Juniper-networks J4350 Manuel d'utilisateur télécharger pdf (Page 44)

J4350 and J6350 Services Router Getting Started Guide

Routing Engine and Packet Fo rwarding Engine on page 24

Kernel and M ic rokernel o n page 24

JUNOS Softwar

e P rocesses on page 24

User Interfaces on page 25

Routing Engine and Packet Forwarding Engine

A Services Router has two primary software processing components:

Routing Engine—C reates and maintains the routing tables that determin e h ow

packets are routed through the network.

Packet Forwarding Engine— Processes packets; applies filters, routing policies,

and other feat

ures; and forwards packets to the next hop along the route

to their final destination.

For information about Routing Engine hardware, see “Routing Engine” on page 14.

Kernel and Mi

crokernel

The Routing E

ngine kernel provides the underlying infrastructure for all

JUNOSsoftwareprocessesbydoingthefollowing:

Linking the routing tables maintained by the routing protocol process with the

forwarding table maintained by the Routing Engine

Coordinating co mmunication with the Packet Forwarding Engine, prim arily

by synchron

izing the Packet Forwarding Engine’s forwarding table with the

master forwarding table maintained by the Routing Engin e

The microkernel contains device drivers an d processes that the Packet Forwarding

Engine uses to govern the flow of packets through the Services Router.

JUNOS S oftware Processes

The JUNOS software runnin g o n th e Routing Engine a nd Packet

ForwardingEngineconsistsofmultiple processes that are responsible

for indivi

dual S ervices Router functions.

The separa

tion of functions provides operational stability, because each

process accesses its own protected memory space. In a ddition, because

each process is a separate software package, you can selectively upgrade

all or part

of the JUNOS software, for added flexibility.

Ta b l e 1 2 d e

scribes the primary JUNOS software processes.

24 Software Overview

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Juniper-networks J4350 Manuel d'utilisateur Page 44