127 TRACK C ONFIGURATIONTrack Overview Figure 644 Collaboration through the Track moduleThe Track module is used to implement collaboration of different modules byestablishing collaboration objects. The collaboration here involves three parts: theapplication modules, the Track module, and the detection modules. The Trackmodule works between the application modules and the detection modules and ismainly used to shield the difference of various detection modules to provide aunified interface for application modules. When the status of a detected object(Reaction entry) changes, the detection module informs the Track module of thechange. The Track module then tells the corresponding application module to dealwith the change accordingly. In this way, the collaboration is implemented.Collaboration betweenthe Track Module andthe Detection ModulesYou can establish the collaboration between the Track module and the detectionmodules through configuration. A detection module probes a Reaction entry andinforms the Track module of the probe result. The Track module then changes thestatus of the Track object accordingly. If the probe of the Reaction entry succeeds,the status of the corresponding Track object is positive; If fails, negative.At present, the detection modules that can collaborate with the Track moduleinclude the network quality analyzer (NQA) only. Refer to “Configure themaximum number of history records that can be saved in a test group” on page2029for details of NQA.Collaboration betweenthe Track Module andthe Application ModulesYou can establish the collaboration between the Track module and the applicationmodules through configuration. If the status of the Track object changes, the Trackmodule tells the application modules to deal with the change accordingly.At present, the application modules that can collaborate with the Track moduleinclude:■ VRRPTrackmoduleApplication modulesPolicy routingStatic routingBackup centerVRRPDetectionmodulesNQATrackmoduleApplication modulesPolicy routingStatic routingBackup centerVRRPDetectionmodulesNQA
