4 Tbps. 550ns. Cloud-Ready Data Centre Leaf.
The Juniper EX4650-48Y is a compact 1U 25GbE data centre and campus distribution switch delivering 48 ports of 1/10/25GbE plus 8 ports of 40/100GbE in 4 Tbps of non-blocking capacity with 550-nanosecond latency — running full Junos OS with EVPN-VXLAN, MPLS, and BGP.
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EX4650 delivers 4 Tbps of non-blocking Layer 2 and Layer 3 switching capacity in a 1U form factor — sufficient for full line-rate forwarding across all 48 × 25GbE ports and all 8 × 100GbE uplink ports simultaneously. Critical for storage fabric, HPC interconnect, and East-West data centre traffic patterns.
The EX4650 achieves 550-nanosecond hardware latency — essential for financial trading systems, real-time analytics, distributed storage protocols (NVMe-oF, iSCSI), and AI/ML training fabric where inter-GPU communication latency directly impacts job completion time.
EX4650 is a purpose-built EVPN-VXLAN leaf switch, supporting BGP EVPN control plane with VXLAN data plane for scalable multi-tenant overlay networks. Deploy as a leaf in leaf-spine data centre fabrics alongside QFX or EX4650 spine switches, with seamless VM and container workload mobility.
Beyond standard L2/L3, EX4650 supports MPLS with RSVP-TE and LDP, L3 VPN, IPv6 6PE, and BGP add-path — bringing service-provider-grade routing capabilities to the campus distribution and data-centre leaf layer. Enables seamless integration with MPLS WAN services and PE routers.
Each of the 8 QSFP28 100GbE ports supports 4 × 25GbE breakout using standard QSFP28-to-4xSFP28 cables — expanding total 25GbE port count to 80 per switch. This density makes EX4650 cost-effective for server-facing deployments in dense compute or storage clusters.
EX4650 runs a 2.3 GHz quad-core Intel CPU with 16 GB DRAM and 64 GB SSD — providing the compute resources for on-box Python scripting, NETCONF/YANG configuration automation, gRPC-based streaming telemetry, and event-driven automation through Junos event scripts.
The Juniper EX4650 is a 1U 25GbE data centre and campus distribution switch designed for organisations building leaf-spine data centre fabrics, campus core/distribution layers, and high-performance storage and compute interconnects. The flagship EX4650-48Y model delivers 48 × 25GbE SFP28 ports and 8 × 40/100GbE QSFP28 uplinks in 4 Tbps of non-blocking capacity — with 550-nanosecond latency making it suitable for the most latency-sensitive workloads.
EVPN-VXLAN fabric support positions the EX4650 as the natural leaf node in Juniper's IP Fabric architecture — pairing with QFX spine switches or EX9200 chassis for larger deployments. Beyond EVPN-VXLAN, the EX4650 supports a comprehensive routing feature set including MPLS with RSVP-TE and LDP, L3 VPN, IPv6 6PE, and BGP add-path — features that position it for campus distribution roles where service provider-grade routing integration is required alongside data centre switching functionality.
The on-board 2.3 GHz quad-core Intel processor with 16 GB DRAM and 64 GB SSD gives EX4650 the computing resources for on-box automation, streaming telemetry, and advanced analytics — capabilities that higher-port-density but lower-CPU fixed-configuration switches cannot provide. Combined with native Juniper Mist Wired Assurance integration, zero-touch provisioning, and Python/Ansible/Terraform automation support, the EX4650 is fully suited to infrastructure-as-code and GitOps-driven operations.
EX4650 serves as the leaf layer in Juniper IP Fabric deployments — providing 25GbE server connectivity and 100GbE uplinks to spine switches, with BGP EVPN-VXLAN for multi-tenant overlay and sub-millisecond East-West latency.
550ns latency and 25GbE density make EX4650 ideal for NVMe over Fabrics storage interconnects — where storage protocol RTT directly impacts IOPS and throughput achievable from all-flash arrays over Ethernet.
High GPU cluster bandwidth demands require low-latency, high-bandwidth switching fabric. EX4650 provides 25GbE server-side connectivity and 100GbE uplinks for GPU-to-GPU communication across a leaf-spine fabric at the speeds required by distributed AI training jobs.
MPLS, L3VPN, and 100GbE uplinks position EX4650 as a campus distribution or core layer switch — aggregating access-layer EX4400 and EX2300 switches and providing high-speed uplinks to WAN edge routers or internet transit.
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