Routing Engine Boot Sequence; Figure 11: Usb Memory Device In An M120 Routing Engine - Juniper Networks Hardware Manual

M120 Multiservice Edge Router Hardware Guide
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Interfaces for out-of-band management access—Provide information about
Routing Engine status to devices (console, laptop, or terminal server) that can be
attached to access ports located on the craft interface.
Each Routing Engine has one 10/100-Mbps Ethernet port for connecting to a
management network, and two asynchronous serial ports—one for connecting to a
console and one for connecting to a modem or other auxiliary device.
EEPROM—Stores the serial number of the Routing Engine.
Reset button—Reboots the Routing Engine when pressed.
Offline button—Takes the Routing Engine offline when pressed.
Extractor clips—Control the locking system that secures the Routing Engine.
NOTE: For specific information about Routing Engine components (for
example, the amount of DRAM), issue the
command.

Figure 11: USB Memory Device in an M120 Routing Engine

Routing Engine Boot Sequence

The Routing Engine boots from the storage media in this order: the USB device, then the
CompactFlash card (if present), then the hard disk, then the LAN. The disk from which
the router boots is called the primary boot device, and the other disk is the alternate boot
device.
NOTE: If the router boots from an alternate boot device, a yellow alarm lights
the LED on the router's craft interface.
show chassis routing-engine
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