Cisco Frame Relay interface will send 6 keeps of exchanges before requesting a full status message.
This is done by keepalive packets. Every 10 seconds, it sends out a keepalive message, and every 60 seconds (6 times of keepalives), it requests a full status message.
If not allowed to change the keepalive, you can use 'frame-relay lmi-n391dte keep-exchanges' command to change the number of keepalives to request the full status message.
For example, if you are required to change the full status message interval to 180 seconds, and you are not allowed to change the keepalive interval, you can change the keep-exchanges to 18 using 'frame-relay lmi-n391dte 18'.
