Pfc Marking And Policing - Cisco 7609 Configuration Manual

Understanding How PFC QoS Works
Note The explanations in this section use default values. You can configure many of the parameters (see the
"Configuring PFC QoS" section on page
drop-threshold configuration.
Figure 32-9
configurations function similarly.
Figure 32-9 Receive Queue Drop Thresholds
Reserved for
CoS 6 and 7
Reserved for
CoS 4 and higher
Reserved for
CoS 2 and higher
Available for
traffic with any
CoS value
100% available for CoS 6 and 7
80% available for CoS 4 and 5
60% available for CoS 2 and 3
50% available for CoS 0 and 1

PFC Marking and Policing

Note •
•
These sections describe PFC marking and policing:
•
•
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
32-16
illustrates the drop thresholds for a 1q4t ingress LAN port. Drop thresholds in other
Drop threshold 4: 100%
Drop threshold 3: 80%
Drop threshold 2: 60%
Drop threshold 1: 50%
Receive queue
To mark untrusted traffic without policing in Release 12.1(12c)E1 and later releases, use the set ip
dscp or set ip precedence policy map class commands (see the
Actions" section on page 32-44).
To mark untrusted traffic without policing in earlier releases, create a policer that only marks and
does not police.
Internal DSCP Values, page 32-17
Policy Maps, page 32-18
32-33). All LAN ports of the same type use the same
Traffic is dropped
(Default values shown)
Chapter 32 Configuring PFC QoS
"Configuring Policy Map Class
78-14064-04