The aluPtpPortDSLogAnnoInterval represents the mean time interval between successive Announce messages. The interval is specified as the logarithm to the base 2 of the time interval in seconds. For example the default value of 1 corresponds to an Announce interval of 2 seconds. The default value of aluPtpPortDSLogAnnoInterval depends on the value of aluPtpClockProfile. The defaults and the allowed ranges are defined in the below table: aluPtpClockProfile | default | range 'ituTelecomFreq (1)'| 1 | -3..4 'ieee1588-2008 (2)' | 1 | -3..4 'g8275dot1-2014 (3)'| -3 | -3..4 'g8275dot2-2016 (4)'| 1 | -3..4 For ordinary slave and boundary clocks utilizing unicast negotiations, this is the rate at which a ptp-port will request Announce messages from the remote PTP clock. The aluPtpPortDSLogAnnoInterval it also determines how often the Best Master Clock Algorithm (BMCA) is run. For example on an ordinary clocks with the aluPtpPortDSLogAnnoInterval set to 3, the BMCA would be run once every 8 seconds. On boundary clocks the ptp-port with the smallest aluPtpPortDSLogAnnoInterval would be used to determine how often the BMCA is run.