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RE-PTX-X8-128G Routing Engine Description


RE-PTX-X8-128G Routing Engine Components

The RE-PTX-X8-128G Routing Engine has increased memory and storage to support virtualization. The Routing Engine is equipped with an 8 Core 2.3 GHz processor, 128GB Memory, and two 200GB SSDs. It also supports Secure Boot for enhanced boot security.

Figure 1: RE-PTX-X8-128G Routing Engine Components
RE-PTX-X8-128G Routing Engine Components
Extractor clips
RESET button
USB0 and USB1 ports
SSD card slot cover

Each Routing Engine (shown in Figure 1) consists of the following components:

  • CPU—Runs Junos OS to maintain the routing tables and routing protocols. The CPU is an eight-core CPU with core frequency of 2.3 GHz.

  • DRAM—Provides storage for the routing and forwarding tables and for other Routing Engine processes.

  • EEPROM—Stores the serial number of the Routing Engine.

The faceplate of the Routing Engine contains the following:

  • Two USB ports USB0 and USB1—Provide a removable media interface through which you can install Junos OS manually. Junos OS supports USB versions 3.0, 2.0, and 1.1.

  • Two solid-state drive slots for the primary SSD SSD1 and the secondary SSD SSD2—Provide storage for software images, configuration files, microcode, log files, and memory dumps. The Routing Engine reboots the system from SSD2 when booting from SSD1 fails.

  • RESET button—Reboots the Routing Engine when pressed.

  • ONLINE/OFFLINE button—Takes the Routing Engine offline or brings it online when pressed.


    The ONLINE/OFFLINE button must be pressed for a minimum of 4 seconds for the power off or power on to occur.

  • Extractor clips—Control the locking system that secures the Routing Engine.

  • LEDs—PTX5000 Routing Engine LEDs describes the functions of these LEDs.


For specific information about Routing Engine components (for example, the amount of DRAM), issue the show chassis routing-engine command.

RE-PTX-X8-128G Routing Engine Boot Sequence

Booting in a RE-PTX-X8-128G Routing Engine follows this sequence—the USB device, SSD1, SSD2, LAN. SSD1 is the primary boot device. The boot sequence is tried twice for SSD1 and SSD2.

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