Re-Mx2000-1800X4 Cb-Re Software; Re-Mx2000-1800X4 Cb-Re Boot Sequence; Mx2000 Host Subsystem Cb-Re Description | 49 - Juniper MX2020 Hardware Manual

Interface ports—The AUX, CONSOLE, and MGMT ports provide access to management devices. Each
CB-RE 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. The two ports labeled XGE-0 and XGE-1 are used for hardware diagnostics and are for
Juniper-internal use only. The ExtClk ports provide access to external timing distribution.
EEPROM—Stores the serial number of the CB-RE.
Reset button—Reboots the Routing Engine on the CB-RE when pressed.
Online/Offline button—Takes the Routing Engine on the CB-RE online or offline when pressed.
LEDs—Provide status of the Routing Engine on the CB-RE.

RE-MX2000-1800x4 CB-RE Software

The RE-MX2000-1800x4 CB-RE runs Junos OS. Software processes that run on the CB-RE maintain the
routing tables, manage the routing protocols used on the router, control the router interfaces, control
some chassis components, and provide the interface for system management and user access to the router.

RE-MX2000-1800x4 CB-RE Boot Sequence

The router is shipped with the Junos OS pre-installed on the CB-RE. There are three copies of software:
One copy on a USB flash drive that can be inserted into the slot on the CB-RE faceplate.
One copy on the CompactFlash card in the Routing Engine.
One copy on the Solid State Disk (SSD) in the CB-RE.
NOTE: The SSD is internal and cannot be removed.
The Routing Engine interface boots from the storage media in this order: the USB device (if present), then
the CompactFlash card, then the SSD, and then the LAN. Normally, the router boots from the copy of the
software on the CompactFlash card.
RELATED DOCUMENTATION
RJ-45 Connector Pinouts for MX Series CB-RE Auxiliary and Console Ports | 155
RJ-45 Connector Pinouts for an MX Series CB-RE or RCB Management Port | 156
Removing a CB-RE from an MX2000 Router

MX2000 Host Subsystem CB-RE Description | 49

53