The Routing Engine maintains the routing tables and controls the routing protocols, as well as the JUNOS software processes that control the router's interfaces, the chassis components, system management, and user access to the router.This product is a routing engine board with 600 MHz Pentium III, 2048 MB DRAM, 256 MB flash drive, 30 GB hard disk drive (included in M40eBASE-DC price). Requires JUNOS 5.4 or later.