The tmnxVrrpOperInUseAdvInterval specifies the operational value
for the advertisement interval.
When the VRRP instance is operating as a master, the value
of tmnxVrrpOperInUseAdvInterval is the same as the value of
vrrpOperAdvertisementInterval.
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
tmnxVrrpOperInUseAdvInterval is the same as the value of
vrrpOperAdvertisementInterval.
To get the total interval time, add the value for tmnxVrrpOperInUseAdvInterval
in seconds and tmnxVrrpOperInUseAdvIntlMilSec in milliseconds.
Only the master router sends VRRP advertisements.