Configuring Modular Qos Congestion Avoidance On Cisco Asr 9000 Series Routers - Cisco ASR 9000 Series Configuration Manual

Configuring Modular QoS Congestion Avoidance
on Cisco ASR 9000 Series Routers
Congestion avoidance techniques monitor traffic flow in an effort to anticipate and avoid congestion at
common network bottlenecks. Avoidance techniques are implemented before congestion occurs as
compared with congestion management techniques that control congestion after it has occurred.
Congestion avoidance is achieved through packet dropping. Cisco IOS XR software supports the
following Quality of Service (QoS) congestion avoidance techniques that drop packets:
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The module describes the concepts and tasks related to these congestion avoidance techniques on the
Cisco ASR 9000 Series Aggregation Services Router.
Note For additional conceptual information about QoS in general and complete descriptions of the QoS
commands listed in this module, see the
documentation for other commands that might appear in the course of executing a configuration task,
search online in the Cisco ASR 9000 Series Router software command index.
Feature History for Configuring Modular QoS Congestion Avoidance on Cisco ASR 9000 Series Routers
Release
Release 3.7 FCI
Contents
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OL-17239-01
D r a f t — C i s c o C o n f i d e n t i a l
Random early detection (RED
Weighted random early detection (WRED)
Taildrop
Modification
This feature was introduced on Cisco ASR 9000 Series Routers.
Prerequisites for Configuring Modular QoS Congestion Avoidance on
Cisco ASR 9000 Series Routers, page 64
Information About Configuring Modular QoS Congestion Avoidance on
Cisco ASR 9000 Series Routers, page 64
How to Configure Modular QoS Congestion Avoidance on Cisco IOS XR Software, page 67
Configuration Examples for Configuring Policy Maps, page 76
Where to Go Next, page 77
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
"Related Documents" section of this module. To locate
QC-63