-to-DSCP:
By default CoS-to-DSCP :
CoS-DSCP map :

cos:   0     1      2      3       4      5     6      7
---------------------------------------------------------
dscp :0    8    16    24    32    40    48    56


Using following command to change this map on switch:

switch(config)# mls qos map cos-dscp dscp1 dscp2 dscp3 dscp4 dscp5 dscp6 dscp7 dscp8

DSCP-to-CoS:
By default DSCP-to-CoS map:


DSCP CoS
0~7 0
8~15 1
16~23 2
24~31 3
32~39 4
40~47 5
48~55 6
56~63 7

Use following command to check switch map table:
swtich#show mls qos maps dscp-qos

To change DSCP -to-Cos map , use this command:

switch(config)# mls qos map dscp-cos dscp1 dscp2 dscp3 dscp4 dscp5 dscp6 dscp7 dscp8 to cos


Summary: 

DSCP Value DSCP Name COS Value
0 Default (BF) 0
8 CS1 1
10 AF11 1
12 AF12 1
14 AF13 1
16 CS2 2
18 AF21 2
20 AF22 2
22 AF23 2
24 CS3 3
26 AF31 3
28 AF32 3
30 AF33 3
32 CS4 4
34 AF41 4
36 AF42 4
38 AF43 4
40 CS5 5
42   5
44   5
46 EF 5
48 CS6 6
56 CS7 7

Note: EF is matching DSCP=46; COS=5 is matching DSCP=40

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