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P21112-B21: HPE Ethernet 10Gb 4-port BASE-T BCM57416 OCP3 Adapter

HPE P21112-B21 OCP adapterPCIe 3.0 x810GbEOCP 3.0
HPEOCP adaptersPCIe 3.0 x8

Also listed as: P22785-001, P21113-001, BCM957416M4160C, BCM57416-OCP · made by Broadcom

The HPE P21112-B21 is a 4-port 10GBASE-T copper OCP 3.0 mezzanine adapter based on the Broadcom BCM57416 controller. It delivers four 10Gbps RJ-45 copper ports directly through the server OCP 3.0 mezzanine bay, preserving PCIe riser slots for GPUs or storage cards while supporting RoCE v2, VXLAN offloads, and multi-tenant virtualization on ProLiant Gen10 Plus and Gen11 systems. Used buyers should inspect the faceplate latch and test all four ports.

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Specifications

Part numberP21112-B21
BrandHPE
Made byBroadcom
TypeOCP adapters
Other numbersP22785-001, P21113-001, BCM957416M4160C, BCM57416-OCP
Statuscurrent
Speed10GbE
Ports4x RJ-45 10GBASE-T
InterfacePCIe 3.0 x8
Form factorOCP 3.0
ControllerBroadcom BCM57416
Generation fitGen10 Plus / Gen11

About the P21112-B21

The HPE P21112-B21 provides four 10GBASE-T twisted-pair copper connections in a compact Open Compute Project (OCP) 3.0 form factor. Based on Broadcom NetXtreme-E BCM57416 silicon, it connects to standard Cat6/Cat6A structured cabling, offering multi-tenant segmentation, hardware RoCE v2, and stateless offloads. By integrating into the server dedicated OCP 3.0 slot, it eliminates the need for standup PCIe cards in dense virtualization nodes.

Compatibility

Compatible exclusively with HPE ProLiant Gen10 Plus and Gen11 servers equipped with OCP 3.0 mezzanine slots (including DL380 Gen10 Plus/Gen11, DL360 Gen10 Plus/Gen11, and DL385 Gen11). It is physically incompatible with Gen9 or standard Gen10 non-Plus systems that use FlexibleLOM bays. Requires no extra riser cards or internal cabling.

How to identify a genuine unit

Genuine cards feature an HPE serial label displaying Option Part Number P21112-B21, Spare Part Number P22785-001, and Assembly Part Number P21113-001. The PCB is fitted with an OCP 3.0 pull-tab release handle and 4 stacked RJ-45 ports. Under iLO 5 and iLO 6, it enumerates as 'HPE Ethernet 10Gb 4-port BCM57416 OCP3 Adapter'.

Buying used

When evaluating used P21112-B21 OCP cards, inspect the spring-loaded release handle and alignment tabs on the metal casing for physical bending. Check that all 8 copper contacts inside each of the four RJ-45 receptacles are straight and clean. Confirm that the host server boots cleanly and that iLO reports valid link speeds across all connected copper ports.

Reference prices (last 14 days, updated 2026-10-27)

New: USD 495 (1 sighting, Oct 2026)

Refurbished: USD 245 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
serversupply.comnewUSD 495New factory sealed retail kit2026-10-27
globalonetechnology.comrefurbishedUSD 245Refurbished genuine OCP card, all ports tested2026-10-27

Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.

Fits these models

Works together

How the HPE P21112-B21 connects to servers, storage and the network: 3 ways, with the hardware 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.

Switches

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.

Switches

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

Switches

Optics

Hyperconverged cluster: how it fits together

Plan and size it

Check compatibility with HPE

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that HPE has tested with the HPE P21112-B21.

Equivalent part numbers

FAQ

Does P21112-B21 generate high heat in 1U servers like DL360 Gen11?

Yes, 10GBASE-T PHYs consume more power than optical SFP+ cards. The server iLO thermal management automatically regulates fan curves to ensure adequate airflow across the OCP slot.

Can all four ports on P21112-B21 run independently?

Yes, each port functions as an independent 10GbE network interface with its own dedicated MAC address, supporting separate VLANs, teaming, and virtual switches.

Buying or selling P21112-B21?

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