Before autoinstallation on a Services Router can take place, the router must acquire an IP address. The protocol or protocols you choose for IP address acquisition determine the router interface to connect to the network for autoinstallation. The router detects the connected interface and requests an IP address with a protocol appropriate for the interface. Autoinstallation is supported over an Ethernet LAN interface or a serial LAN or WAN interface. Table 41 lists the protocols that the router can use on these interfaces for IP address acquisition.
Table 41: Interfaces and Protocols for IP Address Acqusition During Autoinstallation
If the server with the autoinstallation configuration file is not on the same LAN segment as the new Services Router, or if a specific router is required by the network, you must configure an intermediate router directly attached to the new router, through which the new router can send Trivial File Transfer Protocol (TFTP), BOOTP, and Domain Name System (DNS) requests. In this case, you specify the IP address of the intermediate router as the location to receive TFTP requests for autoinstallation.