Figure 58: Hierarchical Scheduling Architecture - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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Figure 58: Hierarchical Scheduling Architecture

NOTE: Hierarchical class of service is also referred to as Hierarchical Quality
of Service (HQoS) in other vendor's documentation.
A typical application of HCoS is to configure multiple levels of egress schedulers and
shapers, at the subscriber edge, using dynamic profiles to provide traffic shaping and
prioritization at the subscriber VLAN level and for multiple classes of traffic.
Dynamic profiles are a mechanism that allows you to dynamically apply schedulers and
shapers to individual subscribers or groups of subscribers.
To learn more about HCoS, the following topics are very helpful:
Junos CoS on MX Series 3D Universal Edge Routers Overview
CoS Features and Limitations on MX Series Routers
CoS Features of the Router Hardware, PIC, MIC, and MPC Interface Families
How Schedulers Define Output Queue Properties
Subscriber Access Network Overview
CoS for Subscriber Access Overview
Hierarchical Class of Service for Subscriber Management Overview
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