System Architecture Overview
Figure 23: Packet Forwarding Engine Componentsand Data Flow
1234
= ASIC
Distributed
Buffer
Manager
SFM
Routing
Engine
Internet
Processor II
Packet
Director
FPC
I/O
Manager
Packet
in
Packet
out
PIC
Controller
Midplane
Routing Engine Architecture
The Routing Engine is an Intel-based PCI platformrunning the JUNOS Internet
software, which Juniper Networks has developed and optimized to handle
large numbers of network interfacesand routes. The software consists of
a set of system processes runningin protected memory modules on top
of an independent operating system. The JUNOS kernel supports JUNOS
system processes, whichhandle system management processes, routing
protocols, and control functions(see Figure 24).
The Routing Engine has a dedicated 100-Mbps in ternal connection
to the Packet Forwarding Engine.
Routing Engine Architecture 53