Cisco 4500M Software Manual page 383

Chapter 29 Configuring QoS
Figure 29-3 Classification Flowchart
Read interface
configuration for classification.
QoS policy attached
to this interface?
Use Port Trust
Assign Port default
OL-6696-01
Start
Are there
Is there a
Yes any more
traffic classes with
QoS
actions?
No No
No
configuration.
Yes
Trust IP
DSCP? Packet?
No
No
Packet
Yes
Trust
recieved with
CoS?
Tag (with
CoS)?
Yes
No
Generate DSCP from CoS
DSCP using CoS to DSCP map
Yes
Does the
packet satisfy
No
the classification
match criteria?
Yes
Does the
Yes
policy action
Use configured
specify DSCP for
DSCP in ACL
this traffic
class
No
Is Trust
configured for this
traffic class
Yes
Use Policy Trust
configuration.
Yes
Use DSCP from
the packet
Use Port
default DSCP
No
Use Port
CoS
Done
Software Configuration Guide—Release 12.2(25)EW
Overview of QoS
29-7