Juniper Networks J-Series - Manual (Page 106)

2. After the new Services Router acquires an IP address, the autoinstallation process
on the router attempts to download a configuration file in the following ways:
a. If the DHCP server specifies the host-specific configuration file (boot file)
hostname.conf , the router uses that filename in the TFTP server request. (In
the filename, hostname is the hostname of the new router.) The
autoinstallation process on the new router makes three unicast TFTP requests
for
hostname.conf . If these attempts fail, the router broadcasts three requests
to any available TFTP server for the file.
b. If the new router cannot locate hostname.conf , the autoinstallation process
unicasts or broadcasts TFTP requests for a default router configuration file
called
network.conf , which contains hostname-to-IP address mapping
information, to attempt to find its hostname.
c. If network.conf contains no hostname entry for the new Services Router, the
autoinstallation process sends out a DNS request and attempts to resolve
the new router's IP address to a hostname.
d. If the new Services Router can determine its hostname, it sends a TFTP
request for the
hostname.conf file.
e. If the new Services Router is unable to map its IP address to a hostname, it
sends TFTP requests for the default configuration file
router.conf .
3. After the new Services Router locates a configuration file on a TFTP server,
autoinstallation downloads the file, installs the file on the router, and commits
the configuration.
Before You Begin
To configure a network for Services Router autoinstallation, complete the following
tasks:
■ Configure a DHCP server on your network to meet your network requirements.
You can configure a Services Router to operate as a DHCP server. For more
information, see “Configuring the Router as a DHCP Server” on page 63.
■ Create one of the following configuration files, and store it on a TFTP server in
the network:
■ A host-specific file with the name hostname.conf for each Services Router
undergoing autoinstallation. Replace hostname with the name of a Services
Router. The hostname.conf file typically contains all the configuration
information necessary for the router with this hostname.
■ A default configuration file named router.conf with the minimum configuration
necessary to enable you to telnet into the new Services Router for further
configuration.
■ Physically attach the Services Router to the network using one or more of the
following interface types:
■ Fast Ethernet
84 ■ Before You Begin
J-series™ Services Router Administration Guide