Overview Of Nqa; Introduction To Nqa; Comparisons Between Nqa And Ping - Huawei AR150/200 Series Configuration Manual

Huawei AR150&200 Series Enterprise Routers
Configuration Guide - Network Management

6.1 Overview of NQA

This section describes the basic concepts of NQA and its functions.

6.1.1 Introduction to NQA

This part describes basic concepts and functions of NQA.
With the development of value-added services, users and carriers demand higher Quality of
Service (QoS). After voice over IP and video over IP services are carried out, carriers and users
all tend to sign Service Level Agreements (SLAs) to realize QoS guaranteed services.
To ensure users with the committed bandwidth, network operators should collect the statistics
of delay, jitter, and packet loss of the device. This helps them to analyze the performance of the
network in time.
The AR150/200 provides Network Quality Analysis (NQA) to meet the preceding requirements.
NQA measures the performance of each protocol running in the network and helps the network
operator to collect the network running indexes, such as the total delay of HTTP, delay of a TCP
connection, rate of file transfer, delay of an FTP connection, delay of Domain Name System
(DNS) resolution, and ratio of error DNS resolution. By controlling these indexes, network
operators provide users with services of various grades and charges users differently.
NQA is also an effective tool to diagnose and locate faults in a network.

6.1.2 Comparisons Between NQA and Ping

This part describes the differences between NQA and Ping tests.
NQA is the extension and enhancement of Ping.
By sending an Internet Control Message Protocol (ICMP) Echo-Request packet from the local
and expecting an ICMP Echo-Reply packet from the specified destination, the Ping program can
test the round-trip time (RTT) of an ICMP packet. In addition to testing the RRT of an ICMP
packet between the local and the desination, NQA can detect whether network services, such as
TCP, UDP, FTP, HTTP and the Simple Network Management Protocol (SNMP), are enabled
and test the response time of each service.
Figure 6-1 Diagram of the NQA test
NQA Client
Issue 02 (2012-03-30)
Server
IP/MPLS
Network
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