Cisco Catalyst 4500 Series, Software Configuration Manual

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 44 Configuring Quality of Service
Configuring QoS on a Standalone Supervisor Engine 6-E/6L-E or Supervisor Engine 7-E/7L-E/8-E
table-map table-map1
map from 0 to 1
map from 2 to 3
exit
The following table lists the traffic attributes for which a to-from relationship can be established using
the table map.
The following is an example of a policy map (policy2) configured to use the table map (table-map1)
created earlier:
Policy map policy
class class-default
set cos dscp table table-map
exit
In this example, a mapping relationship was created between the CoS attribute and the DSCP attribute
as defined in the table map.
For information on configuring a policy map to use a table map, “Configuring a Policy Map” section on
page 44-50.
The final task is to attach the policy map to the interface. For information on attaching the policy map
to the interface, see the “Attaching a Policy Map to an Interface” section on page 44-51.
Marking Action Drivers
A marking action can be triggered based on one of the two QoS processing steps.
Classification based: In this case, all the traffic matching a class is marked using either explicit or
tablemap based method. This method is referred to as
unconditional marking.
Policer result-based: In this case, a class of traffic is marked differently based on the policer result
(conform/exceed/violate) applicable to that packet. This method is referred to as
conditional
marking.
Traffic Marking Procedure Flowchart
Figure 44-5 illustrates the order of the procedures for configuring traffic marking.
Table 44-5 Traffic Attributes for Which a To-From Relationship Can Be Established
The “To” Attribute The “From” Attribute
Precedence CoS, QoS group, DSCP, Precedence
DSCP COS, QoS group, DSCP, Precedence
CoS DSCP, QoS group, CoS, Precedence