Deploying The Quality Of Service (Qos); Quality Of Service Overview - Cisco ASR 9000 Series Configuration Manual

Deploying the Quality of Service (QoS)

The Quality of Service (QoS) feature ensures that traffic to and from priority applications gets preference
in using network resources. QoS actions are defined by service-policies that are deployed using policy-maps.
During the QoS process, packets are encapsulated with QoS information. The encapsulation is monitored
and accounted by the QoS accounting function.
Parameterized QoS (PQoS) is another form of QoS in which the traffic priority is based on the characteristic
of the data being carried by the traffic.
BNG supports merging of multiple QoS policy-maps applied through multiple dynamic templates and
implementing them on a single subscriber.
This chapter explains deploying QoS, and covers the following topics:
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Quality of Service Overview

Quality of Service (QoS) is the technique of prioritizing network traffic for time-sensitive and mission-critical
applications such as VoIP services, live streaming of videos, priority accesses to database, and so on. Functions
that QoS provides ensure that such applications receive sufficient bandwidth at low latency, with reduced
data loss.
QoS functions perform preferential forwarding of high-priority packets. To do so, the packet is identified,
classified, and then prioritized on all routers along the data-forwarding path throughout the network. As a
result, priority applications get the resources they require, while other applications access the network,
simultaneously.
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Quality of Service Overview, page 175
Parameterized QoS, page 181
QoS Accounting, page 191
Support for Shared Policy Instance, page 194
Merging QoS Policy-maps, page 200
QoS Features Supported on BNG, page 204
Additional References, page 212
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