Description: This attribute specifies the time interval between the successive testson different destinations. The automatic route tester periodically tries to test the route to a different reachable destination (RID or MID). In order not to put too heavy a load on the network, it will wait for a period of time equal to this interval before it will start working on another destination.

The smaller the value of this attribute, the more frequently the automatic route tester gets invoked to work on route testing. On one hand, doing so will reduce the amount of time needed to complete a fully cycle of route testing to every reachable destination. One the other hand, this will increase the resource comsumption of the automatic route tester accordingly.

During each testInterval, the automatic route tester will first retry the routes to each error destination, if any, to see if they have recovered. After the retries of all these error destinations, another RID/MID destination from the DPN routing table (not in the error destination list) will be chosen to conduct route testing only if the current number of error destinations is less than 10. If the number of error destinations has reached 10, no other destinations will be chosen and the automatic route tester will focus on retrying only these error destinations at each testInterval. However, if the routes to at least one error destination has recovered or has become unreachable, the number of error destinations will fall below 10, and the selection and conducting of route testing on another destination from the DPN routing table will resume.