PLEASE NOTE: STANDARD AIRFLOW IS AFI
The Juniper Networks EX4300-48T Ethernet Switch is a high-performance, fixed-configuration access switch designed for enterprise campus networks, branch deployments, and data center environments. Equipped with 48 Gigabit Ethernet (10/100/1000BASE-T) copper ports and four high-speed 40GbE QSFP+ uplink ports, the EX4300-48T delivers reliable connectivity, scalable performance, and simplified network management for modern IT infrastructures.
Built on the robust Junos operating system, the EX4300-48T provides carrier-grade reliability, advanced Layer 2 and Layer 3 capabilities, and consistent automation features across Juniper networking platforms. With a switching capacity of up to 496 Gbps and a forwarding rate of 369 Mpps, this switch ensures wire-speed performance and low latency for bandwidth-intensive applications such as virtualization, cloud services, and large enterprise workloads.
One of the standout capabilities of the Juniper EX4300 Series is Virtual Chassis technology, which allows up to 10 switches to be interconnected and managed as a single logical device. This architecture simplifies network operations, reduces management complexity, and enables a flexible pay-as-you-grow scalability model. The integrated 40GbE QSFP+ ports can also function as Virtual Chassis Ports (VCPs), enabling high-speed stacking and aggregation.
The EX4300-48T also supports advanced networking features including IPv4/IPv6 routing protocols such as OSPF, BGP, and IS-IS, along with Data Center Bridging (DCB) and hardware-based VXLAN Layer 2 gateway capabilities. These features allow seamless integration into modern data center fabrics and software-defined networking architectures.
Designed for operational reliability, the switch includes redundant hot-swappable power supplies, field-replaceable fan trays, and flexible airflow options, ensuring high availability in mission-critical environments. Whether deployed at the enterprise access layer, campus distribution layer, or data center top-of-rack, the Juniper EX4300-48T provides a scalable, high-density switching solution for performance-driven networks.
Product Specifications – Juniper Networks EX4300-48T Ethernet Switch (48-Port 1GbE with 40GbE Uplinks)
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| Specification |
Details |
| Product Name |
Juniper Networks EX4300-48T Ethernet Switch |
| Manufacturer |
Juniper Networks |
| Part Number |
EX4300-48T |
| Product Type |
Fixed-Configuration Ethernet Access Switch |
| Switch Series |
Juniper EX4300 Series |
| Deployment Type |
Enterprise Campus Access, Aggregation, Data Center Top-of-Rack |
| Total Access Ports |
48 × 10/100/1000BASE-T (RJ-45) |
| PoE Support |
No (PoE+ supported on EX4300-48P model) |
| Uplink Ports |
4 × 40GbE QSFP+ (Fixed) |
| Port Speed |
1GbE access ports with 40GbE uplinks |
| Switching Capacity |
Up to 496 Gbps |
| Forwarding Rate |
Up to 369 Million Packets per Second (Mpps) |
| Virtual Chassis Support |
Yes – up to 10 switches |
| Virtual Chassis Bandwidth |
Up to 320 Gbps stacking bandwidth |
| Mixed Virtual Chassis |
Supported with EX4300 and EX4600 |
| Operating System |
Junos OS |
| Management Interfaces |
CLI, SNMP, NETCONF, Junos Space, REST APIs |
| Routing Protocols Supported |
Static Routing, RIP, OSPF (v2/v3), BGP, IS-IS |
| Layer Support |
Layer 2 and Layer 3 switching and routing |
| VLAN Support |
IEEE 802.1Q VLAN tagging |
| Spanning Tree Protocols |
STP, RSTP, MSTP |
| Link Aggregation |
IEEE 802.3ad (LACP) |
| Data Center Bridging (DCB) |
Supported |
| VXLAN Support |
Hardware-based VXLAN Layer 2 Gateway |
| QoS Support |
Advanced QoS with traffic classification and shaping |
| Multicast Protocols |
IGMP v1/v2/v3, PIM-SM, PIM-SSM |
| Security Features |
MACsec support, ACLs, DHCP Snooping, Dynamic ARP Inspection |
| Power Supply |
2 × Redundant Hot-Swappable AC or DC Power Supplies |
| Power Supply Type |
AC or DC options available |
| Cooling System |
Field-replaceable fan trays |
| Airflow Direction |
Front-to-Back (Standard) or Back-to-Front (Optional) |
| Latency |
Low latency architecture suitable for data center workloads |
| Jumbo Frame Support |
Up to 9,216 bytes |
| Stacking Ports |
40GbE QSFP+ ports can be used as Virtual Chassis Ports (VCPs) |
| Form Factor |
1U Rack Mount |
| Rack Units |
1 RU |
| Typical Power Consumption |
~180–250 W depending on configuration |
| Operating Temperature |
0°C to 45°C |
| Storage Temperature |
-40°C to 70°C |
| Deployment Scenarios |
Enterprise access layer, campus aggregation, data center top-of-rack networking |
FAQs:
Q1. What is the difference between the EX4300-48T and the EX4300-48P?
The "T" in 48T stands for "Trio/Termination" (standard copper), while "P" in 48P stands for PoE+. The EX4300-48T does not provide Power over Ethernet for devices like IP phones or APs.
Q2. Can I use 10GbE uplinks on this switch?
Yes. While the 40GbE ports are fixed, you can add an optional uplink module (such as the EX-UM-4X4SFP) to the expansion slot to gain four 10GbE SFP+ ports.
Q3. Does this switch support front-to-back airflow?
Yes. The standard configuration is front-to-back. However, by selecting specific power supplies and fan modules (AFI models), you can configure the switch for back-to-front airflow for hot-aisle/cold-aisle data center designs.
Q4. Are the stacking cables included?
No. Stacking requires either QSFP+ DAC cables for the fixed ports or specialized Virtual Chassis cables if using the dedicated VCP ports on the rear.
Q5. How many MAC addresses does the EX4300-48T support?
The switch supports up to 64,000 MAC addresses, making it highly capable for large-scale enterprise campus environments.
