NOTE
The reset qos queue statistics command cannot be used on S-series and W-series boards.
For details about S-series and W-series boards, see Board Classification in the Quidway S7700 Smart
Routing Switch Hardware Description.
----End
3.5 Configuration Examples
This section provides several configuration examples of congestion avoidance and congestion
management.
3.5.1 Example for Configuring Congestion Avoidance and
Congestion Management
After congestion avoidance and congestion management are configured, the S7700 provides
different services for packets of different priorities and ensures high-priority and low-delay
services.
Networking Requirements
The Switch is connected to the router through GE 2/0/1; the 802.1p priorities of voice, video,
and data services on the Internet are 6, 5, and 2 respectively, and these services can reach users
through the router and Switch, as shown in Figure 3-1. The rate of incoming interface GE
2/0/1 on the Switch is greater than the rates of outgoing interfaces GE 1/0/1 and GE 1/0/2;
therefore, congestion may occur on these two outgoing interfaces. To reduce the effect caused
by congestion and ensure that high-priority and short-delay services are processed first, the
requirements are as follows.
Table 3-1 Congestion avoidance parameters
Types of
Services
Color Lower
Threshold (%)
Upper
Threshold (%)
Drop Percent
Voice Green 80 100 10
Video Yellow 60 80 20
Data Red 40 60 40
Table 3-2 Congestion management parameters
Type of Services
CoS
Voice EF
Video AF3
Data AF1
Quidway S7700 Smart Routing Switch
Configuration Guide - QoS
3 Congestion Avoidance and Congestion Management
Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
89
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