arista 7280R 7280SR2K-48C6
The Arista 7280SR2K-48C6 is an enterprise 1U deep-buffer router and switch powered by Jericho+ silicon with an external Knowledge-based Processor (KBP). Providing 48 ports of 10GbE SFP+ and 6 ports of 100GbE QSFP28 backed by a 24GB packet buffer and expanded algorithmic TCAM tables, the 7280SR2K is built for edge peering, telco aggregation, and high-concurrency DCI fabrics.
Specifications
| Brand | arista |
|---|---|
| Family | 7280R |
| Form factor | 1U fixed switch |
| Released | Jun 2017 |
| Ports | 48x 10GbE SFP+ and 6x 40G/100G QSFP28 ports |
| Switching capacity | 2.16 Tbps / 1.5 Bpps |
| Packet buffer | 24GB deep buffer with VOQ architecture |
| Kbp coprocessor | External K-series Knowledge-based Processor for massive route scaling |
| Route scale | Supports up to 2.5 million IPv4/IPv6 routes in hardware |
Generations
- Previous generation: arista 7280R 7280SR-48C6
- Next generation: arista 7280R 7280SR3-48YC8
Works together
How the arista 7280R 7280SR2K-48C6 connects to servers, storage and the network: 3 ways, with the parts and products 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.
Servers
HPE Superdome Flex Superdome Flex 5U chassis, 4 sockets each, up to 8 chassis
HPE Synergy 660 Gen10 Compute Module full-height compute module
Dell PowerEdge R440 1U rack
Dell PowerEdge R540 2U rack
Dell PowerEdge R640 1U rack
Dell PowerEdge R740 2U rack
Adapters for the server
BCM957416A4160C Broadcom NetXtreme-E BCM57416 Dual-Port 10GBASE-T PCIe 3.0 Ethernet Network Adapter
BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
Storage
HPE MSA 2050 2U rack enterprise SAN
Lenovo ThinkSystem DS4200 2U rack
Lenovo ThinkSystem DE2000H 2U rack
Dell PowerVault ME4012 2U rack
Dell PowerVault ME4024 2U rack
Dell Unity XT Unity 300 2U rack
Optics
QSFP-100G-SR4 Arista 100GBASE-SR4 QSFP28 Optical Transceiver
SFP-10G-SR-AR Arista 10GBASE-SR SFP+ Optical Transceiver
QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
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
- HPE Superdome Flex Superdome Flex 5U chassis, 4 sockets each, up to 8 chassis
- HPE Synergy 660 Gen10 Compute Module full-height compute module
- Dell PowerEdge R440 1U rack
- Dell PowerEdge R540 2U rack
- Dell PowerEdge R640 1U rack
- Dell PowerEdge R740 2U rack
Adapters for the server
- BCM957416A4160C Broadcom NetXtreme-E BCM57416 Dual-Port 10GBASE-T PCIe 3.0 Ethernet Network Adapter
- BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
- 540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
- 540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
Storage
- Dell Unity XT Unity 300 2U rack
Dell Unity XT Unity 400 2U rack
Lenovo ThinkSystem DM3000H 2U rack
Lenovo ThinkSystem DM5000H 2U rack
Lenovo ThinkSystem DM7000H 3U rack
Dell Unity XT 380F 2U rack
Optics
- QSFP-100G-SR4 Arista 100GBASE-SR4 QSFP28 Optical Transceiver
- SFP-10G-SR-AR Arista 10GBASE-SR SFP+ Optical Transceiver
- QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
Hyperconverged cluster
Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.
HCI nodes
Dell VxRail P Series P570F 2U rack (1 node)
HPE SimpliVity 380 Gen10 2U rack
HPE SimpliVity 380 Gen9 2U rack
Lenovo ThinkAgile HX3320 1U rack
Adapters for the server
- BCM957416A4160C Broadcom NetXtreme-E BCM57416 Dual-Port 10GBASE-T PCIe 3.0 Ethernet Network Adapter
- BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
- 540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
- 540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
Optics
- QSFP-100G-SR4 Arista 100GBASE-SR4 QSFP28 Optical Transceiver
- SFP-10G-SR-AR Arista 10GBASE-SR SFP+ Optical Transceiver
- QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
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 7280SR2K-48C6.
- Compatibility Arista transceivers and cables
- Support Arista Support
Equivalent models from other brands
FAQ
What does the 'K' designation signify in the 7280SR2K?
The 'K' indicates an integrated Knowledge-based Processor (KBP) that expands hardware route table capacity to millions of routes for carrier edge and peering applications.
Does the 7280SR2K support MACsec encryption?
Selected 7280SR2K models feature line-rate hardware MACsec encryption on uplink and downlink ports.
Buying or selling 7280SR2K-48C6?
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 7280SR2K-48C6 Product Overview, checked 2026-10-27
- Arista 7280SR2K-48C6 Data Sheet and Specifications, checked 2026-10-27