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Routing Engine Ar
chitecture
Figure 13: Packet Forwarding Engine Components and Data Flow
1335
= ASIC
Routing
Engine
Midplane
PIC
Controller
PIC
Controller
Packet
out
Packet
in
Distributed
Buffer
Manager
Distributed
Buffer
Manager
FEB
Internet
Processor
II
I/O
Manager
Routing E
ngine Architecture
The Routing Engine is an Intel-based PCI platform running the JUNOS Internet software,
which Ju
niper Networks has developed and optimized to handle large numbers of network
interfaces and routes. The software consists of a set of system processes running in protected
memory modules on top of an independent operating system. The JUNOS kernel supports
JUNOS sy
stem processes, which handle system management processes, routing protocols,
and control functions (see Figure 14).
The Rout
ing Engine has a dedicated 100-Mbps intern al connection to the Packet Forwarding
Engine.
System Architecture Overview
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