42-55
Cisco7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter42 Configuring PFC QoS
Configuring PFCQo S

IP Precedence and DSCP Values

Configuring PFC QoS
These sections describe how to configure PFCQoS on the Cisco 7600 series routers:
•Enabling PFC QoS Globally, page 42-56
•Enabling Ignore Port Trust, page 42-57
•Configuring DSCP Transparency, page 42-58
•Enabling Queueing-Only Mode, page 42-58
3-bit IP
Precedence
6 MSb1 of ToS
1. MSb = most significant bit
6-bit
DSCP
3-bit IP
Precedence
6 MSb1 of ToS 6-bit
DSCP
876 543 876 543
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
2
3
4
5
6
7
41
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
32
33
34
35
36
37
38
39
10
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
8
9
10
11
12
13
14
15
51
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
40
41
42
43
44
45
46
47
20
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
16
17
18
19
20
21
22
23
61
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
48
49
50
51
52
53
54
55
30
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
24
25
26
27
28
29
30
31
71
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
56
57
58
59
60
61
62
63