Cisco ASR 9000 Series Service Configuration Manual page 138

Contents
Contents
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Information About Hierarchical QoS
Hierarchical QoS allows you to specify QoS behavior at multiple policy levels, which provides a high
degree of granularity in traffic management. A hierarchical policy is a QoS model that enables you to
specify QoS behavior at multiple levels of hierarchy. You can use hierarchical policies to:
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The service-policy command is used to apply a policy to another policy, and a policy to an interface,
subinterface, VC, or VLAN.
For example, in a three-level hierarchical policy, use the service-policy command to apply:
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Benefits of Hierarchical Policies
Depending on the type of hierarchical QoS policy you configure, you can:
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Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
QC-124
Information About Hierarchical QoS, page 124
How to Configure Hierarchical QoS, page 131
Configuration Examples for Hierarchical QoS, page 143
Verifying the Configuration of Hierarchical Policies, page 151
Additional References, page 152
Allow a parent class to shape multiple queues in a child policy
Apply specific policy map actions on the aggregate traffic
Apply class-specific policy map actions
Restrict the maximum bandwidth of a virtual circuit (VC) while allowing policing and marking of
traffic classes within the VC
Bottom-level policy to a middle-level policy
Middle-level policy to a top-level policy
Top-level policy to an interface, subinterface, VC, or VLAN
Shape multiple queues to a single rate
Divide a single class of traffic into one or more subclasses
Specify the maximum transmission rate of a set of traffic classes that are queued separately, which
is essential for virtual interfaces such as Frame Relay PVCs and IEEE 802.1Q virtual VLANs
Configure minimum bandwidth queues on virtual circuits
Shape the aggregate traffic of queues on a physical interface (for example, provide a 10-megabits
per second (Mbps) service on a 100-Mbps physical interface)
Restrict the maximum bandwidth of a VC while allowing policing and marking of classes within the
VC
Configuring Hierarchical Modular QoS on Cisco ASR 9000 Series Routers
OL-23108-02