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System Overview

Table 12: JUNOS Software Processes

Process Name Description

Management

process

mgd Manages the Services Router system as follows:

Provides communication between the other processes and an interface to

the configuration database

Populates the configuration database with configuration information and

retrieves the information when queried by other processes to ensure that

the system operates as configured

Interacts with the other processes when commands are issued through one

of the user interfaces on the router

Chassis

process

chassisd Controls a Services Router chassis and its components as follows:

Detects hard

ware on the system that is used to configure network interfaces

Monitors the physical status of hardware components and field-replaceable

units (FRUs)

, detecting when environment sensors such as temperature

sensors are triggered

Relays signa

ls and interrupts—for example, when devices are taken offline,

so that the system can close sessions and shut down gracefully

Routing

protocol

process

rpd Defines how routing protocols such as RIP, OSPF, and BGP operate on the router,

including selecting routes and maintaining fowarding tables.

Interface

process

(also c alled

device control

process)

dcd Supplies the programs that configure and monitor network interfaces by defining

physical characteristics such as link encapsulation, hold times, and keepalive timers.

Forwarding

process

fwdd Responsible for most of the packet transmission through a Services Router. The

overall performance of the router is largely determined by the effectiveness of the

forwarding process.

User Interfaces

The user interfaces on a Services Router interact with the management process

to execute com mands and store and retrieve information from the configuration

database. The user interfaces operate as clients that communicate with the JUNOS

Internet software through an a pplication programming interface (API).

The following primary user interfaces are shipped with the router:

J-Web graphical use r interface—Includes quick configuration capabilities for

performing the m inimum required steps to enable a feature, plus a built-in

configuration editor with a ccess to the entire configuration hierarchy to fully

Software Overview 25

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