The built-in Gigabit Ethernet interfaces, ge-0/0/0 through ge-0/0/3, on the front panel of the Services Router, are the interfaces through which you perform initial router setup. The examples in this guide use the ge-0/0/0 interface as the management interface, but you can use any built-in Ethernet port for management. After the initial configuration is complete, you can attach the built-in Ethernet port that you are using for management purposes to the management network.
Before initial configuration, when the factory default configuration is active, the router attempts to perform autoinstallation by obtaining a router configuration through all its connected interfaces, including ge-0/0/0. The Services Router acts as a DHCP client out the built-in Ethernet interfaces.
If the Services Router does not find a DHCP server within a few seconds, it sets the address of ge-0/0/0 to 192.168.1.1/24 and becomes a DHCP server out the ge-0/0/0 interface.
Note: If the ge-0/0/1 interface is being used, it is set to 192.168.2.1/24.
With the router temporarily acting as a DHCP server, you can manually configure it with the J-Web interface. Any DHCP client host, for example, a PC or laptop computer, directly connected to ge-0/0/0 receives an address on the 192.168.1.1/24 network.
Note: The DHCP functionality for initial setup is different from the configurable DHCP server functionality of the Services Router during operation. To configure the Services Router as a DHCP server, see the JUNOS Software Administration Guide.
Once you connect your laptop or PC to ge-0/0/0, you can use a Web browser to visit the address 192.168.1.1/24, access the J-Web Set Up Quick Configuration page, and complete the initial configuration of the router.
After you perform the initial configuration and commit it by clicking Apply or OK on the Set Up page, the configured router can no longer act as a DHCP server. Therefore, to continue using ge-0/0/0 as a management interface you must configure the IP address of the interface as part of the initial configuration.