Introduction To Nqa; Comparisons Between Nqa And Ping; Figure 6-1 Diagram Of The Nqa Test - Huawei Quidway S9300 Configuration Manual - Network Management

Quidway S9300 Terabit Routing Switch
Configuration Guide - Network Management

6.1 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 S9300 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.

6.2 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
In NQA, the RTT of each packet or timeout period of the packet is not displayed on the terminal
in real time, unlike the Ping program. Test results are displayed only when you run the display
nqa results command after a test is complete.
You can also configure the Network Management System (NM Station) to control each NQA
operation parameter and enable NQA tests.
Issue 03 (2010-09-20)
Server
IP/MPLS
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6 NQA Configuration
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