Cisco 10000 Series Configuration Manual page 441

Chapter 14 Simultaneous Policy Maps
Table 14-2
Session-Level Policy Actions
match cos
match ip precedence
match dscp
match discard-class
match qos-group
match interface
match exp
match acl
match protocol
OL-7433-09
Influence of Session-Level Policy Actions on Interface-Level Policy Actions
Effect on Interface-Level Policy Actions
Valid as an input classification criteria on an Ethernet interface.
Configurable on the Ethernet interface, including a VLAN and
QinQ subinterface, and on a PPPoE session traversing an Ethernet
interface.
The interface-level policy does not influence the classification
done by the session policy.
Both the session-level and interface-level policies may use this
criteria.
Note
Valid as an input or output criteria and valid on all interface and
session types.
The action (or class) taken by the session-level policy influences
the class of the interface-level policy that the packet matches.
Valid as an output criteria on either session-level or
interface-level policies. Set as an input action and used in output
classification. Therefore, the input action does not affect the
output classification.
If both input policies attempt to set the discard-class or qos-group,
the value set by the session-level policy takes precedence.
Note
Valid as an output classification criteria and is not influenced by
any actions at any of the policy levels.
Note
Not applicable to these types of session interfaces.
Dependent on the statements contained in the ACL. The only
values that may change between the session- and interface-level
policies is the precedence and DSCP fields. All other fields do not
change. Therefore, the session-level policy does not influence the
classification action of the interface-level policy, except in the
case of the precedence and DSCP fields.
Valid as an input or output criteria on all interface and session
types, and is unchanged by the policies. Therefore, the
session-level policy does not influence the classification action of
the interface-level policy.
Cisco 10000 Series Router Quality of Service Configuration Guide
Simultaneous QoS Policy Map on an Interface and PPP Session
The session-level policy with the set cos command can
cause more packets to be classified by an interface-level
policy with the match cos command. The session policy
sets the CoS bits of the appropriate traffic and the
interface policy classifies the packets according to their
CoS values.
Typically, the discard-class is used in a queuing policy to
allow different drop probabilities. Therefore, limit
discard-class usage to only the interface-level policy.
In this case, the interface is the session.
14-3