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arista 7280R 7280CR3-32D4

CurrentNetwork2U fixed switch

The Arista 7280CR3-32D4 is a 2U high-density 400GbE deep-buffer spine router and switch powered by dual Jericho 2 silicon. Delivering 32 ports of 400GbE QSFP-DD and 4 ports of 100GbE QSFP28 with a total switching bandwidth of 25.6 Tbps, the 7280CR3-32D4 provides carrier-grade routing scale, deep buffering, and line-rate encryption for next-generation AI and cloud networks.

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Specifications

Brand	arista
Family	7280R
Form factor	2U fixed switch
Released	Jun 2020
Ports	32x 400G QSFP-DD and 4x 100G QSFP28 ports
Switching capacity	25.6 Tbps / 10.6 Bpps
Buffer	HBM deep packet buffer pool with Virtual Output Queueing
Security	Line-rate MACsec-256 on all 400G and 100G ports
Form factor	2U rack mount

Generations

Previous generation: arista 7280R 7280CR3-32P4

Works together

How the arista 7280R 7280CR3-32D4 connects to servers, storage and the network: 4 ways, with the parts and products on each path.

iSCSI and NVMe/TCP over Ethernet File storage (NFS and SMB)Hyperconverged cluster GPU cluster fabric

iSCSI and NVMe/TCP over Ethernet

Server10/25/100GbE NICEthernet switchstorage VLAN, two switchesStorage arrayiSCSI or NVMe/TCP ports

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

HPE ProLiant DL325 Gen10 Plus 1U rack
HPE ProLiant DL385 Gen10 Plus 2U rack
HPE ProLiant MicroServer Gen10 Plus desktop
HPE Edgeline EL8000 5U ruggedized edge system
HPE ProLiant DL325 Gen10 Plus v2 1U rack
HPE ProLiant DL345 Gen10 Plus 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

Storage

Optics

QSFP-100G-SR4 Arista 100GBASE-SR4 QSFP28 Optical Transceiver
QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
407-BBOY Dell 100GbE QSFP28 SR4 Optical Transceiver (850nm, 100m MPO-12)

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

File storage (NFS and SMB)

Server or clientEthernet NICEthernet switchdata or storage VLANNAS or scale-outNFS, SMB, S3 ports

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

HPE ProLiant DL325 Gen10 Plus 1U rack
HPE ProLiant DL385 Gen10 Plus 2U rack
HPE ProLiant MicroServer Gen10 Plus desktop
HPE Edgeline EL8000 5U ruggedized edge system
HPE ProLiant DL325 Gen10 Plus v2 1U rack
HPE ProLiant DL345 Gen10 Plus 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

Storage

Optics

QSFP-100G-SR4 Arista 100GBASE-SR4 QSFP28 Optical Transceiver
QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
407-BBOY Dell 100GbE QSFP28 SR4 Optical Transceiver (850nm, 100m MPO-12)

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

Hyperconverged cluster

HCI nodedrives plus 25GbETwo Ethernet switchesstorage and VM trafficMore HCI nodesthree or more

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

HCI nodes

HPE SimpliVity 380 Gen10 G 2U rack
HPE SimpliVity 325 Gen10 Plus v2 1U 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

Optics

QSFP-100G-SR4 Arista 100GBASE-SR4 QSFP28 Optical Transceiver
QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
407-BBOY Dell 100GbE QSFP28 SR4 Optical Transceiver (850nm, 100m MPO-12)

Hyperconverged cluster: how it fits together

GPU cluster fabric

GPU serverone 200/400G NIC per GPUInfiniBand or RoCE switchrail-optimisedStorage and other GPU serversseparate storage network

InfiniBand adapters and switches must match the generation: HDR is 200Gb, NDR is 400Gb. VPI adapters such as ConnectX-6 and ConnectX-7 can run either InfiniBand or Ethernet.

Servers

GPUs

NVIDIA Data Center GPU A100 SXM4 80GB SXM4 module
NVIDIA Data Center GPU A40 PCIe 4.0 dual-slot full-height full-length
AMD Instinct MI250X OAM (OCP Accelerator Module)
NVIDIA Data Center GPU A10 PCIe single-slot full-height full-length

Adapters for the server

540-BCVE Dell NVIDIA Mellanox ConnectX-6 VPI Single Port 200Gb/s HDR InfiniBand / 200GbE PCIe Adapter
540-BDDW Dell NVIDIA Mellanox ConnectX-6 VPI Dual Port 200Gb/s HDR InfiniBand / 200GbE PCIe Adapter
540-BDRV Dell NVIDIA Mellanox ConnectX-7 Dual Port 400Gb/s NDR InfiniBand / 400GbE PCIe Gen5 Adapter
MCX556A-ECAT NVIDIA ConnectX-5 VPI Dual-Port 100Gb/s EDR InfiniBand and 100GbE QSFP28 PCIe 3.0 x16 Adapter

GPU cluster fabric: how it fits together

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 7280R 7280CR3-32D4.

Compatibility Arista transceivers and cables
Support Arista Support

Equivalent models from other brands

FAQ

How does the 7280CR3-32D4 differ from the 7060DX4-32?

The 7280CR3 is built on Jericho 2 with deep HBM buffers and carrier routing features, while the 7060DX4 is built on Tomahawk 3 for ultra-low latency standard buffering.

Can the 400G ports break out to 100G?

Yes, each 400G port can break out to 4x 100G connections, supporting up to 132 100G ports in 2U.

Buying or selling 7280CR3-32D4?

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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Sources

Arista 7280CR3-32D4 Product Overview, checked 2026-10-27
Arista 7280CR3-32D4 Data Sheet and Specifications, checked 2026-10-27