Juniper QFX5100‑48SAggregation / Edge Routers (PTX)

High‑Density 10 GbE Access with Scalable 40 GbE Uplinks — Enterprise‑Class Juniper QFX5100‑48S.

The Juniper QFX5100‑48S is a powerful managed data center Ethernet switch built for high‑bandwidth environments. Featuring 48× native 10 GbE SFP+/SFP ports plus 6× 40 GbE QSFP+ uplinks, it delivers ultra‑fast connectivity with 1.44 Tbps wire‑speed and 1.08 Bpps forwarding capacity. Powered by Juniper Junos OS, it supports advanced Layer 2/Layer 3 protocols, low‑latency cut‑through performance, and rich automation capabilities including zero‑touch provisioning and scripting. Designed for top‑of‑rack (ToR) leaf deployments, spine‑leaf fabrics, and scalable Virtual Chassis configurations, the QFX5100‑48S provides versatility, performance, and future‑ready scalability in modern data centers.Key Features

Ports & Connectivity

• 48 × 10 GbE SFP+/SFP ports — native 10 GbE access connectivity.

• 6 × 40 GbE QSFP+ ports — high‑speed uplinks, aggregation, or fabric interconnect.

• Breakout Support: Each 40 GbE QSFP+ port can be breakout‑configured into 4 × 10 GbE ports, allowing support for up to 72× 10 GbE interfaces with breakout cables.

• Management Interfaces: Dedicated RJ‑45 and SFP management ports plus console and USB.

Performance & Capacity

• Switching Capacity: 1.44 Tbps of wire‑speed forwarding.

• Forwarding Rate: 1.08 Bpps (billion packets per second).

• MAC Address Table: ~288,000 entries for large L2 domains.

• Jumbo Frame Support: Up to 9,216 bytes.

• CPU & Memory: Intel dual‑core 1.5 GHz CPU with 8 GB RAM and 32 GB SSD — robust control‑plane performance.

Layer 2 / Layer 3 Capabilities

• Supports comprehensive Layer 2 switching including VLANs, STP/RSTP/MSTP, link aggregation (LACP), QoS, ACLs and IPv6.

• Offers Layer 3 routing protocols such as OSPF, RIP, PIM‑SM, VRRP, ECMP, and static routing for multi‑tier data center fabrics.

• Compatible with VXLAN/EVPN and advanced data center overlay protocols on Junos OS (feature support depends on Junos version).

Advanced Features

• Virtual Chassis / Virtual Chassis Fabric: Enables up to 20 switches to operate as a single logical unit for simplified scalable deployment.

• Automation & Orchestration: Supports zero‑touch provisioning (ZTP), Python scripting, and integration with orchestration tools such as Ansible, Chef, and Puppet.

• Low Latency & Cut‑Through Switching: Suitable for modern data center spine‑leaf and top‑of‑rack (ToR) deployments with deterministic performance.

• Data Center Fabric Integrations: Works with Juniper Apstra for intent‑based networking and advanced fabric telemetry/assurance.

Hardware & Design

• Form Factor: 1 RU rack‑mount switch.

• Dimensions: ~17.36 × 1.72 × 20.48 in (44.09 × 4.37 × 52.02 cm).

• Weight: ~21.8 lb (9.9 kg).

• Power Consumption: ~150 W depending on configuration.

• Airflow: Available in front‑to‑back or back‑to‑front airflow options to match data center cooling requirements.

• Redundancy: Redundant hot‑swappable fans and power supplies available (model/region dependent).

Typical Use Cases

• Data center leaf/spine fabric, especially in 10 GbE/40 GbE topologies.

• Top‑of‑Rack (ToR) aggregation for 10 GbE server connectivity.

• Virtualized and multi‑tenant environments requiring scalable overlays (VXLAN/EVPN).

• High‑density access with breakout flexibility to support 10 GbE at large port counts.