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.
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.
QoS functions provide service providers cost benefits by enabling them to use existing resources efficiently
and ensure the required level of service without reactively expanding, or over-provisioning their networks.
QoS also improves customer experience when they get reliable services from a variety of network applications.
It is ideal to deploy QoS on BNG because BNG is present at the edge router, and subscriber directly connects
to it. One of the unique features of BNG is QoS accounting. This feature enables BNG to collect and report
QoS encapsulation information to the RADIUS server. For details, see
OL-26148-02
Quality of Service Overview, page 103
Parameterized QoS, page 108
QoS Accounting, page 119
QoS Features Supported on BNG, page 121
Additional References, page 127
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide, Release
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C H A P T E R
QoS Accounting, on page 119.
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