Figure 14: USB Memory Device in an 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 two solid state drives (SSD) and then the LAN.
The device from which the router boots is called the primary boot device, and the other
device is the alternate boot device.
NOTE: If the router boots from an alternate boot device,a yellow alarmlights
the LED on the router’s craft interface.
Related
Documentation
• M120 Routing Engine Description on page 22
• M120 Host Subsystem Description on page 21
• Taking the M120 Host Subsystem Offline on page 267
• Supported Routing Engines by Router on page 33
RE-A-1800 Routing Engine LEDs
Each Routing Engine has four LEDs that indicate its status. The LEDs, labeled MASTER,
STORAGE, ONLINE, and OK/FAIL, are located directly on the faceplate of the Routing
Engine. Table 10 on page 28 describes the functions of the Routing Engine LEDs.
27Copyright © 2018, Juniper Networks, Inc.
Chapter 5: Host Subsystem Components and Descriptions
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