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QFX5120-48Y-AFO2, Juniper Networks QFX Series QFX5120-48Y – Switch – L3 – managed – 48 x 1/10/25 Gigabit SFP28 + 8 x 40/100 Gigabit QSFP28 – front to back airflow – rack-mountable


QFX5120-48Y-AFO2 Overview

The QFX5120 Switch delivers rich, low latency Layer 2/Layer 3 features and advanced EVPN-VXLAN capabilities, making it an ideal data center top-of-rack and distribution switch for campus enterprise deployments.

Featuring L3 gateway capabilities for routing between virtualized and bare-metal servers, the QFX5120 is designed for extremely agile data centers that require support for overlay/underlay network architectures. Native 25GbE with 100GbE uplink ports on the QFX5120-48Y and QFX5120-48YM, 10GbE/1GbE copper with 100GbE uplink ports on the QFX5120-48T, and 32 100GbE ports on the QFX5120-32C make the QFX5120 family ideal for spine-and-leaf network deployments.

The Juniper Networks QFX5120 Switch delivers high scale, high availability, and high performance for data center and campus deployments. The QFX5120 Switch is a versatile routing and switching platform addressing higher server access speed and campus distribution use cases while offering high-density 1GbE/10GbE/25GbE and 100GbE uplinks for collapsed spine data center or campus distribution deployments.

Dimensions(W x H x D) 1.72 x 17.36 x 20.48 in. (4.37 x 44.09 x 52.02 cm)

Switching Capacity

4 Tbps (bidirectional)/2 Bpps
Switching mode Cut-through and store-and-forward
Max load 272 W
Typical load 247 W


  • 2 management ports: 2 x RJ-45 ports
  • 1GbE SFP: 48
  • 10GbE SFP+: 48/80(with breakout cable)
  • 25GbE SFP: 48/80 (with breakout cable)
  • 40GbE QSFP+: 8 (each QSFP+ port can be configured as a 4 x 10GbE interface or as a 40 Gbps port)
  • 100GbE QSFP28: 8 (each QSFP28 port can be configured as a 4 x 25GbE interface or as a 100 Gbps port)
  • SFP GbE optical and copper module
  • SFP+ 10GbE optical modules
  • SFP+ direct attach copper (DAC) cables: 1/3/5 m twinax copper and 1/3/5/7 m active twinax copper
  • SFP28 DAC cables: 1/3 m twinax copper
  • SFP28 optics: Short reach (SR), long reach (LR)
  • QSFP+ to SFP+: 10GbE direct attach breakout copper (1/3 m twinax copper cable)
Supported transceiver and direct attach cable
  • QSFP+ DAC cables: 1/3 m twinax copper
  • QSFP+ optics: SR4, LX4, ESR4, ER4, LR4
  • QSFP28 optics: SR4, ER4, PSM4, CWDM4, LR4
Number of link aggregation groups (LAGs) 80
Number of ports per LAG 64

Layer 2 Features

  • STP—IEEE 802.1D (802.1D-2004)
  • Rapid Spanning Tree Protocol (RSTP) (IEEE 802.1w); MSTP (IEEE 802.1s)
  • Bridge protocol data unit (BPDU) protect
  • Loop protect
  • Root protect
  • RSTP and VSTP running concurrently
  • VLAN—IEEE 802.1Q VLAN trunking
  • Routed VLAN interface (RVI)
  • Port-based VLAN
  • Private VLAN (PVLAN)
  • VLAN translation
  • Static MAC address assignment for interface
  • Per VLAN MAC learning (limit)
  • MAC learning disable
  • Link Aggregation and Link Aggregation Control Protocol (LACP) (IEEE 802.3ad)
  • MACsec with AES256 (QFX5120-48YM only)
  • Virtual chassis—up to 2 members on QFX5120-48Y, QFX5120-32C and QFX5120-48T

Layer 3 Features (IPv4)

  • Static routing
  • Routing protocols (RIP, OSPF, IS-IS, BGP)
  • Virtual Router Redundancy Protocol (VRRP)
  • Virtual router
  • Dynamic Host Configuration Protocol (DHCP) relay
  • Proxy Address Resolution Protocol (ARP)


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