1. When a new ACX Series router is powered on for the first time, the router performs
the following autoinstallation tasks: The router boots the Junos OS image. The
management process (mgd) is invoked and it determines whether a valid configuration
exists on the router’s Flash memory. If a valid configuration is not present on the router,
it loads and commits the factory-default configuration.
2. If the factory-default configuration contains the autoinstallation configuration stanza
at the [edit system] hierarchy level, the autoinstallation process is triggered.
3. The autoinstallation process detects whether an external USB storage device is
connected to the router and examines whether the USB device contains a valid
configuration file. If the USB storage device contains a configuration file named
juniper-config.txt, the router reads the juniper-config.txt file and commits the
configuration.
4. If the juniper-config.txt file on the external USB storage device contains
continue-network-mode statement, the configuration is treated as partial configuration.
The autoinstallation process uses this partial configuration to obtain the complete
configuration file from a server on the network. At this stage, the router completes
the USB mode of the autoinstallation procedure and switches to the network mode
of the autoinstallation procedure.
NOTE: The continue-network-mode statement must be present in the
autoinstallation stanza at the [edit system autoinstallation] hierarchy level
of the juniper-config.txt file.
5. After acquiring the partial configuration from the juniper-config.txt file, the configuration
discovery procedure is initiated. For all physical Ethernet interfaces that transition to
the up state, the autoinstallation process verifies whether autoinstallation is configured
on that Ethernet interface. The autoinstallation process starts IP address acquisition
mechanism to obtain IP address of the server followed by the configuration file retrieval
mechanism.
6. For the interfaces that take part in the autoinstallation process, the IPv4 address
discovery procedure is triggered. The new ACX Series router sends out DHCP, or
BOOTP, or RARP requests on each connected interface simultaneously to obtain an
IP address. The interfaces statement in the autoinstallation configuration stanza at
the [edit system] hierarchy level in the factory-default configuration also specify the
protocols to be used for IPv4 address discovery. If the interfaces statement is not
configured, all the applicable protocols for an interface are used to send out requests
on each connected Ethernet interface.
7. If an IPv4 address cannot be retrieved, the autoinstallation process starts the DHCP
server on all participating interfaces (assigns static IP address in the form of 192.168.x.1
to allow a management station to connect to the router for manual configuration)
and terminates the autoinstallation procedure.
8. If a DHCP server responds, it provides the router with some or all of the following
information:
85Copyright © 2017, Juniper Networks, Inc.
Chapter 3: Configuring Autoinstallation
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