Routing Engine

The Routing Engine consists of an Intel-based PCI platform running the Junos OS. The Routing Engine maintains the routing tables used by the router in which it is installed and controls the routing protocols on the router. The T640 routing node, and the T320, M160, M40e, and M20 routers support up to two Routing Engines, while the M40, M10, and M5 routers support a single Routing Engine.

Each Routing Engine consists of a CPU; SDRAM for storage of the routing and forwarding tables and other processes; a compact flash disk for primary storage of software images, configuration files, and microcode; a hard disk for secondary storage; a PC card slot (on some M40 routers, a floppy disk) for storage of software upgrades; and interfaces for out-of-band management access.