Table 22: Junos Os Processes - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Table 22: Junos OS Processes

Process Name
Chassis process chassisd
Ethernet eswd
switching
process
Forwarding pfem
process
Interface dcd
process
Management mgd
process
Routing protocol rpd
process
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Copyright © 2010, Juniper Networks, Inc.
The separation of functions provides operational stability, because each process accesses
its own protected memory space. In addition, because each process is a separate software
package, you can selectively upgrade all or part of the Junos OS, for added flexibility.
Table 22 on page 27 describes the primary Junos OS processes.
Description
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.
Handles Layer 2 switching functionality such as MAC address learning, Spanning Tree
protocol and access port security. The process is also responsible for managing Ethernet
switching interfaces, VLANs, and VLAN interfaces.
Manages Ethernet switching interfaces, VLANs, and VLAN interfaces.
Defines how routing protocols operate on the switch. The overall performance of the
switch is largely determined by the effectiveness of the forwarding process.
Configures and monitors network interfaces by defining physical characteristics such
as link encapsulation, hold times, and keepalive timers.
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 switch.
If a process terminates or fails to start when called, the management process attempts
to restart it a limited number of times to prevent thrashing and logs any failure
information for further investigation.
Defines how routing protocols such as RIP, OSPF, and BGP operate on the device,
including selecting routes and maintaining forwarding tables.
For more information about basic system parameters, supported protocols, and software
processes, see the Junos OS System Basics Configuration Guide.
Chapter 1: Software Overview
27