Cisco 6500 Series Software Configuration Manual page 397

Chapter 31 Configuring PFC QoS
Figure 31-3 Ingress LAN Port Layer 2 PFC QoS Features
Port set to
untrusted?
Port set to
trust-ipprec?
Port set to
trust-dscp?
Port is set to
78-14099-04
Frame
enters
Ethernet ingress port classification, marking,
switch
scheduling, and congestion avoidance
Yes
Apply
port
CoS
No
Apply
No
ISL or
port
802.1Q?
CoS
Yes
Yes
No
Yes
No
trust-cos
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
Drop thresholds
switching engine
Understanding How PFC QoS Works
To
31-7