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CHAPTER 15
QoS Profile Overview
QoS Profile Overview
Related
Documentation
Managing System Resources for Nodes and Queues
Copyright © 2010, Juniper Networks, Inc.
This chapter provides information for configuring an interface with QoS profiles on E Series
routers.
QoS topics are discussed in the following sections:
QoS Profile Overview on page 121
Managing System Resources for Nodes and Queues on page 121
Scaling Subscribers on the TFA ASIC with QoS on page 122
You create an interface hierarchy for QoS by configuring a QoS profile that specifies
queue profiles, drop profiles, statistics profiles, and scheduler profiles in combination
with interface types. A QoS profile specifies the queue, drop statistics gathering, and
scheduler configuration for a subtree of the interface hierarchy. The QoS profile controls
the way scheduler nodes, queues, and shadow nodes are bound to the interfaces above
its attachment point in the interface hierarchy.
You can attach a QoS profile to the interface at the base of the subtree hierarchy, an
ATM VP, or an S-VLAN. For example, a QoS profile attached to an ATM port specifies
queuing attributes for interfaces of all types that are stacked over the port.
Supported Interface Types for QoS Profiles on page 125
Configuring a QoS Profile on page 126
The type of ASIC that each line module uses determines the system resources for nodes
and queues.
Line modules with the EFA ASIC hardware provide 85,000 descriptors that are shared
between all nodes and queues. Each line module supports a maximum of 49,000 nodes
or queues per line module.
Line modules with the FFA ASIC hardware provide 2000 level 1 nodes or queues and
64,000 level 2 nodes or queues. The ES2 4G LM provides 2000 level 1 nodes or queues
121
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