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HPE P21109-B21 network adapter with two SFP28 ports

HPE

HPE P21109-B21 network card 10/25Gb 2-port SFP28

SKU CH-FWN9-S1BWB MPN P21109-B21

A dual-port SFP28 adapter delivering 10 or 25 Gb Ethernet connectivity for compatible servers

  • Dual-port design enables 10/25Gb connectivity with SFP28 transceivers
  • HPE Gen10 Plus compatibility ensures integration with supported servers
  • I/O offloads including RDMA reduce CPU utilisation for demanding workloads
  • 2522-25G-PLUS adapter delivers scalable bandwidth for hybrid cloud and streaming
  • Engineered for latency-sensitive applications with improved network performance

Network card for HPE Gen10 Plus servers

This HPE P21109-B21 adapter adds two 10/25Gb Ethernet ports to compatible HPE Gen10 Plus servers. It targets data-centre operators who need scalable bandwidth for hybrid cloud services, mobile data workloads and streaming video applications.

Dual SFP28 ports at 10/25Gb

The card provides two SFP28 cages that negotiate at either 10Gb or 25Gb per port. That speed and connector combination is the single specification that determines whether the adapter matches your switch and transceiver infrastructure.

PCIe installation with HPE ecosystem

The adapter installs into a standard PCIe slot on supported HPE Gen10 Plus servers. Buyers who need transceivers or cables not qualified for the HPE ecosystem may encounter link negotiation failures or unsupported-configuration alerts.

Highlights

  • Dual-port design enables 10/25Gb connectivity with SFP28 transceivers
  • HPE Gen10 Plus compatibility ensures integration with supported servers
  • I/O offloads including RDMA reduce CPU utilisation for demanding workloads
  • 2522-25G-PLUS adapter delivers scalable bandwidth for hybrid cloud and streaming
  • Engineered for latency-sensitive applications with improved network performance

Specifications

BrandHPE
Shipping weight0.28 kg
Package size251 × 221 × 66 mm

Questions about this item

What does the 10/25Gb rating mean for actual throughput in a server?

The adapter supports 10 Gb and 25 Gb Ethernet links; real-world throughput depends on the switch port speed, SFP28 module, cable quality and the workload running on the server.

How does the SFP28 interface limit the connection?

SFP28 ports accept 25 Gb transceivers or direct-attach cables; the link will negotiate to 10 Gb or 25 Gb based on the module and partner port capabilities.

What slot and bracket does the P21109-B21 need to fit in a chassis?

The card uses a standard PCI Express x8 edge connector and ships with a low-profile bracket for 1U or full-height servers.

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