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juniper QFX Series QFX5100-48S

End of saleNetwork1U fixed switch
Juniper juniper QFX Series QFX5100-48S1U fixed switch48 ports1.44 Tbps

The Juniper QFX5100-48S is a 1U top-of-rack datacenter switch delivering 48 ports of 1G/10G SFP/SFP+ and 6 ports of 40G QSFP+. Powered by Broadcom Trident II silicon and Junos OS with Topology-Independent In-Service Software Upgrades (TFX ISSU), the QFX5100-48S was one of the most widely deployed 10G leaf switches in enterprise private clouds. Secondary hardware brokers trade the QFX5100-48S in high volumes as an economical, battle-tested 10G access switch for virtualized compute clusters and storage fabrics.

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Specifications

Brandjuniper
FamilyQFX Series
Form factor1U fixed switch
ReleasedOct 2013
End of saleApr 2020
End of supportApr 2025
Ports48x 10GbE SFP+ and 6x 40GbE QSFP+ ports
Switching capacity1.44 Tbps / 1.08 Bpps wire-speed forwarding performance
LatencySub-microsecond latency (approx. 550 nanoseconds in cut-through mode)
FeaturesVirtual Chassis, Virtual Chassis Fabric (VCF), VXLAN L2 gateway, and Junos ISSU
Power and coolingDual redundant hot-swappable AC or DC power supplies with reversible airflow

Generations

Works together

How the juniper QFX Series QFX5100-48S connects to servers, storage and the network: 3 ways, with the parts and products on each path.

iSCSI and NVMe/TCP over EthernetFile storage (NFS and SMB)Hyperconverged cluster

iSCSI and NVMe/TCP over Ethernet

Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.

Servers

Adapters for the server

Storage

Optics

iSCSI and NVMe/TCP over Ethernet: how it fits together

File storage (NFS and SMB)

Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.

Servers

Adapters for the server

Storage

Optics

File storage (NFS and SMB): how it fits together

Hyperconverged cluster

Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.

HCI nodes

Adapters for the server

Optics

Hyperconverged cluster: how it fits together

Plan and size it

Check compatibility with Juniper

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Juniper has tested with the juniper QFX Series QFX5100-48S.

Equivalent models from other brands

FAQ

Can the 40GbE QSFP+ ports be used as 4x 10GbE breakout ports?

Yes, all six QSFP+ ports support 4x 10GbE breakout cables, providing up to 72 total 10GbE ports.

Does the QFX5100 support hitless software upgrades?

Yes, Junos TFX In-Service Software Upgrade (ISSU) allows software updates without data plane interruption.

Buying or selling QFX5100-48S?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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