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Why do we call "Hierarchical" Qos ?

Posted on 2015-02-15
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Last Modified: 2015-02-16
Dear All
Can you give a example to explain "Hierarchical" Qos/non-hierarchical Qos or a link ? Thank you
regards
eemoon
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kevinhsieh earned 500 total points
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http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-2/qos/configuration/guide/qc42hqos.html

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:

•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

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:

•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

Benefits of Hierarchical Policies

Depending on the type of hierarchical QoS policy you configure, you can:

•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
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