QC-43
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
Configuring Modular QoS Congestion
Management on Cisco ASR 9000 Series Routers
Congestion management controls congestion after it has occurred on a network. Congestion can be
managed on Cisco
IOS XR software by using packet queueing methods, and by shaping the packet flow
through use of traffic regulation mechanisms.
Packet queueing methods define packet scheduling or the order in which packets are dequeued to the
interface for transmission on the physical wire. Furthermore, queueing methods support minimum
bandwidth guarantees and low latencies based on the order and number of times that a queue is serviced.
The following types of queueing methods and traffic regulation mechanisms are supported on the
Cisco
ASR 9000 Series Aggregation Services Routers :
• Modified Deficit Round Robin (MDRR)
• Low-latency queueing (LLQ) with strict priority queueing (PQ)
• Traffic shaping
• Traffic policing
Line Card, SIP, and SPA Support
Feature ASR 9000 Ethernet Line Cards SIP 700 for the ASR 9000
Congestion Management Using
DEI
yes no
Guaranteed and Remaining
Bandwidth
yes yes
Low-Latency Queueing with Strict
Priority Queueing
yes yes
Traffic Policing yes yes
Traffic Shaping yes yes
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