H3C Technologies H3C S6300 Series Switches - Manual (Page 126)

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Configuring NQA
Overview
Network quality analyzer (NQA) allows you to measure network performance, verify the service levels
for IP services and applications, and troubleshoot network problems. It provides the following types of
operations:
• ICMP echo
• DHCP
• DNS
• FTP
• HTTP
• UDP jitter
• SNMP
• TCP
• UDP echo
• Voice
• Path jitter
• DLSw
As shown in Figure 36 , the NQA source device (NQA client) sends data to the NQA destination device
by simulating IP services and applications to measure network performance. The obtained performance
metrics include the one-way latency, jitter, packet loss, voice quality, application performance, and
server response time.
All types of NQA operations require the NQA client, but only the TCP, UDP echo, UDP jitter, and voice
operations require the NQA server. The NQA operations for services that are already provided by the
destination device such as FTP do not need the NQA server.
You can configure the NQA server to listen and respond to specific IP addresses and ports to meet
various test needs.
Figure 36 Network diagram
NQA operation
The following describes how NQA performs operations of different types:
• A TCP or DLSw operation sets up a connection.