QSFP-100G-SR4: Arista 100GBASE-SR4 QSFP28 Optical Transceiver
Also listed as: QSFP-100G-SR4-AR
The Arista QSFP-100G-SR4 is a 100 Gigabit Ethernet QSFP28 optical transceiver for high-speed switch-to-switch uplinks and spine fabrics.
Specifications
| Part number | QSFP-100G-SR4 |
|---|---|
| Brand | Arista |
| Type | Transceivers |
| Other numbers | QSFP-100G-SR4-AR |
| Status | current |
| Form factor | QSFP28 |
| Speed | 100GbE |
| Wavelength nm | 850 |
| Connector | MPO-12 |
| Cable type | Multimode Fibre |
| Max distance m | 100 |
About the QSFP-100G-SR4
The Arista QSFP-100G-SR4 is a 100GBASE-SR4 QSFP28 optical module designed for short-reach data center interconnects and spine-leaf fabric links. It transmits over 850nm multimode fibre ribbons up to 100 meters on OM4 cabling using an MPO-12 connector. It provides high aggregation bandwidth for modern virtualized computing environments and cloud storage fabrics.
Compatibility
Compatible with Arista QSFP28 ports on 7050X3 and 7060X series switches, including 7050CX3-32S and 7060CX-32S models. It supports standard 100GbE aggregation modes and can also be divided into 4 independent 25GbE channels using optical breakout cabling in Arista Extensible Operating System (EOS).
How to identify a genuine unit
Encased in a precision QSFP28 housing with an integrated beige pull-release tab. The label features Arista branding, part code QSFP-100G-SR4, and manufacturing traceability markings. Arista EOS reports lane-by-lane signal power and operating status via standard CLI monitoring commands.
Buying used
Inspect the MPO-12 multi-fibre connector face for dust or alignment pin deformation before connecting ribbon cables. Insert the transceiver into a switch port to ensure that all 4 25Gbps optical channels achieve frame alignment and link synchronization without packet loss.
Fits these models
Works together
How the Arista QSFP-100G-SR4 connects to servers, storage and the network: 3 ways, with the hardware on each path.
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.
Adapters for the server
BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
540-BDBX Dell NVIDIA Mellanox ConnectX-6 Dx Dual Port 100GbE QSFP56 PCIe Adapter
540-BDCF Dell Intel E810-CQDA2 Dual Port 100GbE QSFP28 PCIe Gen4 Adapter
540-BDCP Dell Broadcom 57508 Dual Port 100GbE QSFP56 PCIe Gen4 Adapter
Switches
arista 7050X 7050CX3-32S 1U fixed switch
arista 7050X 7050SX3-48YC8 1U fixed switch
arista 7050X 7050TX3-48C8 1U fixed switch
arista 7060X 7060CX2-32S 1U fixed switch
Storage
Dell PowerStore 1200T 2U rack
Dell PowerStore 3200T 2U rack
Dell PowerStore 5200T 2U rack
Dell PowerStore 9200T 2U rack
HPE Alletra Storage MP 2U rack
Lenovo ThinkSystem DE6400H 2U rack
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.
Adapters for the server
- BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
- 540-BDBX Dell NVIDIA Mellanox ConnectX-6 Dx Dual Port 100GbE QSFP56 PCIe Adapter
- 540-BDCF Dell Intel E810-CQDA2 Dual Port 100GbE QSFP28 PCIe Gen4 Adapter
- 540-BDCP Dell Broadcom 57508 Dual Port 100GbE QSFP56 PCIe Gen4 Adapter
Switches
- arista 7050X 7050CX3-32S 1U fixed switch
- arista 7050X 7050SX3-48YC8 1U fixed switch
- arista 7050X 7050TX3-48C8 1U fixed switch
- arista 7060X 7060CX2-32S 1U fixed switch
Storage
Dell PowerScale F600 1U rack
Dell PowerScale F900 2U rack
Dell PowerScale H700 4U- Dell PowerStore 1200T 2U rack
- Dell PowerStore 3200T 2U rack
- Dell PowerStore 5200T 2U rack
Hyperconverged cluster
Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.
HCI nodes
HPE SimpliVity 325 Gen10 Plus v2 1U rack
HPE SimpliVity 380 Gen10 G 2U rack
HPE SimpliVity 325 Gen10 1U rack
HPE SimpliVity 380 Gen10 2U rack
Adapters for the server
- BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
- 540-BDBX Dell NVIDIA Mellanox ConnectX-6 Dx Dual Port 100GbE QSFP56 PCIe Adapter
- 540-BDCF Dell Intel E810-CQDA2 Dual Port 100GbE QSFP28 PCIe Gen4 Adapter
- 540-BDCP Dell Broadcom 57508 Dual Port 100GbE QSFP56 PCIe Gen4 Adapter
Switches
- arista 7050X 7050CX3-32S 1U fixed switch
- arista 7050X 7050SX3-48YC8 1U fixed switch
- arista 7050X 7050TX3-48C8 1U fixed switch
- arista 7060X 7060CX2-32S 1U fixed switch
Plan and size it
- Draw this setup in the topology planner mrplanb.com
- Add up rack power and space rack-density.com
- iSCSI explained mrplanb.com
- Virtualization storage Ledger: scored storage platforms mrplanb.com
- Network monitoring tools compared mrplanb.com
Check compatibility with Arista
Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Arista has tested with the Arista QSFP-100G-SR4.
- Compatibility Arista transceivers and cables
- Support Arista Support
FAQ
What connector is used on the Arista 100G-SR4?
It uses an MPO-12 multimode optical connector.
Does it support 4x25GbE breakout mode?
Yes, Arista EOS allows configuring the 100G port into 4 individual 25GbE channels.
Buying or selling QSFP-100G-SR4?
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.
Sources
- Arista Transceivers and Cables Data Sheet, checked 2026-10-27