sfpsMcastConfigApiRefreshInterval 1.3.6.1.4.1.52.4.2.4.2.5.4.1.7

This is the interval at which sender announcements will be transmitted by the switch that the sender is locally attached. All sender refreshes will occur within 12 seconds. If this number is set to 60, 1/2 of the senders will be announced every 60 seconds. If this number is 30, 1/4 of the senders will be announced every 30 seconds. If the number of senders grows, the refresh interval may have to be adjusted shorter. The fine tuning is to determine which is better, fewer-bigger announcements, or more-smaller announcements. Value will not take effect until blade is reset.