Cisco Systems 6500, EA6500 - page 459

31-69
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
78-14099-04
Chapter 31 Configuring PFC QoS
Configuring PFC QoS
Note When you create a policer that does not use the pir keyword, and the maximum_burst_bytes
parameter is equal to the normal_burst_bytes parameter (which occurs if you do not enter
the maximum_burst_bytes parameter), the exceed-action policed-dscp-transmit keywords
cause PFC QoS to mark traffic down as defined by the policed-dscp max-burst markdown
map.
• To avoid out-of-sequence packets, configure the markdown maps so that conforming and
nonconforming traffic uses the same queue.
• You can enter up to 8 DSCP values that map to a marked-down DSCP value.
• You can enter multiple commands to map additional DSCP values to a marked-down DSCP value.
• You can enter a separate command for each marked-down DSCP value.
Note Configure marked-down DSCP values that map to CoS values consistent with the markdown penalty (see
the “Mapping Internal DSCP Values to Egress CoS Values” section on page 31-67).
This example shows how to map DSCP 1 to marked-down DSCP value 0:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# mls qos map policed-dscp normal-burst 1 to 0
Router(config)# end
This example shows how to verify the configuration:
Router# show mls qos map
Normal Burst Policed-dscp map: (dscp= d1d2)
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 : 50 51 52 53 54 55 56 57 58 59
6 : 60 61 62 63
Maximum Burst Policed-dscp map: (dscp= d1d2)
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 : 50 51 52 53 54 55 56 57 58 59
6 : 60 61 62 63
<...Output Truncated...>
Router#
Note In the Policed-dscp displays, the marked-down DSCP values are shown in the body of the matrix; the
first digit of the original DSCP value is in the column labeled d1 and the second digit is in the top row.
In the example shown, DSCP 41 maps to DSCP 41.