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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.
• UDP tracert.
• Voice.
• Path jitter.
• DLSw.
As shown in Figure 36, th
e 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 different types of operations:
• A TCP or DLSw operation sets up a connection.
• A UDP jitter or a voice operation sends a number of probe packets. The number of probe
packets is set by using the probe packet-number command.
• An FTP operation uploads or downloads a file.
• An HTTP operation gets a Web page.
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