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List of Junos OS Processes

 

Junos OS consists of multiple processes that run on different platforms and have unique functions. The separation of functions provides operational stability, because each process accesses its own protected memory space.

Table 1 describes the processes that run only on MX Series 5G Universal Routing Platforms.

Table 1: Junos OS Processes on MX Series Platform Only

Process

Name

Description

Clksync process (RE)

clksyncd

Defines the operation of synchronous Ethernet and Precision Time Protocol (PTP) on a Juniper Networks MX Series router. The operation includes communication with the Packet Forwarding Engine (clock-sync module) to program and process clock events from the EEC clock.

Operates the PTP stack, exchanges packets, and handles the configuration changes for the modular MX Series (MX80).

Controls the configuration and monitoring of the overall operation of the PTP functionality for chassis-based MX Series platforms (MX240, MX480, and so on).

Clock-sync process (PFE)

clock-sync

Programs and monitors the modular interface card (MIC), the CPLD, and the EEC clock. Peer of the clksyncd process module.

Captures all PTP and Synchronous Ethernet statistics on the Packet Forwarding Engine and provides them to the Routing Engine.

Interchassis communication process

iccpd

Exchanges proprietary Junos OS messages between two Juniper Networks MX Series routers that take part in a multichassis link aggregation group (LAG).

Statistics agent process

stats-agentd

Acts as a relay process to collect interface statistics for all software development kit (SDK) applications.

Interacts with the pfed process to collect the logical interface statistics for SDK applications.

Table 2 lists all the other processes that are common across platforms.

Table 2: Junos OS Processes

Name

Process

Description

Adaptive services process

adaptive-services

Manages the configuration for stateful firewall, Network Address Translation (NAT), intrusion detection service (IDS), and IP Security (IPsec) services on the Adaptive Services PIC.

Alarm control process

alarm-control

Configures the system alarm.

Access Node Control Protocol (ANCP) process

ancpd-service

Works with a special Internet Group Management Protocol (IGMP) session to collect outgoing interface mapping events in a scalable manner.

Application identification process

application-identification

Identifies an application using intrusion detection and prevention (IDP) to allow or deny traffic based on applications running on standard or nonstandard ports.

RADIUS accounting process

audit-process

Gathers statistical data that can be used for general network monitoring, analyzing, and tracking usage patterns, for billing a user based upon the amount of time or type of services accessed.

Auto-configuration process

auto-configuration

Configures interfaces automatically.

Boot process

bootp

Enables a router, switch, or interface to act as a Dynamic Host Configuration Protocol (DHCP) or bootstrap protocol (BOOTP) relay agent. DHCP relaying is disabled.

Captive portal content delivery process

captive-portal-content-delivery

Specifies the location to which a subscriber's initial Web browser session is redirected, enabling initial provisioning and service selection for the subscriber.

Universal Edge Layer 2 Tunneling Protocol process

ce-l2tp-service

(M10, M10i, M7i, and MX Series routers only) Establishes L2TP tunnels and Point-to-Point Protocol (PPP) sessions through L2TP tunnels.

Ethernet OAM connectivity fault management process

cfm

Monitors the physical link between two switches.

Chassis control process

chassis-control

Manages the chassis.

Class of service process

class-of-service

Controls the router's or switch’s CoS configuration.

Ethernet clock synchronization process

clksyncd-service

Uses Synchronous Ethernet (SyncE) for external clock synchronization .

Craft interface I/O control process

craft-control

Controls the I/O of the craft interface.

Database replication process

database-replication

(EX Series switches and MX Series routers only) Manages the replication of updates from the master to the slave in the database management system.

Datapath trace process

datapath-trace-service

Traces the path taken by the packet through the network.

Dynamic Host Configuration Protocol process

dhcp-service

(EX Series switches and MX Series routers only) Enables a DHCP server to allocate network IP addresses and deliver configuration settings to client hosts without user intervention.

Diameter process

diameter-service

Implements the Diameter protocol which uses the Transmission Control Protocol (TCP) and Stream Control Transmission Protocol (SCTP) instead of User Datagram Protocol (UDP), for monitoring the network.

Disk monitoring process

disk-monitoring

Checks the health of the hard disk drive on the Routing Engine.

Dynamic flow capture (DFC) process

dynamic-flow-capture

Controls the DFC configurations on Monitoring Services III PICs.

ECC parity errors logging process

ecc-error-logging

Logs the ECC parity errors into the memory on the Routing Engine.

Connectivity fault management (CFM) process

ethernet-connectivity-fault-management

Provides IEEE 802.1ag OAM CFM database information for CFM maintenance association end points (MEPs) in a CFM session.

Ethernet OAM Link-Fault-Management process

ethernet-link-fault-management

(EX Series switches and MX Series routers only) Provides the OAM link fault management (LFM) information for Ethernet interfaces.

Event processing process

event-processing

or

eventd

Configures the application to handle all generated events.

Firewall process

firewall

Manages the firewall configuration and enables accepting or rejecting packets that are transiting an interface on a router or switch.

General authentication process

general-authentication-service

(EX Series switches and MX Series routers only) Manages general authentication of a user.

Inter-Chassis Communication Protocol (ICCP) process

iccp-service

Synchronizes data within a set of two (or more) PEs that form a redundancy group (RG).

IDP policy process

idp-policy

Enables various attack detection and prevention techniques on traffic traversing the network.

Integrated Local Management Interface process

ilmi

Provides bidirectional exchange of management information between two Asynchronous Transfer Mode (ATM) interfaces across a physical connection.

Inet process

inet-process

Configures the IP multicast family.

Init process

init

Initializes the USB modem.

Interface control process

interface-control

Controls the router's or switch’s physical interface devices and logical interfaces.

Kernel replication process

kernel-replication

Replicates the state of the backup Routing Engine when graceful Routing Engine switchover (GRES) is configured.

Layer 2 address flooding and learning process

l2-learning

Enables a router to:

  • Learn unicast media access control (MAC) addresses to avoid flooding the packets to all the ports in a bridge domain.

  • Create a source MAC entry in its source and destination MAC tables for each MAC address learned from packets received on ports that belong to the bridge domain.

Layer 2 Control Protocol process

l2cpd-service

Enables features such as Layer 2 protocol tunneling and nonstop bridging.

Link Aggregation Control Protocol process

lacp

The process:

  • Provides a standardized means for exchanging information between partner systems on a link.

  • Allows the link aggregation control instances to reach agreement on the identity of the Link Aggregation Group (LAG) to which the link belongs, and then to move the link to that LAG.

  • Enables the transmission and reception processes for the link to function in an orderly manner.

Link management process

link-management

Manages traffic engineering links.

Local policy decision function process

local-policy-decision-function

Regulates the collection of statistics related to applications and application groups and tracking of information about dynamic subscribers and static interfaces.

Logical system multiplexer process

logical-system-mux

or

lrmuxd

Manages multiple instances of the routing protocols process (rpd) on a machine running logical routers.

MAC validation process

mac-validation

Configures MAC address validation that enables a router to validate if received packets contain a trusted IP source and an Ethernet MAC source address.

Management Information Base II process

mib-process

Provides the router's MIB II agent.

Mobile IP process

mobile-ip

Configures Junos OS Mobile IP features.

NFS mount requests process

mountd-service

(Some EX Series switches and MX Series routers only) Completes internal NFS mount requests for MS-PIC and MS-MPC.

MPLS Periodic Traceroute process

mpls-traceroute

Enables tracing of forwarding equivalence classes (FECs) for LDP Layered Service Providers (LSPs).

Multiservice process

mspd

Configures multiservice edge routers.

Multicast Snooping process

multicast-snooping

(EX Series switches and MX Series routers only) Makes Layer 3 information, such as the MAC addresses of members of a multicast group, known to Layer 2 devices, such as VLAN switches.

DNS server process

named-service

Enables a router or a switch to resolve hostnames into addresses.

Bidirectional Forwarding Detection (BFD) process

neighbor-liveness

Displays the process that specifies the maximum length of time that the router waits for its neighbor to re-establish an LDP session.

Remote NFS server process

nfsd-service

Provides remote file access for applications that need NFS-based transport.

Network time process

ntp

Provides the mechanisms to synchronize time and coordinate time distribution in a large, diverse network.

Packet-triggered dynamic subscribers and policy control (PTCP) process

packet-triggered-subscribers

Enables the application of policies to dynamic subscribers that are controlled by a subscriber termination device.

Peer selection service process

peer-selection-service

Enables peer selection.

Periodic packet management process

periodic-packet-services

Processes a variety of time-sensitive periodic tasks so that other processes can more optimally direct their resources.

Packet Forwarding Engine process

pfed

Gathers and reports Packet Forwarding Engine statistics.

Packet gateway service process

pgcp-service

or

pgcpd

Configures the Packet Gateway Control Protocol (PGCP) that is required for the border gateway function (BGF) feature.

Pragmatic General Multicast process

pgm

Enables a reliable transport layer for multicast applications.

PIC services logging process

pic-services-logging

or

fsad (the file system access daemon)

Enables PICs to send special logging information to the Routing Engine for archiving on the hard disk.

Point-to-Point Protocol (PPP) process

ppp

Enables transporting IP traffic across point-to-point links.

Universal edge PPP process

ppp-service

Enables transporting IP traffic across universal edge routers.

Point-to-Point Protocol over Ethernet process

pppoe

Allows users to connect to a network of hosts over a bridge or access concentrator.

Process health monitor process

process-monitor

or

pmond

Extends the SNMP RMON alarm infrastructure to provide predefined monitoring for a selected set of object instances (such as file system usage, CPU usage, and memory usage) and dynamic object instances (such as Junos OS processes).

Note: The process health monitor process is enabled by default on the Routing Engines of MX Series routers, even when no service interfaces are configured. To disable this process, include the disable statement at the [edit system processes process-monitor] hierarchy level.

Redundancy interface management process

redundancy-interface-process

Serves as an active or backup process of an application server and can be configured to process traffic for more than one logical application server.

Remote operations process

remote-operations

Provides the ping and traceroute MIBs.

Resource cleanup process

resource-cleanup

Enables cleaning of resources by entities other than the application itself.

Routing process

routing

Directs forwarding on the basis of routing tables, which maintain a record of the routes to various network destinations.

Traffic sampling control process

sampling

Performs packet sampling based on particular input interfaces and various fields in the packet header.

Session Border Control (SBC) configuration process

sbc-configuration-process

Configures the session border controller functionality that enables delivery of voice, video, and other multimedia services with assured quality and security.

SDK service process

sdk-service

Runs on the Routing Engine and enables communication between the SDK application and Junos OS. Although the SDK service process is present on the router, it is turned off by default.

Secure Neighbor Discovery (SND) protocol process

secure-neighbor-discovery

or

send

(EX Series switches and MX Series routers only) Provides support for protecting NDP messages.

Service Deployment System (SDX) process

service-deployment

Enables Junos OS to work with the Session and Resource Control (SRC) software.

Simple Network Management Protocol (SNMP) process

snmp

Enables the monitoring of network devices from a central location, and provides the router's or switch’s SNMP master agent.

SONET Automatic Protection Switching (APS) process

sonet-aps

Monitors any SONET interface that participates in APS.

Static subscribers process

static-subscribers

Associates subscribers with statically configured interfaces, and provides dynamic service activation and activation for these subscribers.

Tunnel OAM process

tunnel-oamd

Enables the Operations, Administration, and Maintenance of Layer 2 tunneled networks.

Virtual Router Redundancy Protocol (VRRP) process

vrrp

(EX Series switches and MX Series routers only) Enables hosts on a LAN to make use of redundant routing platforms on that LAN without requiring more than the static configuration of a single default route on the hosts.

Watchdog timer process

watchdog

Enables the watchdog timer when Junos OS encounters a problem.