H3C Technologies H3C SR8800 - Manual (Page 20)

8
Configuring NQA
NQA overview
Network Quality Analyzer (NQA) can perform various types of tests and collect network performance
and service quality parameters such as delay jitter, time for establishing a TCP connection, time for
establishing an FTP connection, and file transfer rate.
With the NQA test results, you can diagnose and locate network faults, know network performance in
time and take proper actions.
NQA features
Supporting multiple test types
Ping can use only the Internet Control Message Protocol (ICMP) to test the reachability of the destination
host and the round-trip time. As an enhancement to Ping, NQA provides more test types and functions.
NQA supports 11 test types: ICMP echo, DHCP, DNS, FTP, HTTP, UDP jitter, SNMP, TCP, UDP echo, voice
and DLSw.
NQA enables the client to send probe packets of different test types to detect the protocol availability
and response time of the peer. The test result helps you understand network performance.
Supporting the collaboration function
Collaboration is implemented by establishing reaction entries to monitor the detection results of NQA
probes. If the number of consecutive probe failures reaches a limit, NQA informs the track module of the
detection result, and the track module triggers other application modules to take predefined.
Figure 5 Implementing collaboration
The collaboration comprises the following parts: the application modules, the track module, and the
detection modules.
• A detection module monitors specific objects, such as the link status, and network performance,
and informs the track module of detection results.
• Upon the detection results, the track module changes the status of the track entry and informs the
associated application module. The track module works between the application modules and the
detection modules. It hides the differences among detection modules from application modules.