Autoinstallation can take place through either a management interface or a serial interface on the Services Router. If a LAN interface with High-level Data Link Control (HDLC) encapsulation is found on the Services Router, autoinstallation attempts to obtain an IP address using DHCP requests, bootstrap protocol (BOOTP), or Reverse Address Resolution Protocol (RARP) requests.
If a serial interface with Frame Relay encapsulation is connected, then the Services Router attempts to obtain an IP address using BOOTP requests. On a serial interface without Frame Relay encapsulation, the Services Router uses Serial Line Address Request Protocol (SLARP).