CA Performance Management is designed to just read the current Tests on the device and collect data on them. We added the ability to create Tests from CA Performance Management directly to the device using the Data Aggregator REST API; but we don't store the Test configuration in CA Performance Management.
When the RTT Tests are in the router’s running config (which is non-persistent) and the device is rebooted, all the Tests would be lost.
With the Data Aggregator REST API we set the SNMP MIB variable “rttMonCtrlAdminNvgen” to true, so that the Tests are written to the router’s running config; this is the way to allow users to save the running config to the NVRAM (startup config), which is persistent.
When the rttMonCtrlAdminNvgen MIB variable is set to true, its associated operation is shown in the output of the show running command and therefore can be saved in “nonvolatile memory (NVRAM)”. The default value for variable rttMonCtrlAdminNvgen is false.
Setting this variable to true alone doesn't mean it's persistent, it means Test can be made persistent by the user. If false, user will never be able to make the Test persistent.
User must manually save running config to NVRAM startup config to preserve Tests across router’s restart.
On CA Performance Center, these RTT Test items should show missing statistics data only during the router reload time. After that the Items will shows data again.