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Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 1 Quality of Service Overview
QoS Management Information Base Support
Feature History for QoS CLI Migration from PRE2 to PRE3
QoS Management Information Base Support
The Cisco 10000 series router supports the Cisco Class-Based Quality of Service Management
Information Base (Class-based QoS MIB). This MIB provides read access to QoS configurations and
also provides QoS statistical information based on the modular QoS CLI (MQC), including information
about class map and policy map parameters.
The Class-based QoS MIB is actually two MIBs: CISCO-CLASS-BASED-QOS-MIB and
CISCO-CLASS-BASED-QOS-CAPABILITY-MIB.
To locate MIBs online, use the Cisco Network Management Toolkit for MIBs tool available on
Cisco.com.
QoS Implementation Guidelines
Typically, the business model that you define and the applications you use determine the QoS features
needed to meet your network requirements. Before deciding which QoS features to implement, consider
the following guidelines:
•
Provide preferential service to customers or applications that cannot tolerate dropped packets during
periods of congestion.
•
Provide dedicated bandwidth and low-latency queuing to privileged data that cannot tolerate delay.
•
Share the bandwidth fairly among competing traffic. For example, allocate percentages of a link
bandwidth to the various applications.
•
Prevent congestion by using congestion control algorithms such as random early detection (RED)
and weighted random early detection (WRED), instead of using the default tail drop mode of
operation.
•
Police and shape transmission rates to limit and control traffic that exceeds predefined transmission
rate limits.
•
Identify, set, or modify traffic priorities to provide end-to-end service quality.
QoS Execution on the Router
The Cisco 10000 series router executes the QoS features in the following order:
1.
Fragment reassembly
2.
QoS Policy Propagation through Border Gateway Protocol (QPPB)
3.
Input classification
4.
Input marking
Cisco IOS Release
Description
Required PRE
Release 12.2(31)SB2
This feature was introduced.
PRE3
Release 12.2(33)SB
This feature was introduced on the PRE4.
PRE4
