870825-B21 HPE 631flr-sfp28 Ethernet 10/25GB 2 Port Adapter

HPE 870825-B21 10/25GbE 2-Port Adapter Overview

The HPE 870825-B21 Ethernet Adapter is a high-performance dual-port networking solution designed for enterprise-grade data centers, virtualization environments, and cloud infrastructure. Built to deliver ultra-fast connectivity and advanced offloading capabilities, this adapter enhances server efficiency, reduces latency, and supports modern high-bandwidth workloads.

General Information

• Manufacturer: HPE
• Part Number: 870825-B21
• Device Type: Ethernet Network Adapter

Technical Specifications 

• PCI Express Revision: PCIe 3.0
• Network Interface: FlexibleLOM
• Ports: 2 x SFP28 25Gb Ethernet ports

Performance Optimization Features

Data Acceleration Technologies

• TCP/IP offloading for reduced CPU usage
• UDP/IP offloading for improved packet handling
• LSO (Large Send Offload) and TSO (TCP Segmentation Offload)
• Receive Side Scaling (RSS) for balanced workload distribution

Virtualization and Cloud Networking Support

• VXLAN (Virtual Extensible LAN) support for scalable cloud networking
• NVGRE encapsulation for network virtualization environments
• RoCE v2 (RDMA over Converged Ethernet) for low-latency data transfer

Supported Networking Protocols and Standards

Protocol Compatibility

• IPv4 and IPv6 dual-stack support
• Full duplex mode for simultaneous send/receive operations
• VLAN tagging and segmentation support

Industry Standards Compliance

IEEE Protocol Support

• IEEE 802.1q VLAN tagging
• IEEE 802.1p traffic prioritization
• IEEE 802.3x flow control
• IEEE 802.3ad link aggregation (LACP)
• IEEE 1588v2 time synchronization

Advanced Networking Standards

• IEEE 802.1ab LLDP (Link Layer Discovery Protocol)
• IEEE 802.1qaz Enhanced Transmission Selection
• IEEE 802.1qau congestion notification
• IEEE 802.3ae high-speed Ethernet standards

Processing Advantages

• Reduced CPU overhead through hardware offloading
• Optimized packet processing for low latency
• Enhanced throughput for data-intensive workloads

Compatibility

• Compatible with HPE server platforms supporting FlexibleLOM
• Supports both standard and low-profile brackets
• Easy integration into existing data center infrastructure

Network Diagnostics and Control

• PXE boot support for network-based deployment
• LLDP for topology discovery
• Real-time traffic monitoring capabilities

Data Center Optimization

• High-density virtualization clusters
• Cloud computing infrastructure scaling
• Enterprise storage networking (SAN/NAS)

HPE 870825-B21 Ethernet 10/25Gb 2-Port Adapter

The HPE 870825-B21 Ethernet 10/25Gb 2-Port 631FLR-SFP28 Adapter With Both Brackets represents a high-performance networking solution designed for enterprise data centers requiring scalable, flexible, and ultra-low latency connectivity. Engineered this adapter is optimized for workloads that demand consistent throughput, virtualization efficiency, and high-speed data transfer across mission-critical infrastructure environments.

Built on advanced architecture supporting 10GbE and 25GbE speeds, this adapter is ideal for next-generation cloud computing, virtualization clusters, storage networking, and high-performance computing environments. Its dual-port design ensures redundancy, load balancing, and enhanced network resilience in dense server deployments.

Advanced 631FLR-SFP28 Architecture and Design Philosophy

The 631FLR-SFP28 form factor is designed specifically for HPE ProLiant rack and blade servers, delivering a compact yet powerful networking interface that integrates directly into server systems without consuming traditional PCIe slots. This design improves airflow efficiency and reduces internal cable clutter, which is essential for modern high-density data centers.

The adapter leverages SFP28 transceiver technology, enabling seamless interoperability with both 10GbE SFP+ and 25GbE SFP28 optical modules. This backward compatibility allows organizations to gradually upgrade infrastructure without requiring complete hardware replacement, making it a cost-effective investment for long-term scalability.

Dual-Port High-Speed 

Equipped with two independent ports, the HPE 870825-B21 enables simultaneous network connections that can be configured for redundancy, aggregation, or workload segmentation. This dual-port architecture significantly enhances system availability while ensuring uninterrupted service delivery in enterprise environments where downtime is not acceptable.

Each port operates independently, allowing network administrators to assign separate traffic types such as storage replication, virtual machine traffic, or application-specific workloads. This segmentation helps optimize bandwidth usage and reduces network congestion in demanding environments.

Flexible Speed Support for 10GbE and 25GbE Environments

One of the key advantages of this adapter is its dynamic support for both 10 Gigabit Ethernet and 25 Gigabit Ethernet speeds. This flexibility ensures compatibility with existing infrastructure while providing a clear upgrade path toward higher bandwidth requirements. Organizations can deploy 10GbE today and transition to 25GbE as performance demands increase.

This adaptability is particularly important in hybrid cloud environments, where workloads frequently shift between on-premises and cloud-based systems. The ability to scale bandwidth without replacing hardware significantly reduces operational costs and simplifies infrastructure planning.

Performance Optimization in Data Center Environments

Low Latency and High Throughput Networking

The HPE 870825-B21 adapter is engineered for environments where low latency and high throughput are critical. It minimizes packet processing delays through hardware-based offloading techniques, allowing servers to handle large volumes of network traffic efficiently without overloading CPU resources.

This makes the adapter especially suitable for high-frequency trading platforms, real-time analytics systems, virtualization clusters, and distributed storage networks where even microsecond delays can impact performance outcomes.

Hardware Offloading Capabilities

To enhance system efficiency, the adapter incorporates advanced offloading features such as TCP/IP checksum offload, segmentation offload, and interrupt moderation. These features reduce CPU utilization and free up system resources for application-level processing.

By offloading repetitive networking tasks to dedicated hardware components, the adapter ensures consistent performance even under heavy network loads. This is essential for virtualized environments where multiple virtual machines share the same physical network interface.

Optimized for Virtualization Platforms

The adapter is fully optimized for modern virtualization technologies including hypervisor-based infrastructures. It supports efficient virtual machine traffic distribution, ensuring each virtual instance receives adequate bandwidth without interfering with others.

In cloud data centers, virtualization efficiency directly impacts scalability and cost-effectiveness. The HPE 870825-B21 enhances virtual machine density by providing stable and predictable network performance across multiple workloads running simultaneously on shared hardware resources.

Integration with HPE ProLiant Server Ecosystem

Seamless Compatibility with Enterprise Servers

Designed specifically for integration with the adapter ensures full compatibility with firmware, management tools, and system-level monitoring utilities. This tight integration reduces configuration complexity and ensures optimal performance out of the box.

The 631FLR-SFP28 form factor enables direct installation into compatible server slots, eliminating the need for additional PCIe expansion cards and preserving valuable server expansion capabilities for other critical components.

Efficient System Resource Utilization

By integrating directly into the server architecture, the adapter reduces power consumption and improves airflow management. This contributes to better thermal performance and enhances overall system reliability, especially in densely packed rack environments.

Efficient resource utilization is a core requirement in modern data centers, where energy efficiency and cooling optimization directly affect operational costs. The HPE 870825-B21 is designed with these priorities in mind.

Network Scalability and Enterprise Deployment Scenarios

Cloud Data Centers and Hybrid Infrastructure

The adapter is widely used in cloud data centers where scalability and flexibility are essential. Its dual-speed capability allows organizations to support mixed network environments, transitioning from legacy systems to high-speed infrastructure without disruption.

In hybrid cloud deployments, consistent network performance is critical for synchronizing workloads between on-premises servers and cloud platforms. The adapter ensures stable connectivity and high-speed data transfer across distributed environments.

High-Performance Computing Applications

High-performance computing environments rely heavily on fast interconnects to process complex calculations and large datasets. The HPE 870825-B21 supports these workloads by providing high-bandwidth, low-latency communication between compute nodes.

Scientific research, machine learning model training, and financial modeling systems benefit significantly from the adapter’s ability to handle sustained high-throughput traffic without degradation in performance.

Enterprise Storage Networking

Storage area networks (SAN) and network-attached storage (NAS) systems require consistent and reliable data transfer capabilities. The adapter ensures efficient communication between storage arrays and compute servers, minimizing bottlenecks in data-intensive operations.

Its support for high-speed Ethernet standards makes it suitable for modern software-defined storage architectures, where performance and redundancy are equally important.