Srx5K-Re-1800X4 Routing Engine Boot Sequence; Routing Engine Srx5K-Re-1800X4 Specifications - Juniper SRX5400 Hardware Manual

The ports function as follows:
AUX–Connects the Routing Engine to a laptop, modem, or other auxiliary device through a serial cable
with an RJ-45 connector.
CONSOLE–Connects the Routing Engine to a system console through a serial cable with an RJ-45
connector.
ETHERNET–Connects the Routing Engine through an Ethernet connection to a management LAN (or
any other device that plugs into an Ethernet connection) for out-of-band management. The port uses
an autosensing RJ-45 connector to support 10/100/1000 Mbps connections. Two small LEDs on the
bottom of the port indicate the connection in use: the LED flashes yellow or green for a 10/100/1000
Mbps connection, and the LED is light green when traffic is passing through the port.
The solid-state drive (SSD) slots located on the Routing Engine provide secondary storage for log files, for
generating core files, and for rebooting the system if the CompactFlash card fails. Currently,
SRX5K-RE-1800X4 only supports one 128-GB SSD.

SRX5K-RE-1800X4 Routing Engine Boot Sequence

The services gateway is shipped with three copies of the Junos OS preinstalled on the Routing Engine in
the following locations:
On the CompactFlash card in the Routing Engine
On the SSD in the Routing Engine
On a USB flash drive that can be inserted into the slot on the Routing Engine faceplate
The Routing Engine boots from the storage media in this order: the USB device (if present), the CompactFlash
card, the solid-state drive (SSD), and then the LAN. Normally, the services gateway boots from the copy
of the software on the CompactFlash card.

Routing Engine SRX5K-RE-1800X4 Specifications

Each Routing Engine consists of the following components:
CPU—Runs Junos OS to maintain the routing tables and routing protocols.
DRAM—Provides storage for the routing and forwarding tables and for other Routing Engine processes.
USB port—Provides a removable media interface through which you can install the Junos OS manually.
Junos OS supports USB version 1.0 and 2.0.
CompactFlash card—Provides primary storage for software images, configuration files, and microcode.
The CompactFlash card is fixed and is inaccessible from outside the device.
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