Juniper EX4300 Series 48-Ports 10/100/1000BASE-T Ethernet Layer 3 Rack-mountable Managed Network Switch – EX4300-48T

Juniper EX4300-48T 48-Port GbE Layer 3 Access Switch

The Juniper EX4300-48T is a 48-port 10/100/1000BASE-T Layer 3 managed access switch with 4 x QSFP+ uplink and stacking ports — delivering enterprise GbE access connectivity with Virtual Chassis scalability, full Junos OS routing, and a compact 1U form factor for campus wiring closet and enterprise access layer deployments.

Key Features

• 48 x 10/100/1000BASE-T copper ports for universal GbE access connectivity
• 4 x QSFP+ ports for 40GbE uplinks or Virtual Chassis inter-switch stacking
• Virtual Chassis support for stacking up to 10 EX4300 switches as a single device
• Full Layer 3 routing via Junos OS for consistent enterprise network policy
• 1U rack-mountable form factor for standard wiring closet deployment

Product Specifications

• Part Number: EX4300-48T
• Manufacturer: Juniper Networks
• Access Ports: 48 x 10/100/1000BASE-T
• Uplink/Stacking Ports: 4 x QSFP+ (40GbE)
• Switching Capacity: 128 Gbps
• Forwarding Rate: 95.2 Mpps
• Form Factor: 1U Rack-mountable

Switch & Port Specifications

• MAC Address Table: 32,000 entries
• VLAN Support: 4,094 VLANs
• Jumbo Frames: 9,216 bytes
• PoE: No (non-PoE — see EX4300-48P for PoE model)
• Stacking: Virtual Chassis via QSFP+ ports (up to 10 switches)
• Redundancy: Optional redundant PSU

Network & Protocol Specifications

• Routing: OSPFv2/v3, BGP, IS-IS, RIP v1/v2, VRRP, static routing
• Multicast: PIM SM/SSM, IGMP v1/v2/v3 snooping
• Security: 802.1X, MAC RADIUS, ACLs, DHCP snooping, DAI, IP source guard
• QoS: 8 queues per port, DSCP, 802.1p, WRED
• Management: Junos OS CLI, NETCONF, SNMP v1/v2c/v3

Use Cases

• Campus wiring closet GbE access with 48-port copper connectivity and 40G QSFP+ uplinks
• Enterprise access layer Virtual Chassis deployment stacking up to 10 EX4300 switches
• Replacing end-of-life EX3300 or EX2200 switches with current-generation Junos access platforms
• Mixed-campus access deployments combining EX4300-48T and EX4300-48P PoE models

Compatibility

• Stacks with other EX4300 models via Virtual Chassis (up to 10 members)
• Compatible with standard QSFP+ 40G transceivers and QSFP+ DAC cables for uplinks and stacking
• Junos OS ensures consistent policy with EX2300, EX4100, and EX4400 series platforms
• Optional redundant PSU available (JPSU-350-AC-AFO or equivalent)

Frequently Asked Questions

How many EX4300-48T switches can form a Virtual Chassis?

The EX4300 supports Virtual Chassis stacks of up to 10 switches. Using QSFP+ DAC or fiber cables as Virtual Chassis links, up to 10 EX4300-48T switches can be unified as a single logical device with one management plane, providing up to 480 GbE access ports per stack.

Can the EX4300-48T QSFP+ ports be used as 40GbE uplinks instead of stacking?

Yes — QSFP+ ports on the EX4300-48T can be configured either as Virtual Chassis stacking links or as standard 40GbE uplink ports to a distribution switch. The ports are flexible and can be assigned based on your deployment”s uplink vs. stacking requirements.

Does the EX4300-48T support BGP routing?

Yes — the EX4300 supports BGP alongside OSPFv2/v3, IS-IS, and RIP for full L3 routing capability. This makes it suitable for more complex routing topologies at the campus access layer compared to the EX2300 series, which does not support BGP.

The Juniper EX4300-48T delivers 48-port GbE access connectivity with 40G QSFP+ uplinks, 10-switch Virtual Chassis scalability, and full Junos OS L3 routing — providing the enterprise campus access layer platform that requires BGP, large Virtual Chassis stacks, and 40G uplink capacity in a standard 1U form factor.