Configuring Congestion Management; Establishing The Configuration Task - Huawei Quidway S7700 Configuration Manual - Qos

Quidway S7700 Smart Routing Switch
Configuration Guide - QoS

3.3 Configuring Congestion Management

After congestion management is configured, if congestion occurs on a network, the S7700
determines the sequence of forwarding packets according to the defined scheduling policy.

3.3.1 Establishing the Configuration Task

Before configuring congestion management, familiarize yourself with the applicable
environment, complete the pre-configuration tasks, and obtain the required data. This will help
you complete the configuration task quickly and accurately.
Applicable Environment
When congestion occurs, you can configure congestion management in the following situations:
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Pre-configuration Tasks
Before configuring congestion management, complete the following tasks:
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Data Preparation
To configure congestion management, you need the following data.
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Issue 01 (2011-07-15)
The same delay and jitter are set for various types of packets, and packets of core services
such as video and voice services need to be processed first.
Packets of non-core services of the same priority, such as email, are processed in a fair
manner, and services of different priorities are processed according to the weights.
Configuring priority mapping based on simple traffic classification to map priorities of
packets to PHBs
Configuring the remarking action of inner priorities based on complex traffic classification
NOTE
Before configuring congestion management, you need to perform either of the preceding tasks to map
packets to different queues for scheduling.
Data
Mapping between the local precedence and queues.
Mode of queue scheduling.
Weight of queues in deficit round robin (DRR) scheduling mode.
Weight of queues in weighted round robin (WRR) scheduling mode.
(Optional) Minimum size of the static buffer for a queue.
(Optional) Maximum number of packets for a queue
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3 Congestion Avoidance and Congestion Management
Configuration
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