Supported Autoinstallation Interfaces And Protocols; Typical Autoinstallation Process On A New Router - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Supported Autoinstallation Interfaces and Protocols

Typical Autoinstallation Process on a New Router

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Before autoinstallation on a router can take place, the router must acquire an IP address
or a USB key. 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. For IP address
acquisition, the ACX Series router uses DHCP, BOOTP, or Reverse Address Resolution
Protocol (RARP) on an Ethernet LAN interface.
If the server with the autoinstallation configuration file is not on the same LAN segment
as the new 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 HTTP, FTP, 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 HTTP, FTP, or TFTP requests for autoinstallation.
When a router is powered on for the first time, it performs the following autoinstallation
tasks:
The new router sends out DHCP, BOOTP, or RARP requests on each connected
1.
interface simultaneously to obtain an IP address.
If a DHCP server responds, it provides the router with some or all of the following
information:
An IP address and subnet mask for the autoinstallation interface.
The location of the TFTP (typically), Hypertext Transfer Protocol (HTTP), or FTP
server on which the configuration file is stored.
The name of the configuration file to be requested from the HTTP, FTP, or TFTP
server.
The IP address or hostname of the HTTP, FTP, or TFTP server.
If the DHCP server provides only the hostname, a DNS server must be available on
the network to resolve the name to an IP address.
The IP address of an intermediate router if the configuration server is on a different
LAN segment from the new router.
After the new router acquires an IP address, the autoinstallation process on the router
2.
attempts to download a configuration file in the following ways:
If the configuration file is specified as a URL, the router fetches the configuration
a.
file from the URL by using HTTP, FTP, or TFTP depending on the protocol specified
in the URL.
If the DHCP server specifies the host-specific configuration file (boot file)
b.
hostname.conf , the router uses that filename in the TFTP server request. (In the
filename, is the hostname of the new router.) The autoinstallation process
hostname
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