Network Router User Manual

■ CPU—Runs JUNOS Internet software to maintain the router's routing tables and
routing protocols. It has a Pentium-class processor.
■ SDRAM—Provides storage for the routing and forwarding tables and for other
Routing Engine processes.
■ Internal flash drive—This drive is optional. If installed, it provides primary storage.
It holds software images, configuration files, and microcode.
■ Hard disk—If no internal flash drive is installed, provides primary storage for
software images, configuration files, and microcode. If an internal flash drive is
installed, the hard disk provides secondary storage for log files and memory
dumps, and can reboot the system if the internal flash drive fails.
■ PC card slot—Accepts a removable PC card, which stores software images for
system upgrades.
■
Four LEDs—A green LED labeled HDD, a blue LED labeled MASTER, a red LED
labeled FAIL, and a green LED labeled ONLINE indicate Routing Engine status.
Table 8 on page 16 describes the LED states.
■ 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 Routing Engine.
■ I
2
C/EEPROM—Stores the serial number of the Routing Engine.
■ Reset button—Reboots the Routing Engine when pressed.
■ Offline button—Powers down the Routing Engine when pressed.
■ Thumbscrews—Secure the Routing Engine in the chassis.
NOTE: The appearance and position of electronic components or the PC card slot
on your Routing Engine might differ from Figure 5 and other figures in this document
that depict the Routing Engine. These differences do not affect Routing Engine
installation and removal or functionality.
NOTE: For specific information about Routing Engine components (for example, the
capacity of the hard drive), issue the show chassis routing-engine command.
Routing Engine ■ 15
Chapter 2: Hardware Component Overview