After you configure an interface for PPP or Cisco HDLC encapsulation in the interface's Basic Properties, you can configure keepalive options.
To configure PPP keepalive options, click PPP.
To configure Cisco HDLC keepalive options, click Cisco HDLC.
After you create a multilink interface and configure it for MLPPP encapsulation, you can configure MLPPP options for the bundle.
To configure MLPPP options, click MLPPP.