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Juniper Networks EX4300-48T
A single platform offering the flexibility required for today's enterprise

Juniper Networks EX4300-48T

Juniper Networks Products
EX4300 Switches
UK: FREE DeliveryEX4300, 48-port 10/100/1000BaseT
*Includes 1 PSU JPSU-350-AC-AFO; 40GE QSFP+ to be ordered seperately for virtual chassis connections; optics sold seperately
Our Price: £5,611.40
Inc. VAT: £6,733.68

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The Juniper Networks EX4300 line of Ethernet switches delivers the performance and scale required for both campus and data center Gigabit Ethernet (GbE) access switch deployments. Combined with Juniper's market leading Virtual Chassis technology, the EX4300 scales up to 10 members, delivering the high availability and plug-and-play scale that businesses demand. Combining compact, pay-as-you-grow economics and low power and cooling with the performance, availability, and port densities of chassis-based platforms, the EX4300 with Virtual Chassis technology enables businesses to deploy with speed and agility to increase revenue and improve productivity.

The Juniper Networks EX4300 line of Ethernet switches with Virtual Chassis technology combines the carrier-class reliability of modular systems with the economics and flexibility of stackable platforms, delivering a high-performance, scalable solution for data center, campus and branch office environments.

Offering a full suite of Layer 2 and Layer 3 switching capabilities, the EX4300 enables a variety of deployments, including campus, branch and data center access. A single 24port or 48-port EX4300 switch can be deployed initially. As requirements grow, Juniper Networks Virtual Chassis technology allows up to 10 EX4300 switches to be seamlessly interconnected and managed as a single device, delivering a scalable, pay-as-you-grow solution for expanding network environments. The EX4300 integrates with QFX3500, QFX3600 and QFX5100 10GbE and 40GbE data center access switches in a single stack or a Virtual Chassis configuration, enabling non-disruptive 10GbE server upgrades and simplified management of a mixed access environment.

The EX4300 switches can be interconnected over multiple 40GbE quad small formfactor pluggable plus (QSFP+) transceiver ports to form a 320 gigabit per second (Gbps) backplane. A flexible uplink module that supports both 1GbE and 10GbE options is also available, enabling high-speed connectivity to aggregation- or core-layer switches which connect multiple floors or buildings. All EX4300 switches include high availability (HA) features such as redundant, hot- swappable internal power supplies and field-replaceable fans to ensure maximum uptime. In addition, Power over Ethernet (PoE)-enabled EX4300 switch models offer standardsbased 802.3at PoE+ for delivering up to 30 watts on all ports for supporting high-density IP telephony and 802.11n wireless access point deployments.

Chassis-Like Features in an Expandable Form Factor

The fixed-configuration EX4300 switches include a number of high availability features typically associated with chassis-based solutions, including the following:

  • Hot-swappable fans
  • Modular Juniper Networks Junos operating system (consistent with chassis systems)
  • Dual Routing Engines with graceful Routing Engine switchover (GRES)
  • Single management interface
  • Easy, centralized software upgrades
  • Scalability from 24 to 480 10/100/1000BASE-T ports, with up to 40 10GbE uplinks and 40 40GbE uplinks
  • Limited lifetime hardware warranty

Each EX4300 switch includes a single application-specific integrated circuit (ASIC)-based Packet Forwarding Engine, the EX-PFE. The integrated Routing Engine (RE) delivers all control plane functionality. The EX4300 also leverages the same modular Junos OS as other Juniper Networks switches, routers, and securitydevices, ensuring a consistent implementation and operation of control plane features across the Juniper Networks infrastructure.

Architecture and Key Components:

The EX4300 switches are single rack unit devices that deliver a compact solution for crowded wiring closets and access switch locations where space and power are at a premium. Each EX4300 supports four standard 40GbE QSFP+ ports which can support high-speed Virtual Chassis backplane connections or serve as uplinks to upstream aggregation devices. In addition, each EX4300 supports an optional front panel uplink module offering four 1GbE or 10GbE ports for high-speed backbone or link aggregation connections between wiring closets and upstream aggregation switches, providing up to 40 Gigabits of aggregate bandwidth. Uplink modules can be installed without powering down the switch, enabling users to add high-speed connectivity at any time or migrate from one uplink type to the other, delivering the ultimate in flexible, high-performance interconnectivity.

The EX4300 also features a front panel LCD that offers a flexible interface for performing device bring-up and configuration rollbacks, reporting switch alarm and LED status, or restoring the switch to its default settings. when deployed as a member of a Virtual Chassis configuration, the LCD also displays the switch's chassis "slot number" and RE status for rapid identification and problem resolution.

The four integrated rear panel 40GbE QSFP+ ports support EX4300 Virtual Chassis deployment over a 320 Gbps virtual backplane. when deployed in close proximity such as in wiring closets or in top-of-rack data center applications, the EX4300 switches can be securely connected using standard 40GbE QSFP+ DAC cables (available in 50 cm, 1 m, and 3 m lengths). Switches deployed in Virtual Chassis configurations spread over larger areas can be interconnected using optical QSFP+ transceivers such as the QSFP+ SR4, which supports distances up to 150 m.

A dedicated rear panel RJ-45 port is available for out-of-band management, while a rear panel USB port can be used to easily upload Junos OS and configuration files. In addition, a dedicated front panel USB console port and a rear panel RJ-45 console port offer flexible out-of-band console options.

Virtual Chassis Technology

Up to 10 EX4300 switches can be interconnected using Virtual Chassis technology, creating a single logical device supporting up to 480 10/100/1000BASE-T ports, plus up to 40 additional 10GbE and 40 additional 40GbE uplink ports. For mixed 1GbE and 10GbE access environments, the EX4300 can be interconnected with the QFX3500, QFX3600 and QFX5100 high-performance data center access switches. EX4300 Virtual Chassis configurations can be created to support a variety of port and density options for data center, campus and branch deployments. Virtual Chassis connections can be formed using any of the 40GbE ports or 10GbE ports using standard DAC cables and optics. The EX4300 does not support Virtual Chassis technology on the GbE copper or fiber ports.

Virtual Chassis Deployments in Campus Wiring Closets

In campus wiring closets, flexible topologies can be created using standard QSFP+ optics on the 40GbE ports to extend the Virtual Chassis configuration across long distances spanning multiple wiring closets, floors, or even buildings while using 10GbE or 40GbE for uplink connectivity.

Virtual Chassis Deployments in the Data Center

when deployed in a Virtual Chassis configuration in the data center, all EX4300 switches are monitored and managed as a single device, enabling enterprises to separate physical topology from logical groupings of endpoints and allowing more efficient resource utilization. Highly resilient topologies can also be created using the 40GbE DAC cables.

Using Virtual Chassis technology, up to 10 EX4300 switches can be interconnected to create a single logical device spanning an entire building. Using Virtual Chassis technology, up to 10 EX4300 switches can be interconnected to create a single logical device spanning an entire building.

Mesh Virtual Chassis Configurations for the Data Center

In data center top-of-rack deployments, a full mesh five-switch Virtual Chassis configuration can be created where every switch member is just one hop away from every other member, delivering the lowest possible latency. A mesh spanning distances of up to 150 meters can be created using standard QSFP+ optics on the 40GbE ports (DAC cables up to 3m in length available for shorter distances), while 10GbE ports can be used as uplinks to connect to upstream aggregation or core devices.

The EX4300 Ethernet switch with Virtual Chassis technology delivers a high-performance, scalable, and highly reliable solution for the data center.EX4300 switches in a full mesh Virtual Chassis configuration for the data center.

Virtual Chassis Fabric Switching Architecture

Existing Virtual Chassis technology is further scaled and enhanced to support a spine-and-leaf topology that is ideal for highperformance and low-latency data center deployments. In its first instance, this topology, called Virtual Chassis Fabric, enables up to 20 switches to be deployed in a spine-and-leaf configuration, with two to four QFX5100 switches in the spine and up to 18 QFX5100, QFX3500, QFX3600 or EX4300 switches as leaf nodes. This architecture provides any rack-to-any rack deterministic throughput and low latency, while significantly simplifying network operations through a single point of management. A Virtual Chassis Fabric configuration supports mixed 1GbE, 10GbE and 40GbE servers.

EX4300, QFX3500, QFX3600 and QFX5100 at the access layer of Virtual Chassis Fabric configuration.

Features and Benefits:

Chassis-Class Availability

The EX4300 line of Ethernet switches delivers high availability through redundant power supplies and fans, GRES, and nonstop bridging and routing when deployed in a Virtual Chassis configuration.

In a Virtual Chassis configuration, each EX4300 switch is capable of functioning as a Routing Engine. when two or more EX4300 switches are interconnected, a single control plane is shared among all Virtual Chassis member switches. when two EX4300 switches are interconnected, Junos OS automatically initiates an election process to assign a master (active) and backup (hot-standby) Routing Engine. An integrated Layer 2 and Layer 3 GRES feature maintains uninterrupted access to applications, services, and IP communications in the unlikely event of a primary RE failure.

When more than two switches are interconnected in a Virtual Chassis configuration, the remaining switch elements act as line cards and are available to assume the backup RE position should the designated master fail. Master, backup, and line card priority status can be assigned to dictate the order of ascension; this N+1 RE redundancy, coupled with the GRES, nonstop routing (NSR) and nonstop bridging (NSB) capabilities of the Junos OS, assures a smooth transfer of control plane functions following unexpected failures.

The EX4300 implements the same slot/module/port numbering schema as other Juniper Networks chassis-based products when numbering Virtual Chassis ports, providing true chassis-like operations. By utilizing a consistent operating system and a single configuration file, all switches in a Virtual Chassis configuration are treated as a single device, simplifying overall system maintenance and management.

Individually, the EX4300 offers a number of HA features that are typically associated with modular chassis-based switches. when combined with the field-proven Junos OS and L2/L3 failover capabilities, these features provide the EX4300 with true carrierclass reliability.

  • Redundant power supplies: The EX4300 line of Ethernet switches supports internal redundant, load-sharing, hot-swappable, and field-replaceable AC and DC power supplies to maintain uninterrupted operations. Thanks to its compact footprint, the EX4300 requires significantly less power than chassis-based switches delivering equivalent port densities.
  • Hot-swappable fans: The EX4300 includes hot-swappable fans, providing sufficient cooling even if one of the fans were to fail.
  • Non-Stop Bridging (NSB) and Non-Stop Routing (NSR): NSB and NSR on the EX4300 ensure control plane protocols, states and tables are synchronized between Master and Standby REs to prevent protocol flaps or convergence issues following a Routing Engine failover.
  • Redundant trunk group (RTG): To avoid the complexities of Spanning Tree Protocol (STP) without sacrificing network resiliency, the EX4300 employs redundant trunk groups to provide the necessary port redundancy and simplify switch configuration.
  • Cross-member link aggregation: Cross-member link aggregation allows redundant link aggregation connections between devices in a single Virtual Chassis configuration, providing an additional level of reliability and availability.
  • Carrier-class hardware: The EX4300 leverages a purpose-built packet forwarding engine ASIC, the EX-PFE, which integrates 4 much of the same intellectual property used in Juniper Networks carrier-class routers. As a result, the EX4300 delivers the same predictable, scalable functionality found in the world's largest networks.
  • IPv4 and IPv6 routing support: IPv4 and IPv6 Layer 3 routing (OSPF and BGP) is available with an Enhanced license, enabling highly resilient networks.

Carrier-Class Operating System

The EX4300 runs on Junos OS, the same operating system software used by other Juniper Networks switches, routers, and security devices.

By utilizing a common operating system, Juniper delivers a consistent implementation and operation of control plane features across all products. To maintain that consistency, Junos OS adheres to a highly disciplined development process that utilizes a single source code, follows a single quarterly release train, and employs a highly available modular architecture that prevents isolated failures from bringing an entire system down.

These attributes are fundamental to the core value of the software, enabling all products powered by Junos OS to be updated simultaneously with the same software release. All features are fully regression tested, making each new release a true superset of the previous version. Customers can deploy the software with complete confidence that all existing capabilities will be maintained and operate in the same way.

Converged Networks

The EX4300 line of Ethernet switches provides the highest levels of availability for the most demanding converged data, voice, and video environments, delivering the most reliable platform for unifying enterprise communications.

The EX4300 supports rich quality of service (QoS) functionality for prioritizing data, voice, and video traffic. The switches support 12 QoS queues on every port, enabling them to maintain multilevel, end-to-end traffic prioritizations. The EX4300 also supports a wide range of policy options, including priority and weighted deficit round-robin (wDRR) queuing.

By providing 15.4 watts of Class 3 802.3af PoE on all ports to power voice over IP (VoIP) telephones, closed-circuit security cameras, wireless access points, and other IP-enabled devices, the EX4300 delivers a future-proofed solution for converging disparate networks onto a single IP infrastructure. The EX4300 switches also support standards-based 802.3at PoE+, which delivers up to 30 watts per port for powering networked devices like multiple radio IEEE 802.11n wireless access points and video phones that may require more power than available with IEEE 802.3af.

Link Layer Discovery Protocol-Media Endpoint Discovery (LLDPMED)-based granular PoE/PoE+ management allows the EX4300 to negotiate PoE/PoE+ usage down to a fraction of a watt on powered devices, enabling more efficient PoE utilization across the switch.

To ease deployment, the EX4300 supports the industry-standard LLDP and LLDP-MED, which enable the switches to automatically discover Ethernet-enabled devices, determine their power requirements, and assign virtual LAN (VLAN) parameters.

The EX4300 is hardware-ready (with future software support) to support the IEEE 802.3az standard for Energy Efficient Ethernet (EEE) functionality, reducing power consumption of copper physical layers (PHY) during periods of low link utilization.


The EX4300 line of Ethernet switches fully integrates with Juniper Networks Unified Access Control (UAC), which consolidates all aspects of a user's identity, device, and location, enabling administrators to enforce access control and security down to the individual port or user levels.

The UAC solution is composed of three main components: Juniper Networks Junos Pulse as the endpoint client (also available in an agent-less mode); the Junos Pulse Access Control Service running on a blade in a MAG Series Junos Pulse Gateway chassis or on a dedicated MAG Series appliance; and UAC enforcement points. working as an enforcement point with the UAC solution, the EX4300 provides both standards-based 802.1X port-level access control as well as L2-L4 policy enforcement based on user identity, location, and/or device. A user's identity, device type, machine posture check, and location can be used to determine whether access should be granted and for how long. If access is granted, the switch assigns the user to a specific VLAN based on authorization levels. The switch can also apply QoS policies or mirror user traffic to a central location for logging, monitoring, or threat detection by intrusion prevention systems.

Additionally, a captive portal redirection feature redirects URLs from the EX4300 to the MAG Series gateway running Pulse Access Control Service for user authentication and authorization, making the UAC solution a "single source of truth" for user and device authentication and for enforcing role-based security policies.

The EX4300 also provides a full complement of port security features, including Dynamic Host Configuration Protocol (DHCP) snooping, dynamic ARP inspection (DAI), IP Source Guard, and media access control (MAC) limiting (per port and per VLAN) to defend against internal and external spoofing, man-in-the-middle and denial-of-service (DoS) attacks.


EX4300 switches support IEEE 802.1ae MACsec, providing support for link-layer data confidentiality, data integrity, and data origin authentication. The MACsec feature enables the EX4300 to support 88 Gbps of near line-rate hardware-based traffic encryption on all GbE and 10GbE ports, including the base unit and optional uplink modules.

Defined by IEEE 802.1AE, MACsec provides secure, encrypted communication at the link layer that is capable of identifying and preventing threats from denial of service (DoS) and intrusion attacks, as well as man-in-the-middle, masquerading, passive wiretapping and playback attacks launched from behind the firewall. when MACsec is deployed on switch ports, all traffic is encrypted on the wire but traffic inside the switch is not. This allows the switch to apply all network policies such as QoS, deep packet inspection and sFlow to each packet without compromising the security of packets on the wire.

Hop-by-hop encryption enables MACsec to secure communications while maintaining network intelligence. In addition, Ethernet-based wAN networks can use MACsec to provide link security over longhaul connections. MACsec is transparent to Layer 3 and higher-layer protocols and is not limited to IP traffic; it works with any type of wired or wireless traffic carried over Ethernet links.

Simplified Management and Operations

When employing Virtual Chassis technology, the EX4300 dramatically simplifies network management. Up to 10 interconnected EX4300 switches can be managed as a single device. Each Virtual Chassis group utilizes a single Junos OS image file and a single configuration file, reducing the overall number of units to monitor and manage. when Junos OS is upgraded on the master switch in a Virtual Chassis configuration, the software is automatically upgraded on all other member switches at the same time.

MACsec deployment with EX4300 and EX4550 switches.

The EX4300 also includes port profiles that allow network administrators to automatically configure ports with security, QoS, and other parameters based on the type of device connected to the port. Six preconfigured profiles are available, including default, desktop, desktop plus IP phone, wireless access point, routed uplink, and Layer 2 uplink. Users can select from the existing profiles or create their own and apply them through the command line interface (CLI), Junos web interface, or management system.

The EX4300 switches can be managed through Junos Space Network Director*, a next-generation network management solution that allows users to visualize, analyze and control the entire enterprise network-data center and campus, physical and virtual, and wired and wireless-through a single pane of glass. It incorporates sophisticated analytics for real-time intelligence, trended monitoring, and automation to increase agility as well as faster rollout and activation of services.

For cloud deployments, Network Director provides a set of REST APIs that enable on-demand and dynamic network services by simplifying the consumption of services for multi- tenant environments. with third-party cloud orchestration tool integration, the Network Director API enables automation and provisioning of Layer 2, Layer 3 and security services in the data center without the need for manual operator intervention.

Finally, the EX4300 switch system, performance, and fault data can be exported to leading third-party management systems such as HP OpenView, IBM Tivoli, and Computer Associates Unicenter software to provide a complete, consolidated view of network operations.

Limited Lifetime Warranty

The EX4300 includes a limited lifetime hardware warranty that provides return-to-factory switch replacement for as long as the original purchaser owns the product. The warranty includes lifetime software updates, advanced shipping of spares within one business day, and 24x7 Juniper Networks Technical Assistance Center (JTAC) support for 90 days after the purchase date. Power supplies and fan are covered for a period of five years.

Product Options:

EX4300 Line of Ethernet Switches
Model: Access Port Configuration PoE/PoE+ Ports PoE Budget Power Supply Rating Airflow
EX4300-24T 24-port 10/100/1000BASE-T 0 0 W 350 W AC AFO (Front-to-back airflow )
EX4300-24P 24-port 10/100/1000BASE-T 24 500 W 715 W AC AFO (Front-to-back airflow )
EX4300-48T 48-port 10/100/1000BASE-T 0 0 W 350 W AC AFO (Front-to-back airflow )
EX4300-48P 48-port 10/100/1000BASE-T 48 900 W 1100 W AC AFO (Front-to-back airflow )
EX4300-48T-AFI 48-port 10/100/1000BASE-T 0 0 W 350 W AC AFI (Back-to-front airflow)
EX4300-48T-DC 48-port 10/100/1000BASE-T 0 0 W 550 W DC AFO (Front-to-back airflow )
EX4300-48T-DC-AFI 48-port 10/100/1000BASE-T 0 0 W 550 W DC AFI (Back-to-front airflow)

Model Power Supply Rating Acoustic Noise
EX4300-24T 350 W AC AFO 38.5
EX4300-24P 350 W AC AFO 37.8
EX4300-48T 350 W AC AFI 38.9
EX4300-48P 715 W AC AFO 39.7
EX4300-48T-AFI 1100 W AC AFO 51.0
EX4300-48T-DC 350 W AC AFO 39.7
EX4300-48T-DC-AFI 350 W AC AFO 39.7


Model: EX4300-24P
Physical Specifications
Backplane 320 Gbps Virtual Chassis interconnect to combine up to 10 units as a single logical device
Uplink Module Options 4-port dual-mode 10GbE/1GbE module with pluggable SFP+/SFP optics
Dimensions (W x H x D)
  • 17.41 x 1.72 x 16.43 in (44.21 x 4.32 x 41.73 cm)
  • Desktop installation width noted above, rack-mount width is 17.5 in (44.5 cm)
  • Height: 1 rack unit (1 U)
  • EX4300 switch (no power supply or fan module): 13 lb (5.9 kg)
  • EX4300 switch (with single power supply and two fan modules): 16.1 lb (7.3 kg)
  • 350 W AC power supply: 2.4 lb (1.1 kg)
  • SFP+ uplink module: 0.44 lb (0.2 kg)
  • Fan module: 0.33 lb (0.15 kg)
Rack mountable 1 Rack Unit
Hardware Specifications
Switching Engine Model Store and forward
DRAM 2 GB with Error Correcting Code (ECC)
Flash 2 GB
CPU 1.5 GHz Dual-Core PowerPC CPU
GbE port density per system 56 (48 host ports + four 40GbE ports + optional fourport 1/10GbE uplink module)
10GbE port density per system 4 (uplink module)
40GbE port density per system 4
Packet Switching Capacities 496 Gbps
Layer 2 Throughput (Mpps) 369 Mpps (wire speed)
Supported Optics
  • GbE SFP optic/connector type: LC SFP fiber supporting SX (multimode), LX (single-mode)
  • 10GbE SFP+ optic/connector type: 10GbE SFP+ LC connector, SR (multimode), USR (multimode), LR (single-mode), ER (singlemode), LRM (multimode), and DAC (direct-attach copper)
  • 40 GbE QSFP+ optic/connector type: 40GbE QSFP+ LC connector type, SR (multimode), DAC (direct-attach copper)
Physical Layer
  • Time Domain Reflectometry (TDR) for detecting cable breaks and shorts: 24P/24T and 48P/48T only
  • Auto medium-dependent interface/medium-dependent interface crossover (MDI/MDIX) support: 24P/24T and 48P/48T only (all ports)
  • Port speed downshift/setting maximum advertised speed on 10/100/1000BASE-T ports: 24P/24T and 48P/48T only, on all ports
  • Digital optical monitoring for optical ports
Power Options
Power Supply Rating 350 W AC dual load-sharing hot-swappable internal redundant power supplies
PoE Budget 0 W
Maximum Current Inrush 50 amps
Minimum number of PSUs required for fully loaded chassis 1 per switch
Operating Temperature 32° to 113° F (0º to 45º C)
Storage Temperature -40º to 158º F (-40º to 70º C)
Relative Humidity (Operating) 10% to 85% (noncondensing)
Relative Humidity (Non-Operating) 0% to 95% (noncondensing)
Altitude (Operating) Up to 10,000 ft (3,048 m)
Altitude (Non-Operating) Up to 16,000 ft (4,877 m)
Cooling Airflow AFO (Front-to-back airflow)
Noise Specifications
Noise Specifications Noise measurements based on operational tests taken from bystander position (front) and performed at 23° C in compliance with ISO 7779
Acoustic Noise in DBA 37.8
Safety and Compliance
Safety Certifications
  • UL-UL60950-1 (First Edition)
  • C-UL to CAN/CSA 22.2 No. 60950-1 (First Edition)
  • TUV/GS to EN 60950-1, Amendment A1-A4, A11
  • EN 60950-1 (2006 +A1:2009+A12:2010) Information Technology Equipment-Safety
  • IEC 60950-1 (2005 +A1:2009) Information Technology Equipment-Safety
Electromagnetic Compatibility Certifications
  • FCC 47CFR Part 15 Class A
  • EN 55022 Class A
  • ICES-003 Class A
  • VCCI Class A
  • AS/NZS CISPR 22 Class A
  • CISPR 22 Class A
  • EN 55024
  • EN 300386
  • CE
NEBS GR-1089-Core: EMC and Electrical Safety for Network Telecommunications Equipment
Environmental Reduction of Hazardous Substances (ROHS) 6/6
Telco CLEI code
Warranty Limited lifetime switch hardware warranty

Additional Feature Specifications:

  • MAC limiting (per port and per VLAN)
  • Allowed MAC addresses configurable per port
  • Dynamic ARP inspection (DAI)
  • IP source guard
  • Local proxy ARP
  • Static ARP support
  • DHCP snooping
  • Captive portal
  • Persistent MAC address configurations
  • Distributed denial of service (DDoS) protection (CPU control path flooding protection)

Layer 2/Layer 3 Throughput (Mpps) (Maximum with 64 Byte Packets)

  • 24P/24T: 333 Mpps (wire speed)
  • 48P/48T: 369 Mpps (wire speed)

Layer 2 Switching

  • Maximum MAC addresses per system: 64,000
  • Jumbo frames: 9,216 Bytes
  • Number of VLANs: 4,093
  • Virtual Spanning Tree (VST) instances: 510
  • Port-based VLAN
  • Voice VLAN
  • Physical port redundancy: Redundant trunk group (RTG)
  • Compatible with Per-VLAN Spanning Tree Plus (PVST+)
  • Routed VLAN Interface (RVI)
  • Uplink Failure Detection (UFD)
  • ITU-T G.8032 Ethernet Ring Protection Switching
  • IEEE 802.1AB: Link Layer Discovery Protocol (LLDP)
  • LLDP-MED with VoIP integration
  • IEEE 802.1p: CoS prioritization
  • IEEE 802.1Q: VLAN tagging
  • IEEE 802.1X: Port Access Control
  • IEEE 802.1ak: Multiple Registration Protocol
  • IEEE 802.3: 10BASE-T
  • IEEE 802.3u: 100BASE-T
  • IEEE 802.3ab: 1000BASE-T
  • IEEE 802.3z: 1000BASE-X
  • IEEE 802.3ae: 10-Gigabit Ethernet
  • IEEE 802.3ba: 40-Gigabit Ethernet
  • IEEE 802.3af: Power over Ethernet
  • IEEE 802.3at: Power over Ethernet Plus
  • IEEE 802.3x: Pause Frames/Flow Control
  • IEEE 802.3ah: Ethernet in the First Mile

Spanning Tree

  • IEEE 802.1D: Spanning Tree Protocol
  • IEEE 802.1s: Multiple instances of Spanning Tree Protocol (MSTP)
  • Number of MST instances supported: 64
  • Number of VLAN Spanning Tree Protocol (VSTP) instances supported: 510
  • IEEE 802.1w: Rapid reconfiguration of Spanning Tree Protocol

Link Aggregation

  • IEEE 802.3ad: Link Aggregation Control Protocol
  • 802.3ad (LACP) support:
    • Number of LAGs supported: 112
    • Maximum number of ports per LAG: 8
  • LAG load-sharing algorithm bridged or routed (unicast or multicast) traffic:
    • IP: S/D IP
    • TCP/UDP: S/D IP, S/D Port
    • Non-IP: S/D MAC
  • Tagged ports support in LAG

Layer 3 Features: IPv4

  • Maximum number of ARP entries: 64,000
  • Maximum number of IPv4 unicast routes in hardware: 32,000
  • Maximum number of IPv4 multicast routes in hardware: 8,000
  • Routing protocols: RIPv1/v2, OSPF, BGP, IS-IS
  • Static routing
  • Routing policy
  • Bidirectional Forwarding Detection (BFD)
  • Layer 3 redundancy: Virtual Router Redundancy Protocol (VRRP)

Layer 3 Features: IPv6

  • Maximum number of Neighbor Discovery (ND) entries: 20,000 (shared with IPv4)
  • Maximum number of IPv6 unicast routes in hardware: 18,000
  • Maximum number of IPv6 multicast routes in hardware: 4,000
  • Routing protocols: RIPng, OSPFv3, IPv6, ISIS
  • Static routing

Access Control Lists (ACLs) (Junos OS Firewall Filters)

  • Port-based ACL (PACL): Ingress and egress
  • VLAN-based ACL (VACL): Ingress and egress
  • Router-based ACL (RACL): Ingress and egress
  • ACL entries (ACE) in hardware per system:
    • Port-based ACL (PACL) ingress: 3,500
    • VLAN-based ACL (VACL) ingress: 3,500
    • Router-based ACL (RACL) ingress: 7,000
    • Egress shared across PACL, VACL, and RACL: 1,000
  • ACL counter for denied packets
  • ACL counter for permitted packets
  • Ability to add/remove/change ACL entries in middle of list (ACL editing)
  • L2-L4 ACL
  • 802.1X port-based
  • 802.1X multiple supplicants
  • 802.1X with VLAN assignment
  • 802.1X with authentication bypass access (based on host MAC address)
  • 802.1X with VoIP VLAN support
  • 802.1X dynamic ACL based on RADIUS attributes
  • 802.1X Supported Extensible Authentication Protocol (EAP types): Message Digest 5 (MD5), Transport Layer Security (TLS), Tunneled TLS (TTLS), Protected Extensible Authenticated Protocol (PEAP)
  • MAC authentication (RADIUS)
  • Control plane DoS protection

High Availability

  • Redundant, hot-swappable power supplies
  • Redundant, field-replaceable, hot-swappable fans
  • Graceful Routing Engine switchover (GRES) for Layer 2 hitless forwarding and Layer 3 protocols on RE failover
  • Graceful protocol restart (OSPF, BGP)
  • Layer 2 hitless forwarding on RE failover
  • Non-Stop Bridging - LACP, xSTP
  • Non-Stop Routing - PIM, OSPF v2 and v3, RIP v2, RIPnG, BGP, BGPv6, ISIS, IGMP v1, v2, v3
  • Online insertion and removal (OIR) uplink module

Quality of Service

  • Layer 2 QoS
  • Layer 3 QoS
  • Ingress policing: 1 rate 2 color
  • Hardware queues per port: 12
  • Scheduling methods (egress): Strict priority (SP), weighted deficit round robin (wDRR)
  • 802.1p, DiffCode (DSCP)/IP Precedence trust and marking
  • L2-L4 classification criteria: Interface, MAC address, Ethertype, 802.1p, VLAN, IP address, DSCP/IP Precedence, TCP/UDP port numbers, and more
  • Congestion avoidance capabilities: Tail drop, weighted random early detection (wRED)


  • IGMP: v1, v2, v3
  • IGMP snooping


  • VRF-Lite

Traffic Monitoring

  • ACL-based mirroring
  • Mirroring destination ports per system: 1
  • LAG port monitoring
  • Multiple destination ports monitored to 1 mirror (N:1)
  • Maximum number of mirroring sessions: 4
  • Mirroring to remote destination (over L2): 1 destination VLAN
Services and Manageability
  • Junos OS CLI
  • web interface
  • Out-of-band management: Serial; 10/100/1000BASE-T Ethernet
  • ASCII configuration
  • Rescue configuration
  • Configuration rollback
  • Image rollback
  • LCD management
  • Element management tools: Juniper Networks Network and Security Manager (NSM)
  • Remote performance monitoring
  • Proactive services support via Advanced Insight Solutions (AIS)
  • SNMP: v1, v2c, v3
  • RMON (RFC 2819) Groups 1, 2, 3, 9
  • Network Time Protocol (NTP)
  • DHCP server
  • DHCP client and DHCP proxy
  • DHCP relay and helper
  • DHCP local server support
  • Junos Space Service Now for automated fault detection, simplified trouble ticket management, and streamlined operations
  • SSHv2
  • Secure copy
  • Domain Name System (DNS) resolver
  • System logging
  • Temperature sensor
  • Configuration backup via FTP/secure copy

Supported RFCs

  • RFC 768 UDP
  • RFC 783 TFTP
  • RFC 791 IP
  • RFC 792 ICMP
  • RFC 793 TCP
  • RFC 826 ARP
  • RFC 854 Telnet client and server
  • RFC 894 IP over Ethernet
  • RFC 903 RARP
  • RFC 906 TFTP Bootstrap
  • RFC 951, 1542 BootP
  • RFC 1027 Proxy ARP
  • RFC 1058 RIP v1
  • RFC 1112 IGMP v1
  • RFC 1122 Host Requirements
  • RFC 1195 Use of OSI IS-IS for Routing in TCP/IP and Dual Environments (TCP/IP transport only)
  • RFC 1256 IPv4 ICMP Router Discovery (IRDP)
  • RFC 1492 TACACS+
  • RFC 1519 CIDR
  • RFC 1587 OSPF NSSA Option
  • RFC 1591 DNS
  • RFC 1812 Requirements for IP Version 4 Routers
  • RFC 1981 Path MTU Discovery for IPv6
  • RFC 2030 SNTP, Simple Network Time Protocol
  • RFC 2068 HTTP server
  • RFC 2080 RIPng for IPv6
  • RFC 2131 BOOTP/DHCP relay agent and DHCP server
  • RFC 2138 RADIUS Authentication
  • RFC 2139 RADIUS Accounting
  • RFC 2154 OSPF w/Digital Signatures (Password, MD-5)
  • RFC 2236 IGMP v2
  • RFC 2267 Network Ingress Filtering
  • RFC 2328 OSPF v2 (Edge-mode)
  • RFC 2338 VRRP
  • RFC 2362 PIM-SM (Edge-mode)
  • RFC 2370 OSPF Opaque LSA Option
  • RFC 2453 RIP v2
  • RFC 2460 Internet Protocol, Version 6 (IPv6) Specification
  • RFC 2461 Neighbor Discovery for IP Version 6 (IPv6)
  • RFC 2463 Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification
  • RFC 2464 Transmission of IPv6 Packets over Ethernet Networks
  • RFC 2474 DiffServ Precedence, including 12 queues/port
  • RFC 2475 DiffServ Core and Edge Router Functions
  • RFC 2526 Reserved IPv6 Subnet Anycast Addresses
  • RFC 2597 DiffServ Assured Forwarding (AF)
  • RFC 2598 DiffServ Expedited Forwarding (EF)
  • RFC 2740 OSPF for IPv6
  • RFC 2925 MIB for Remote Ping, Trace
  • RFC 3176 sFlow
  • RFC 3376 IGMP v3
  • RFC 3484 Default Address Selection for Internet Protocol Version 6 (IPv6)
  • RFC 3513 Internet Protocol Version 6 (IPv6) Addressing Architecture
  • RFC 3569 draft-ietf-ssm-arch-06.txt PIM-SSM PIM Source Specific Multicast
  • RFC 3579 RADIUS EAP support for 802.1x
  • RFC 3618 Multicast Source Discovery Protocol (MSDP)
  • RFC 3623 OSPF Graceful Restart
  • RFC 4213 Basic Transition Mechanisms for IPv6 Hosts and Routers
  • RFC 4291 IP Version 6 Addressing Architecture
  • RFC 4443 ICMPv6 for the IPv6 Specification
  • RFC 4541 IBMP and MLD snooping services
  • RFC 4861 Neighbor Discovery for IPv6
  • RFC 4862 IPv6 Stateless Address Autoconfiguration
  • RFC 4915 MT-OSPF
  • RFC 5176 Dynamic Authorization Extensions to RADIUS
  • RFC 5798 VRRPv3 for IPv6
  • Draft-ietf-bfd-base-05.txt Bidirectional Forwarding Detection
  • Draft-ietf-idr-restart-10.txt Graceful Restart Mechanism
  • Draft-ietf-isis-restart-02 Restart Signaling for IS-IS
  • Draft-ietf-isis-wg-multi-topology-11 Multi Topology (MT) Routing in IS-IS for BGP
  • Internet draft-ietf-isis-ipv6-06.txt, Routing IPv6 with IS-IS
  • LLDP Media Endpoint Discovery (LLDP-MED), ANSI/TIA-1057, draft 08
  • PIM-DM Draft IETF PIM Dense Mode draft-ietf-idmr-pim-dm-05. txt, draft-ietf-pim-dm-new-v2-04.txt

Supported MIBs

  • RFC 1155 SMI
  • RFC 1157 SNMPv1
  • RFC 1212, RFC 1213, RFC 1215 MIB-II, Ethernet-Like MIB and TRAPs
  • RFC 1493 Bridge MIB
  • RFC 1643 Ethernet MIB
  • RFC 1657 BGP-4 MIB
  • RFC 1724 RIPv2 MIB
  • RFC 1850 OSPFv2 MIB
  • RFC 1905 RFC 1907 SNMP v2c, SMIv2 and Revised MIB-II
  • RFC 2011 SNMPv2 for Internet Protocol using SMIv2
  • RFC 2012 SNMPv2 for transmission control protocol using SMIv2
  • RFC 2013 SNMPv2 for user datagram protocol suing SMIv2
  • RFC 2096 IPv4 Forwarding Table MIB
  • RFC 2287 System Application Packages MIB
  • RFC 2570 - 2575 SNMPv3, user based security, encryption, and authentication
  • RFC 2576 Coexistence between SNMP Version 1, Version 2, and Version 3
  • RFC 2578 SNMP Structure of Management Information MIB
  • RFC 2579 SNMP Textual Conventions for SMIv2
  • RFC 2665 Ethernet-like interface MIB
  • RFC 2787 VRRP MIB
  • RFC 2819 RMON MIB
  • RFC 2863 Interface Group MIB
  • RFC 2863 Interface MIB
  • RFC 2922 LLDP MIB
  • RFC 2925 Ping/Traceroute MIB
  • RFC 2932 IPv4 Multicast MIB
  • RFC 3413 SNMP Application MIB
  • RFC 3414 User-based Security model for SNMPv3
  • RFC 3415 View-based Access Control Model for SNMP
  • RFC 3621 PoE-MIB (PoE switches only)
  • RFC 4188 STP and Extensions MIB
  • RFC 4363 Definitions of Managed Objects for Bridges with Traffic Classes, Multicast Filtering, and VLAN extensions
  • RFC 5643 OSPF v3 MIB support
  • Draft - blumenthal - aes - usm - 08
  • Draft - reeder - snmpv3 - usm - 3desede -00
  • Draft-ietf-bfd-mib-02.txt
  • Draft-ietf-idmr-igmp-mib-13
  • Draft-ietf-idmr-pim-mib-09
  • Draft-ietf-idr-bgp4-mibv2-02.txt - Enhanced BGP-4 MIB
  • Draft-ietf-isis-wg-mib-07


  • Debugging: CLI via console, Telnet, or SSH
  • Diagnostics: Show and debug cmd, statistics
  • Traffic mirroring (port)
  • Traffic mirroring (VLAN)
  • IP tools: Extended ping and trace
  • Juniper Networks commit and rollback


Top Front View
Top Front View

Front View
Front View
Rear View
Rear View
Left Angle View
Left Angle View
Right Angle View
Right Angle View


Download the Juniper Networks EX4300 Series Data Sheet (PDF).

Pricing Notes:

EX4300 Switches
UK: FREE DeliveryEX4300, 48-port 10/100/1000BaseT
*Includes 1 PSU JPSU-350-AC-AFO; 40GE QSFP+ to be ordered seperately for virtual chassis connections; optics sold seperately
Our Price: £5,611.40
Inc. VAT: £6,733.68
Juniper Care
Juniper Care Core Support for EX4300-48T
Our Price: Request a Quote
Juniper Care Core Plus Support for EX4300-48T
Our Price: Request a Quote
Juniper Care Next Day Onsite Support for EX4300-48T
Our Price: Request a Quote
Juniper Care Next Day Support for EX4300-48T
Our Price: Request a Quote
Juniper Care Same Day Onsite Support for EX4300-48T
Our Price: Request a Quote
Juniper Care Same Day Support for EX4300-48T
Our Price: Request a Quote
Feature Licenses
Advanced Feature License (AFL) for EX430048T, EX4300-48T-AFI, EX4300-48T-DC, EX4300-48T-AFI-DC, and EX4300-48P switches
Our Price: £3,005.48
Inc. VAT: £3,606.58
Enhanced Feature License (EFL) for EX430048T, EX4300-48T-AFI, EX4300-48T-DC, EX4300-48T-AFI-DC, and EX4300-48P switches
Our Price: £699.36
Inc. VAT: £839.23
Mounting Options
Adjustable 4-post rack-mount kit for EX4200, EX4300, and EX3200
Our Price: £315.84
Inc. VAT: £379.01
EX4200, EX4300, and EX3200 wall-mountkit
List Price: £163.70
Our Price: Request a Quote
Rack Mount Kit for EX2200, EX3200, EX4200, EX4300 and EX4550
Our Price: £70.19
Inc. VAT: £84.23
Uplink Modules
EX4300 4-port 1GbE/10GbE SFP+ Uplink Module
Our Price: £1,400.22
Inc. VAT: £1,680.26
Power Supplies
EX 4300 350 w AC power supply (power cord needs to be ordered separately) (Frontto-back airflow)
Our Price: £347.42
Inc. VAT: £416.90
EX 4300 350 w AC power supply with airflow in (power cord needs to be ordered separately) (Back-to-front airflow)
Our Price: £347.42
Inc. VAT: £416.90
EX 4300 715 w AC power supply (power cord needs to be ordered separately) (Front-toback airflow)
Our Price: £698.35
Inc. VAT: £838.02
EX 4300 1100 w AC power supply (power cord needs to be ordered separately) (Frontto-back airflow)
Our Price: £1,049.29
Inc. VAT: £1,259.15
EX 4300 550 w DC power supply (power cord needs to be ordered separately) (Frontto-back airflow)
Our Price: £557.98
Inc. VAT: £669.58
EX 4300 550 w DC power supply with air flow in (power cord needs to be ordered separately) (Back-to-front airflow)
Our Price: £557.98
Inc. VAT: £669.58
Pluggable Optics
QSFP+ to QSFP+ 40 Gigabit Ethernet Direct Attach Copper (twinax copper cable) 50cm Passive
Our Price: £140.37
Inc. VAT: £168.44
QSFP+ 40GBase-SR4 40GbE Optics, 850 nm for up to 150 m transmission on multimode fiber-optic (MMF)
List Price: £3,274.00
Our Price: Request a Quote
QSFP+ to QSFP+ 40GbE Direct Attach Copper (twinax copper cable) 1 m passive
Our Price: £210.56
Inc. VAT: £252.67
QSFP+ to QSFP+ 40GbE Direct Attach Copper (twinax copper cable) 3 m passive
Our Price: £280.75
Inc. VAT: £336.90
QSFP+ to QSFP+ 40GbE Direct Attach Copper (twinax copper cable) 5 m passive
List Price: £818.50
Our Price: Request a Quote
SFP 1000BASE-SX; LC connector; 850 nm; 550 m reach on multimode fiber
Our Price: £350.93
Inc. VAT: £421.12
ENET 1000BASE-SX SFP Transceiver for MMF 850nm LC CONN
*OEM Part Number: EX-SFP-1GE-SX
Our Price: Request a Quote
SFP 1000BASE-LX; LC connector; 1,310 nm; 10 km reach on single-mode fiber
Our Price: £701.86
Inc. VAT: £842.23
ENET 1000BASE-LX/LH SFP Transceiver for MMF AND SMF 1310nm LC CONN.
*OEM Part Number: EX-SFP-1GE-LX
Our Price: Request a Quote
Small Form Factor Pluggable 10 Gigabit Ethernet SR Optics
Our Price: £1,052.80
Inc. VAT: £1,263.36
ENET 10GBASE-SR SFP+ Transceiver for MMF 850nm LC CONN
*OEM Part Number: EX-SFP-10GE-SR
Our Price: Request a Quote
SFP+ 10GBASE-LRM; LC connector; 1,310 nm; 220 m reach on multimode fiber
Our Price: £1,228.26
Inc. VAT: £1,473.91
Small Form Factor Pluggable 10 Gigabit Ethernet LR Optics
Our Price: £2,807.46
Inc. VAT: £3,368.95
ENET 10GBASE-LR SFP+ Transceiver for SMF 1310nm LC CONN
*OEM Part Number: EX-SFP-10GE-LR
Our Price: Request a Quote
SFP+ 10 Gigabit Ethernet Direct Attach Copper (twinax copper cable) 1m
Our Price: £105.28
Inc. VAT: £126.34
ENET 10GBase-CU 1m Twinax Cable, 30AWG SFP+ Cable Assembly
*OEM Part Number: EX-SFP-10GE-DAC-1M
Our Price: Request a Quote
SFP+ 10 Gigabit Ethernet Direct Attach Copper (twinax copper cable) 3m
Our Price: £147.39
Inc. VAT: £176.87
ENET 10GBase-CU 3m Twinax Cable, 30AWG SFP+ Cable Assembly
*OEM Part Number: EX-SFP-10GE-DAC-3M
Our Price: Request a Quote
SFP+ 10 Gigabit Ethernet Direct Attach Copper (twinax copper cable) 5m
Our Price: £182.48
Inc. VAT: £218.98
ENET 10GBase-CU 5m Twinax Cable, 30AWG SFP+ Cable Assembly
*OEM Part Number: EX-SFP-10GE-DAC-5M
Our Price: Request a Quote
SFP+ 10GbE Direct Attach Copper (twinax copper cable), 7 meters
Our Price: £210.56
Inc. VAT: £252.67
SFP+ 10GBASE-ER 10GbE Optics, 1,550 nm for 40 km transmission on single-mode fiber
Our Price: £7,018.64
Inc. VAT: £8,422.37
SFP+ 10GbE Ultra Short Reach Optics, 850 nm for 10 m on OM1, 20 m on OM2, 100 m on OM3 multimode fiber
Our Price: £526.40
Inc. VAT: £631.68