H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 581)

63-2
At present, NQA supports nine test types: ICMP-echo, DHCP, FTP, HTTP, UDP-jitter, SNMP, TCP,
UDP-echo and DLSw.
In an NQA test, the client sends different types of test packets to the peer to detect the availability and
the response time of the peer, helping you know protocol availability and network performance based
on the test results.
Supporting the collaboration function
Collaboration is implemented by establishing collaboration entries to monitor the detection results of the
current test group. If the number of consecutive probe failures reaches a certain limit, NQA’s
collaboration with other modules is triggered. The implementation of collaboration is shown in
Figure
63-1 .
Figure 63-1 Implementation of collaboration
The collaboration here involves three parts: the application modules, the Track module, and the
detection modules.
z
The detection modules monitor the link status, network performance and so on, and inform the
Track module of the detection result.
z
Upon receiving the detection result, the Track module changes the status of the Track object
accordingly and informs the application modules. The Track module works between the application
modules and the detection modules and is mainly used to obscure the difference of various
detection modules to provide a unified interface for application modules.
z
The application modules then deal with the changes accordingly based on the status of the Track
object, and thus collaboration is implemented.
Take static routing as an example. You have configured a static route with the next hop 192.168.0.88. If
192.168.0.88 is reachable, the static route is valid; if 192.168.0.88 is unreachable, the static route is
invalid. With the collaboration between NQA, Track module and application modules, real time
monitoring of reachability of the static route can be implemented:
1) Monitor reachability of the destination 192.168.0.88 through NQA.
2) If 192.168.0.88 is detected to be unreachable, NQA will inform the static routing module through
Track module.
3) The static routing module then can know that the static route is invalid.