Configuring Modular QoS Service Packet Classification and Marking on Cisco ASR 9000 Series Routers
Information About Configuring Modular QoS Packet Classification and Marking on Cisco ASR 9000 Series Routers
QC-14
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
Policy Inheritance
When a policy map is applied on a physical port, the policy is enforced for all Layer 2 and Layer 3
subinterfaces under that physical port.
Port Shape Policies
When a port shaping policy is applied to a main interface, individual regular service policies can also be
applied on its subinterfaces. Port shaping policy maps have the following restrictions:
• class-default is the only allowed class map.
• The shape class action is the only allowed class action.
• They can only be configured in the egress direction.
• They can only be applied to main interfaces, not to subinterfaces.
• Two- and three- level policies are not supported. Only one level or flat policies are supported.
If any of the above restrictions are violated, the configured policy map isapplied as a regular policy, not
a port shaping policy.
For more information on configuring class maps, configuring policy maps, applying class actions, and
applying service policies, see
How to Configure Modular QoS Packet Classification and Marking on
Cisco ASR 9000 Series Routers, page 19.
Class-based Unconditional Packet Marking Feature and Benefits
The Class-based, Unconditional Packet Marking feature provides users with a means for efficient packet
marking by which the users can differentiate packets based on the designated markings.
The Class-based, Unconditional Packet Marking feature allows users to perform the following tasks:
• Mark packets by setting the IP precedence bits or the IP differentiated services code point (DSCP)
in the IP ToS byte.
• Mark Multiprotocol Label Switching (MPLS) packets by setting the EXP bits within the imposed or
topmost label.
• Mark packets by setting the Layer 2 class-of-service (CoS) value.
• Mark packets by setting inner and outer CoS tags for an IEEE 802.1Q tunneling (QinQ)
configuration.
• Mark packets by setting the value of the qos-group argument.
• Mark packets by setting the value of the discard-class argument.
Note qos-group and discard-class are variables internal to the router, and are not transmitted.
Unconditional packet marking allows you to partition your network into multiple priority levels or
classes of service, as follows:
• Use QoS unconditional packet marking to set the IP precedence or IP DSCP values for packets
entering the network. Routers within your network can then use the newly marked IP precedence
values to determine how the traffic should be treated.
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