Juniper Networks J4350 - Manual (Page 45)

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 hardware 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 signals 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 called
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 commands and store and retrieve information from the configuration
database. The user interfaces operate as clients that communicate with the JUNOS
Internet software through an application programming interface (API).
The following primary user interfaces are shipped with the router:
J-Web graphical user interface—Includes quick configuration capabilities for
performing the minimum required steps to enable a feature, plus a built-in
configuration editor with access to the entire configuration hierarchy to fully
Software Overview 25