The Juniper Networks EX4300 Multigigabit Ethernet Switch is a high-performance access switching platform designed for advanced enterprise branch and campus network environments.

Modern enterprise networks increasingly need to support connected devices that require both higher bandwidth and greater Power over Ethernet capacity. The EX4300 Multigigabit platform provides access speeds ranging from 100 Mbps to 10GbE, together with PoE++ capabilities delivering up to 95W per port.

This makes the platform suitable for devices such as:

• Wi-Fi 6 access points
• 802.11ac access points
• High-density IP telephony
• Surveillance cameras
• Sensors
• Virtual Desktop Infrastructure terminals
• Other high-power connected devices

The EX4300 Multigigabit is also cloud-ready and Zero-Touch Provisioning enabled, allowing organizations to onboard, configure, monitor, and manage the switch through Juniper Mist Wired Assurance.

Cloud-Ready Network Management

The EX4300 Multigigabit integrates with the Juniper Mist Cloud, providing centralized cloud-based management for campus switching environments.

Juniper Mist Wired Assurance allows administrators to:

• Claim switches
• Configure switches
• Monitor network health
• Troubleshoot connected devices
• View service-level expectations
• Analyze network performance

Mist AI uses rich streaming telemetry from EX switches to provide greater visibility into switch health and network anomalies.

These capabilities can help organizations simplify network operations and reduce Mean Time to Repair.

Features and Benefits

Juniper Mist Wired Assurance

Juniper Mist Wired Assurance provides AI-driven management and automation for connected network environments.

Administrators can claim, configure, and troubleshoot EX4300 switches through the cloud using a simplified management interface.

The platform also provides streaming telemetry data for:

• Switch health monitoring
• Anomaly detection
• Connected-device performance
• Wired service-level expectations

This helps network teams improve operational efficiency across both wired and wireless environments.

Virtual Chassis

The EX4300 Multigigabit supports Juniper Virtual Chassis technology.

Up to:

• 10 EX4300 switches

can be interconnected and operated as a single logical device.

Virtual Chassis helps:

• Simplify network management
• Reduce operational complexity
• Improve scalability
• Provide a pay-as-you-grow deployment model

EX4300 switches can also be combined with selected EX4600 switches within a Virtual Chassis environment.

PoE++

The EX4300 Multigigabit supports:

• IEEE 802.3bt PoE++

The platform can provide up to:

• 95W per port

This higher power capacity supports devices that require more than standard PoE or PoE+ power levels.

Examples include:

• Access points
• IP phones
• VDI terminals
• High-power network devices

MACsec AES-256 Support

The EX4300 Multigigabit supports:

• IEEE 802.1AE MACsec
• AES-256 encryption

MACsec provides link-layer:

• Data confidentiality
• Data integrity
• Data-origin authentication

The platform provides up to:

• 88 Gbps near line-rate hardware-based encryption

on supported 1GbE and 10GbE interfaces.

All access and uplink ports on the EX4300 Multigigabit platform support MACsec AES-256.

Campus Fabric

The EX4300 supports modern campus fabric architectures using:

• EVPN
• VXLAN

Switches can be interconnected through an IP fabric with an EVPN-VXLAN overlay.

This architecture allows organizations to extend the IP fabric across:

• Multiple enterprise buildings
• Campus environments
• Different network segments

VXLAN also allows Layer 2 connectivity to be extended across the network.

EX4300 Product Description

The Juniper Networks EX4300 family combines the reliability traditionally associated with modular switching platforms with the flexibility and economics of stackable Ethernet switches.

The EX4300 provides a scalable platform for:

• Campus access
• Enterprise branches
• Data center access
• Aggregation
• Small campus core deployments

The family includes both:

• Standard 1GbE access models
• Multigigabit Ethernet models

Scalable Network Expansion

Organizations can initially deploy a single:

• 24-port EX4300
• 48-port EX4300

As network requirements increase, Juniper Virtual Chassis technology allows up to 10 switches to be interconnected and managed as one logical device.

This provides a scalable architecture that can grow alongside changing network requirements.

Fiber Aggregation

A pair of 32-port EX4300 fiber switches can also be deployed as:

• Consolidated aggregation switches
• Small core switches

This provides an additional deployment option for fiber-based network environments.

Integration with QFX5100

The EX4300 can integrate with the Juniper Networks QFX5100 Series of 10GbE and 40GbE data center access switches.

They can operate within a single stack or Virtual Chassis environment, helping simplify:

• Mixed access environments
• 10GbE server upgrades
• Centralized network management

320 Gbps Virtual Chassis Backplane

EX4300 switches can be interconnected using multiple:

• 40GbE QSFP+ ports

These connections can provide a:

• 320 Gbps Virtual Chassis backplane

This high-speed interconnect helps maintain performance across stacked switches.

Flexible Uplink Connectivity

An optional uplink module is available with support for:

• 1GbE
• 10GbE

This enables high-speed connectivity between EX4300 access switches and aggregation or core network layers.

High Availability

EX4300 switches include several high-availability capabilities commonly associated with modular chassis systems.

These include:

• Hot-swappable fans
• Redundant internal power supplies
• Hot-swappable power supplies
• Modular Junos OS
• Dual Routing Engines in Virtual Chassis deployments
• Graceful Routing Engine Switchover
• Single management interface
• Centralized software upgrades

These capabilities are designed to improve network availability and simplify administration.

Junos Operating System

The EX4300 uses the modular Juniper Networks Junos operating system.

Junos OS is also used across other Juniper:

• Switches
• Routers
• Security platforms

This provides a consistent operational approach across the Juniper network infrastructure.

Each EX4300 includes:

• ASIC-based Packet Forwarding Engine
• Integrated Routing Engine

The Routing Engine provides control-plane functionality while the Packet Forwarding Engine handles network traffic forwarding.

Network Scalability

The EX4300 platform can scale from:

• 24 to 480 x 10/100/1000BASE-T ports
• 24 to 240 x 100/1000/2500/5000/10000BASE-T ports

The platform can also support up to:

• 40 x 10GbE uplinks
• 40 x 40GbE uplinks

For multigigabit configurations, the platform can support up to:

• 40 x 10GbE uplinks
• 20 x 40GbE uplinks
• 20 x 100GbE uplinks

These are available in addition to the dedicated 40Gbps Virtual Chassis interfaces.

EX4300-48MP Multigigabit Switch

The EX4300-48MP is the multigigabit configuration within the EX4300 family.

Access Port Configuration

The switch provides:

• 24 x 10/100/1000BASE-T ports
• 24 x 100/1000/2500/5000/10000BASE-T multigigabit ports

This provides a total of:

• 48 access ports

Power over Ethernet

The EX4300-48MP provides:

• 48 PoE/PoE+ ports
• PoE++ support
• Maximum PoE budget of 1100W
• Up to 95W per supported access port

10GbE Connectivity

The switch provides:

• 24 native 10GbE-capable ports
• Up to 28 x 10GbE ports with an optional module

40GbE Connectivity

The EX4300-48MP includes:

• 4 dedicated 40GbE QSFP+ ports

The page also lists:

• Up to 2 x 40GbE through the optional module configuration

The dedicated 40GbE ports can be used to create the Virtual Chassis backplane.

100GbE Connectivity

The EX4300-48MP supports:

• Up to 2 x 100GbE ports with the appropriate module

Power Supply

The switch uses:

• 1400W AC power supply

Airflow

The standard configuration provides:

• AFO – Front-to-Back airflow

Standard EX4300 Models

The EX4300 family also includes standard copper and fiber configurations.

EX4300-24T

The EX4300-24T provides:

Access Ports

• 24 x 10/100/1000BASE-T ports

PoE

• No PoE
• 0W PoE budget

10GbE

• No native 10GbE ports
• Up to 4 x 10GbE ports with optional module

40GbE

• 4 x 40GbE ports

100GbE

• No 100GbE connectivity

Power Supply

• 350W AC

Airflow

• AFO – Front-to-Back

EX4300-24P

The EX4300-24P combines 24-port Gigabit Ethernet connectivity with PoE+ support.

Access Ports

• 24 x 10/100/1000BASE-T ports

PoE

• 24 PoE/PoE+ ports
• 550W PoE budget

10GbE

• Up to 4 x 10GbE ports with optional module

40GbE

• 4 x 40GbE ports

100GbE

• No 100GbE ports

Power Supply

• 715W AC

Airflow

• AFO – Front-to-Back

EX4300-48T

The EX4300-48T provides a high-density non-PoE Gigabit Ethernet configuration.

Access Ports

• 48 x 10/100/1000BASE-T ports

PoE

• No PoE
• 0W PoE budget

10GbE

• Up to 4 x 10GbE ports with optional module

40GbE

• 4 x 40GbE ports

100GbE

• No 100GbE ports

Power Supply

• 350W AC

Airflow

• AFO – Front-to-Back

EX4300-48P

The EX4300-48P provides a 48-port PoE+ configuration.

Access Ports

• 48 x 10/100/1000BASE-T ports

PoE

• 48 PoE/PoE+ ports
• 900W PoE budget

10GbE

• Up to 4 x 10GbE ports with optional module

40GbE

• 4 x 40GbE ports

100GbE

• No 100GbE ports

Power Supply

• 1100W AC

Airflow

• AFO – Front-to-Back

EX4300-48T-AFI

The EX4300-48T-AFI provides the same 48-port non-PoE access configuration with reverse airflow.

Access Ports

• 48 x 10/100/1000BASE-T ports

PoE

• No PoE

High-Speed Connectivity

• Up to 4 x 10GbE ports with module
• 4 x 40GbE ports
• No 100GbE ports

Power Supply

• 350W AC

Airflow

• AFI – Back-to-Front

EX4300-48T-DC

The EX4300-48T-DC provides:

• 48 x 10/100/1000BASE-T ports
• No PoE
• Up to 4 x 10GbE ports with module
• 4 x 40GbE ports
• No 100GbE ports
• 550W DC power supply
• AFO front-to-back airflow

EX4300-48T-DC-AFI

The EX4300-48T-DC-AFI provides:

• 48 x 10/100/1000BASE-T ports
• No PoE
• Up to 4 x 10GbE ports with module
• 4 x 40GbE ports
• No 100GbE ports
• 550W DC power supply
• AFI back-to-front airflow

EX4300 Fiber Models

EX4300-32F

The EX4300-32F is a fiber-based configuration.

Access Ports

• 32 x 100/1000BASE-X ports

PoE

• No PoE
• 0W PoE budget

10GbE

• 4 native 10GbE ports
• Up to 12 x 10GbE ports with optional module

40GbE

• 2 native 40GbE ports
• Up to 4 x 40GbE ports with module

100GbE

• No 100GbE ports

Power Supply

• 350W AC

Airflow

• AFO – Front-to-Back

EX4300-32F-DC

The EX4300-32F-DC provides:

• 32 x 100/1000BASE-X fiber ports
• No PoE
• 4 native 10GbE ports
• Up to 12 x 10GbE ports with module
• 2 native 40GbE ports
• Up to 4 x 40GbE ports with module
• No 100GbE ports
• 550W DC power supply
• AFO front-to-back airflow

EX4300 Multigigabit Platform Specifications

Form Factor

The EX4300 platform uses a:

• 1RU form factor

Port Density

Available connectivity includes:

• 100M
• 1GbE
• 2.5GbE
• 5GbE
• 10GbE
• 25GbE
• 40GbE
• 100GbE uplink options

Power

The EX4300 Multigigabit platform supports:

• PoE
• PoE+
• PoE++
• Up to 95W per port

Switching Capacity

The platform provides:

• 960 Gbps switching capacity

Fabric

Supported fabric technologies include:

• EVPN-VXLAN
• Virtual Chassis

High-Performance Multigigabit Switching for Campus Networks

The Juniper EX4300 Multigigabit Ethernet Switch provides a scalable platform for enterprise campus, branch, data center access, aggregation, and small core network environments.

With access speeds ranging from 100 Mbps to 10GbE, PoE++ up to 95W per port, 40GbE and 100GbE connectivity options, a 320 Gbps Virtual Chassis backplane, EVPN-VXLAN campus fabrics, MACsec AES-256 encryption, and Juniper Mist cloud management, the EX4300 provides a flexible switching foundation for high-performance enterprise networks.