Juniper J series is a line of enterprise routers designed and manufactured by

Juniper Networks Juniper Networks, Inc. is an American multinational corporation headquartered in Sunnyvale, California. The company develops and markets networking products, including Router (computing), routers, Network switch, switches, network management so ...

. They are modular routers for enterprises running

desktop A desktop traditionally refers to: * The surface of a desk (often to distinguish office appliances that fit on a desk, such as photocopiers and printers, from larger equipment covering its own area on the floor) Desktop may refer to various compu ...

s, servers,

VoIP Voice over Internet Protocol (VoIP), also known as IP telephony, is a set of technologies used primarily for voice communication sessions over Internet Protocol (IP) networks, such as the Internet. VoIP enables voice calls to be transmitted as ...

, CRM / ERP / SCM applications. The J Series routers are typically deployed at remote offices or branch locations. These Services routers include the J2320 and J2350 for smaller offices, the J4350 for medium-size branches, and the J6350 for large branches or regional offices.

Platform development history

Juniper began working on J series in the middle of the telecom downturn (2002), while looking for ways to extend its product portfolio. The main idea behind the new product line was to create the cost-optimized routing system that could utilize increasingly powerful general-purpose CPUs and operate under fully-fledged, multi-threaded OS. This was a major departure from "traditional" branch router design, which dictated the use of low-end RISC CPUs working under simplified operating system with marginal multitasking and memory protection capabilities. The first iteration of J-series design was based on high-end Intel CPUs and featured Intel IXP-based interface cards running over PCI bus. Later models added

PCI Express PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe, is a high-speed standard used to connect hardware components inside computers. It is designed to replace older expansion bus standards such as Peripher ...

connectivity as well as specialized

Cavium Cavium, Inc. was a fabless semiconductor company based in San Jose, California, specializing in ARM-based and MIPS-based network, video and security processors and SoCs. The company was co-founded in 2000 by Syed B. Ali and M. Raghib Hussain, ...

security processors. From the software perspective, the J series runs JUNOS with a real-time extensions for the forwarding plane function. This unique architecture allows J-series routers to avoid the "resource starvation" problem commonly seen on legacy software forwarding platforms.

Models and platforms

The J series of routers includes the models such as J2320, J2350, J4350 and J6350. The initial models were J2300, J4300 and J6300 routers.

J2320

The J2320 routers are entry level service routers which gives up to 600 Mbit/s throughput performance, has four built-in Gigabit Ethernet ports. It has three PIM slots for additional LAN/WAN connectivity, Avaya VoIP Gateway, and WAN acceleration. They are used for one or two broadband, T1, or E1 interfaces with integrated services.

J2350

The J2350 router which has four built-in Gigabit Ethernet ports, gives up to 700 Mbit/s performance. It gives five PIM slots. They are usually used for multiple broadband, T1, or E1 interfaces with multiple integrated services.

J4350

The J4350 enterprise router gives up to 1 Gbit/s in performance. They are usually used for DS3, E3, and Metro Ethernet interfaces with integrated services. It has six PIM slots. Two of these slots are enhanced-performance slots that provide additional performance to multiple Gigabit Ethernet configurations.

J6350

The J6350 gives up to 2 Gbit/s in performance. It has six PIM slots for additional LAN/WAN connectivity, Avaya VoIP Gateway, and WAN acceleration. These routers have optional redundant power supplies for high system availability.

Features

The J-series routers run on Juniper's

network operating system A network operating system (NOS) is a specialized operating system for a network device such as a router, switch or firewall. Historically operating systems with networking capabilities were described as network operating systems, because they ...

JUNOS Junos OS (also known as Juniper Junos, Junos and JUNOS) is a FreeBSD-based, and later also Linux-based, network operating system used in Juniper Networks routing, switching and security devices. Versions Junos OS was first made available on 7 ...

. These routers have 4 on-board GigE ports and expandable

WAN WAN or Wan may refer to: Language * Wan language of the Ivory Coast * 万/萬 (Pinyin: Wàn), 10,000 in Chinese People * Wan (surname) ( and ), a Chinese surname * Wan (surname 溫), an alternative spelling for the Chinese surname Wen (溫) * ...

and

LAN Lan or LAN may refer to: Science and technology * Local asymptotic normality, a fundamental property of regular models in statistics * Longitude of the ascending node, one of the orbital elements used to specify the orbit of an object in space * ...

interfaces via pluggable modules. They have a wide range of interfaces supporting Serial, T1/E1, FE, DS3/E3, ISDN, ADSL2/2+, G.SHDSL and Gigabit Ethernet and a wide array of

Layer 2 The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. The data link layer pr ...

access protocols including

Frame Relay Frame Relay (FR) is a standardized wide area network (WAN) technology that specifies the Physical layer, physical and data link layers of digital telecommunications channels using a packet switching methodology. Frame Relay was originally devel ...

Ethernet Ethernet ( ) is a family of wired computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 198 ...

and

Point-to-Point Protocol In computer networking, Point-to-Point Protocol (PPP) is a data link layer (layer 2) communication protocol between two routers directly without any host or any other networking in between. It can provide loop detection, authentication, transmissio ...

(PPP)/

HDLC High-Level Data Link Control (HDLC) is a communication protocol used for transmitting data between devices in Telecommunications, telecommunication and Computer network, networking. Developed by the International Organization for Standardization ...

. Other features includes

Network Address Translation Network address translation (NAT) is a method of mapping an IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic Router (computing), routing device. The te ...

(NAT), and J-Flow accounting and advanced services such as

IPv6 Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communication protocol, communications protocol that provides an identification and location system for computers on networks and routes traffic ...

MPLS Multiprotocol Label Switching (MPLS) is a routing technique in telecommunications networks that directs data from one node to the next based on labels rather than network addresses. Whereas network addresses identify endpoints, the labels identi ...

Stateful firewall In computing, a stateful firewall is a network-based firewall that individually tracks sessions of network connections traversing it. Stateful packet inspection, also referred to as dynamic packet filtering, is a security feature often used in n ...

quality of service Quality of service (QoS) is the description or measurement of the overall performance of a service, such as a telephony or computer network, or a cloud computing service, particularly the performance seen by the users of the network. To quantitat ...

multicast In computer networking, multicast is a type of group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast differs from ph ...

VPN Virtual private network (VPN) is a network architecture for virtually extending a private network (i.e. any computer network which is not the public Internet) across one or multiple other networks which are either untrusted (as they are not c ...

, security services and IPSec. Juniper partnered with

Avaya Avaya LLC(), formerly Avaya Inc., is an American multinational technology company headquartered in Morristown, New Jersey, that provides cloud communications and workstream collaboration services. The company's platform includes unified commun ...

to deliver packet voice functionality. J-series routers directly benefit from modular and fault-protected software design of the

operating system. Unlike traditional enterprise routers, each software module in the JUNOS operating system runs independently and therefore cannot impact other processes. The unique, generalized JUNOS architecture provides complete separation of the

routing Routing is the process of selecting a path for traffic in a Network theory, network or between or across multiple networks. Broadly, routing is performed in many types of networks, including circuit-switched networks, such as the public switched ...

and

packet forwarding Packet forwarding is the relaying of packets from one network segment to another by nodes in a computer network. Models The simplest forwarding model unicastinginvolves a packet being relayed from link to link along a chain leading from th ...

engines in platforms with both hardware and software forwarding planes. Even under DDoS attack, J-series routers retain complete control over system operation, allowing console-connected operator to add new filters and policies in order to mitigate the threat. Parts of J-series technology were later reused in SRX series products.

References

External links

* http://www.juniper.net/us/en/products-services/routing/j-series/ {{Juniper Networks Juniper Networks Routers (computing)