QC-1
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
Modular QoS Overview on
Cisco ASR 9000 Series Routers
Quality of Service (QoS) is the technique of prioritizing traffic flows and providing preferential
forwarding for higher-priority packets. The fundamental reason for implementing QoS in your network
is to provide better service for certain traffic flows. A traffic flow can be defined as a combination of
source and destination addresses, source and destination socket numbers, and the session identifier. A
traffic flow can more broadly be described as a packet moving from an incoming interface that is
destined for transmission to an outgoing interface. The traffic flow must be identified, classified, and
prioritized on all routers and passed along the data forwarding path throughout the network to achieve
end-to-end QoS delivery. The terms traffic flow and packet are used interchangeably throughout this
module.
To implement QoS on a network requires the configuration of QoS features that provide better and more
predictable network service by supporting bandwidth allocation, improving loss characteristics,
avoiding and managing network congestion, metering network traffic, or setting traffic flow priorities
across the network.
This module contains overview information about modular QoS features within a service provider
network.
Contents
• Information About Modular Quality of Service on Cisco ASR 9000 Series Routers, page 1
• Where to Go Next, page QC-6
• Additional References, page QC-6
Information About Modular Quality of Service on
Cisco
ASR 9000 Series Routers
Before configuring modular QoS on your network, you should understand the following concepts:
• Benefits of Cisco ASR 9000 Series Routers QoS Features, page 2
• QoS Techniques on Cisco ASR 9000 Series Routers, page 2
• Differentiated Service Model for Cisco IOS XR Software, page QC-4
• Access Node Control Protocol, page QC-5
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