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Cisco IOS XR Modular Quality of Service Configuration Guide
Configuring Modular Quality of Service
Congestion Management on Cisco IOS XR
Software
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 IOS XR software:
• Modified Deficit Round Robin (MDRR)
• Low-latency queueing (LLQ) with strict priority queueing (PQ)
• Traffic shaping
• Traffic policing
This module provides the conceptual and configuration information for Quality of Service (QoS) packet
queueing methods and traffic regulation mechanisms on Cisco IOS XR software.
Note For additional conceptual information about QoS in general and complete descriptions of the QoS
commands listed in this module, see the “Related Documents” section of this module. To locate
documentation for other commands that might appear in the course of executing a configuration task,
search online in the Cisco IOS XR software master command index.