Setting the PTP Announce Interval

To set the interval at which an interface sends PTP announce messages, use the ptp announce interval command. The interval is measured in log seconds. This value also affects the timeout interval.

This command configures the interval between PTP announcement messages on interface ethernet 5 to 4 seconds.
switch(config)# interface ethernet 5
switch(config-if-Et5)# ptp announce interval 2
switch(config-if-Et5)#