Cisco Systems EA6500 Manual De Usuario

These sections summarize the PFC QoS features:

PFC QoS supports classification, marking, scheduling, and congestion avoidance using Layer 2 CoS 
values at ingress LAN ports. Classification, marking, scheduling, and congestion avoidance at ingress 
LAN ports do not use or set Layer 3 IP precedence or DSCP values. You can configure ingress LAN port 
trust states that can be used by the PFC to set Layer 3 IP precedence or DSCP values and the Layer 2 
CoS value. See 

 and the 

PFC QoS associates CoS zero with all traffic received through ingress OSM ports. You can configure 
ingress OSM port trust states that can be used by the PFC to set Layer 3 IP precedence or DSCP values 
and the Layer 2 CoS value. You can configure the trust state of each ingress OSM port as follows:

Untrusted (default)

Trust IP precedence 

Trust DSCP 

Trust CoS (CoS is always zero because the default port CoS is not configurable on OSM ports.)

On the PFC, PFC QoS supports ingress classification, marking, and policing using policy maps. You can 
attach one policy map to an ingress port. Each policy map can contain multiple policy-map classes. You 
can configure a separate policy-map class for each type of traffic received through the ingress port. See 
the 

.

You can globally disable marking and policing with the mls qos queueing-only command (see the 

).

You can disable marking and policing on a per-interface basis with the no mls qos interface 
command (see the