1 Product Overview
Quidway NetEngine20/20E
Configuration Guide - Basic Configurations
1-16
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 05 (2010-01-30)
Traffic policing does not influence the forwarding performance of the device because a
hardware coprocessor is used internally to implement the Committed Access Rate (CAR).
Congestion Management
The NE20/20E adopts the Weighted Random Early Detection (WRED) congestion control
mechanism.
The NE20/20E can configure individual congestion control algorithm for each priority queue
on the port.
Traffic Shaping
The NE20/20E adopts the Generic Traffic Shaping (GTS) algorithm to buffer packets, to
avoid the congestion of downstream devices and to reduce the drop of packets. The NE20/20E
supports the shaping for services like Expedited Forwarding (EF) and Assured Forwarding
(AF) to smooth the transmission rate of Diff-Serv services to the downstream traffic.
Traffic Classification
The NE20/20E supports simple and complex traffic classification.
If no QoS guarantee or traffic classification is required, or there are no rules to match packets
after traffic classification, the device processes the packets with the Best-Effort (BE) service.
VPN QoS
As a QoS Policy Propagation through the Border Gateway Protocol (QPPB) policy, VPN QoS
can transmit private network routes through BGP, which extends QPPB application in L3VPN
environment. It can be applied to VPN instances and VPNv4.
When VPN QoS is applied to the private network route of a specific VPN instance, the
inbound and outbound route policy should be applied to the VPN instance. If VPN QoS is
applied to the private network route of all VPN instances, the inbound and outbound route
policy should be applied to VPNv4 neighbors of BGP.
FR QoS
FR has its own QoS that can be configured with Permanent Virtual Paths (PVCs) to provide
flexible services for customers.
The NE20/20E supports multiple QoS technologies like FRTS, FRTP, FR congestion
management, FR queue management and FR fragmentation.
HQoS
Hierarchical Qos (HQoS) is a kind of QoS technology that can control traffic and carry out
queue scheduling on the basis of the user's priority at the same time. HQoS uses a two-level
scheduling mode and supports the following two scheduling modes:
z
Priority Queue (PQ)
z
Confirmed Bandwidth Priority Queue (CBPQ)
HQoS supports complete traffic statistics. You can view the bandwidth usage of all services
and distribute bandwidth properly according to traffic analysis.