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Table 17: JUNOS Software Processes
DescriptionNameProcess
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
mgdManagement
process
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
chassisdChassis
process
Defines how routing protocols such as RIP, OSPF, and BGP operate on the router,
including selecting routes and maintaining fowarding tables.
rpdRouting
protocol
process
Supplies the programs that configure and monitor network interfaces by defining
physical characteristics such as link encapsulation, hold times, and keepalive timers.
dcdInterface
process (also
called device
control
process)
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.
fwddForwarding
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
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
configure the router. The J-Web interface also provides tools for monitoring,
managing, and diagnosing router operation.
■ Command-line interface (CLI)—Grants access to the complete JUNOS command
and configuration hierarchies, to monitor the router, diagnose problems, and
configure it completely.
Software Overview ■ 41
Chapter 2: System Overview