ppp keepalive [ seconds ]
no ppp keepalive
Command introduced before JUNOSe Release 7.1.0.
Specifies a keepalive value. The keepalive mechanism tracks the status of the connection. To restore the default of 30 seconds, enter ppp keepalive without a value. High-density mode is automatically selected when PPP is layered over ATM, tunnel, or PPPoE. Low-density mode is selected when PPP is layered over HDLC. The no version disables keepalive.
Interface Configuration, Profile Configuration, Subinterface Configuration