Juniper EX3400-24T 24-Port Gigabit Layer 3 Switch – 4x 10G SFP+, 2x 40G QSFP+, Redundant Power

Stackable, redundant Juniper access switching with 10G and 40G uplinks.

The Juniper EX3400-24T is a 24-port Gigabit Ethernet switch from the Juniper EX3400 line, with 4 x 1/10GbE SFP+ and 2 x 40GbE QSFP+ uplinks. Running Junos OS, it is built for enterprise access and small aggregation layers. It supports Virtual Chassis stacking, up to 10 switches.

What the EX3400-24T Fixes in Branch and Campus Networks

As more devices connect at the network edge, access switches are expected to deliver power, segmentation and visibility, not only connectivity. Entry-level switches often lack consistent software, centralized management and the uplink capacity needed when dozens of access points and cameras share one closet.

The EX3400-24T runs Junos OS, the same operating system used across Juniper routers and switches, so configuration templates, automation scripts and troubleshooting skills carry over from branch to core. It supports Layer 2 and Layer 3 features including VLANs, 802.1X, QoS, static routing and RIP, with OSPF and advanced features enabled through Juniper licenses.

Its 4 x 1/10GbE SFP+ and 2 x 40GbE QSFP+ uplinks and Virtual Chassis support (up to 10 switches) keep the closet simple to scale: add switches to the same Virtual Chassis and manage them as one device, either from the CLI or from Juniper Mist cloud with AI-driven insights.

High-Throughput Switching Fabric

With 288 Gbps of switching capacity and 214 Mpps of throughput, the EX3400-24T forwards traffic from all 24 ports and its uplinks at wire speed, suitable for busy offices, labs and server-access roles.

Built for Uptime in the Wiring Closet

The EX3400-24T uses dual hot-swappable ac power supplies (jpsu-150-ac-afo) and 2 hot-swappable fan modules, so a failed component can be replaced without taking the switch offline. Graceful Routing Engine switchover and nonstop bridging keep Virtual Chassis stacks stable during failures.

How to Set Up the Juniper EX3400-24T

1. Rack-mount the switch (or place compact models on a desk or wall), connect power, and keep the airflow path clear.
2. Connect the uplink ports to your aggregation or core switch using SFP+/QSFP optics or DAC cables, then patch access devices to the RJ-45 ports.
3. Run the Junos initial setup through the console port, J-Web or EZsetup, or claim the switch in Juniper Mist for zero-touch provisioning.
4. Configure VLANs, 802.1X, QoS and Virtual Chassis, upgrade to the recommended Junos release, and commit the configuration.