Internet Router Hardware Guide

Chapter 3
JUNOS Internet Software Overview
The JUNOS Internet software is especially designed for the large production
networks typically supported by Internet Service Providers (ISPs). It incorporates
Internet Protocol (IP) routing software and software for management of interfaces,
networks, and the router chassis.
TheJUNOSInternetsoftwarerunsontheRoutingEngine.Thesoftwareconsistsof
processes that support Internet routing protocols, control the router’s interfaces
and the router chassis itself, and provide an interface for system management.
The processes run on top of a kernel that coordinates the communication among
processes and has a direct link to the Packet Forwarding Engine software.
Use the JUNOS Internet software to configure the routing protocols that run on
the router and the properties of router interfaces. After you have activated a
software configuration, use the JUNOS Internet software to monitor the protocol
traffic passing through the router and to troubleshoot protocol and network
connectivity problems.
For additional information about the JUNOS Internet software, including its security
features and a list of the industry standards it supports, see the JUNOS System Basics
Configuration Guide. F or complete information about configuring the software,
including examples, see the JUNOS Internet software configuration guides.
This chapter discusses the following topics:
Routing Engine Software Components on page 43
Tools for Accessing and Configuring the Software on page 50
Tools for Monitoring the S oftware on page 50
Software Upgrades on page 50
Routing Engine Software Components
The Routing Engine software consists of several software processes that control
router functions and a kernel that coordinates communication among the
processes, as described in the following sections:
Routing Protocol Process on page 44
Routing Engine Software Components 43