The tmnxVrrpOperInUseAdvIntlMilSec indicates the operational value for the advertisement millisecond interval. When the VRRP instance is operating as a master, the value of tmnxVrrpOperInUseAdvIntlMilSec is the same as the value of tmnxVrrpOperAdvIntervalMilSec. When the VRRP instance is operating as a backup and the value of tmnxVrrpOperAdvIntervalInherit is set to 'true', the total value of tmnxVrrpOperInUseAdvInterval and tmnxVrrpOperInUseAdvIntlMilSec equals the value in the advertisement interval field of the VRRP Advertisement message received from the current master. When the VRRP instance is operating as a backup and the value of tmnxVrrpOperAdvIntervalInherit is set to 'false', the value of tmnxVrrpOperInUseAdvIntlMilSec is the same as the value of tmnxVrrpOperAdvIntervalMilSec. To get the total interval time, add the value for tmnxVrrpOperInUseAdvInterval in seconds and tmnxVrrpOperInUseAdvIntlMilSec in milliseconds. Only the master router sends VRRP advertisements.