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MX960 Routing Engine Description

If the host system is redundant, the backup Routing Engine is hot-removable and hot-insertable, but the primary Routing Engine is hot-pluggable. A Routing Engine that is not redundant is hot-pluggable.

Supported Routing Engines

See MX960 Routing Engines to know about the Routing Engines supported by the MX960 router.


If two Routing Engines are installed, they must both be the same hardware model.

Routing Engine Function

The Routing Engine runs the Junos OS. Software processes that run on the Routing Engine 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.

Routing Engine Slots

You can install one or two Routing Engines in the router. Each Routing Engine must be installed directly into an SCB. A USB port on the Routing Engine accepts a USB memory device that allows you to load Junos OS. The Routing Engines install into the front of the chassis in vertical slots directly into the SCBs labeled 0 and 1. If two Routing Engines are installed, one functions as the primary and the other acts as the backup. If the primary Routing Engine fails or is removed and the backup is configured appropriately, the backup takes over as the primary.

On the MX960 router, a Routing Engine installed in SCB slot 2/6 receives no power and supplies no additional routing functions. If no SCB is installed in slot 2/6, install a blank panel in the slot.

Routing Engine Interface Ports

Three ports, located on the right side of the routing engine, connect the Routing Engine to one or more external devices on which system administrators can issue Junos OS command-line interface (CLI) commands to manage the router.

The ports with the indicated labels 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 or MGMT—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-Mbps or 100-Mbps connections. Two small LEDs on the right of the port indicate the connection in use: the LED flashes yellow or green for a 10-Mbps or 100-Mbps connection, and the LED is light green when traffic is passing through the port.