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FlexFabric module improved network consolidation significantly.
571956-B21
HP BLc VC FlexFabric 10Gb/24-port Opt
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571956-B21
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- HP BLc VC FlexFabric 10Gb/24-port Opt
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571956-B21 Overview
571956-B21 is a high-performance enterprise switch engineered with a robust modular architecture that supports seamless stacking and scalable network designs. It integrates multiple flexible power options, diverse port configurations, and advanced performance features to ensure reliable connectivity and efficient data flow.
This device is optimized for demanding use cases in data centers, campus networks, and critical business applications. Its design offers superior throughput, efficient power distribution, and advanced management capabilities that deliver unparalleled network performance and rapid deployment.
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571956-B21 Specifications
- Product Type
- Switch
- Power Source
- AC Power Supply
- Layer Supported
- Layer 2 / Layer 3
- Form Factor
- Rack-mount
- Power Consumption
- N/A
- Number of Ethernet Ports
- 24–48 Ports
- Number of Downlink Ports
- 24 Ports
- Manageable
- Managed
- Ethernet Technology
- 10/100/1000
- Media Type Supported
- Combo
- Redundant Power Supply Supported
- Yes
- Manufacturer Part Number
- 571956-B21
- Uplink Configuration
- 10G
- IOS
- IP Services
- POE Support
- POE+
- SFP Ports
- 4 SFP Ports
- Memory
- 256 MB
- Rack Units
- 1 RU
- Interface Ports
- 10/100/1000
- Port/Expansion Slot Details
- 2 expansion slots available
- Flash Memory
- 64 MB
- Switching Capacity
- 128 Gbps
- Switching Capacity with Stacking
- 256 Gbps
- Product Name
- Enterprise Modular Switch 571956-B21
- Height
- 1.75 inches
- Width
- 17.5 inches
- Depth
- 15.5 inches
- Weight
- 16 lbs
571956-B21 Use Case
Scalable Virtualized Data Center Networking with HP FlexFabric 10Gb/24-Port Adapter
In large-scale enterprise data centers leveraging HPE BladeSystem c-Class servers, the 571956-B21 HP BLc VC FlexFabric 10Gb/24-port Adapter converges LAN, SAN and inter-VM traffic over a single 10GbE fabric. By offloading NIC and iSCSI functions into hardware and providing per-VM QoS, it supports over 20 virtual machines per port, reduces switch count by 50%, and delivers consistent sub-microsecond latency. The result is simplified management, accelerated VM provisioning, and a 30% reduction in total cost of ownership.
High-Performance Converged Infrastructure for Private Cloud Services
A managed services provider can deploy the 571956-B21 adapter in HPE c-Class blades to offer multi-tenant private cloud environments with strict bandwidth guarantees. FlexFabric’s hardware-based network partitions (NPAR) isolate tenant traffic into up to 24 logical interfaces, ensuring SLA-driven throughput and zero noisy-neighbor impact. The outcome is rapid on-boarding, automated bandwidth scaling, and a 40% increase in rack density while maintaining enterprise-grade security and performance.
Ultra-Low-Latency Financial Trading and Real-Time Analytics
In high-frequency trading firms and real-time analytics platforms, the 571956-B21 HP BLc VC FlexFabric adapter delivers deterministic sub-microsecond latency through RDMA over Converged Ethernet (RoCE) offloads. Integrated in HPE BladeSystem, it sustains line-rate 10Gb throughput across 24 ports, enabling direct-attach connectivity to FPGA-based trading engines and in-memory databases. Traders benefit from 20% faster order execution and 99.999% network availability, driving competitive advantage in millisecond markets.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 571956-B21 |  BK780B |  C8R42A |  834977-B22 |  Q9E63A | |
|---|---|---|---|---|---|
| Depth | 15.5 inches | 11 inches | 11 inches | 12 inches | 14 inches |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Flash Memory | 64 MB | 256 MB | 64 MB | 64 MB | 64 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.75 inches | 1.75 inches | 1 inch | 1.75 inches | 1.75 inches |
| IOS | IP Services | IP Services | IP Services | IP Services | IP Services |
| Interface Ports | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Layer Supported | Layer 2 / Layer 3 | Layer 3 | Layer 2 | Layer 2 / Layer 3 | Layer 2 / Layer 3 |
| Manageable | Managed | Managed | Managed | Managed | Managed |
| Manufacturer Part Number | 571956-B21 | BK780B | C8R42A | 834977-B22 | Q9E63A |
| Media Type Supported | Combo | Combo | Combo | Combo | Combo |
| Memory | 256 MB | 512 MB | 256 MB | 256 MB | 256 MB |
| Number of Downlink Ports | 24 Ports | 24 Ports | 24 Ports | 24 Ports | 24 Ports |
| Number of Ethernet Ports | 24–48 Ports | 24–48 Ports | 24–48 Ports | 24–48 Ports | 24–48 Ports |
| POE Support | POE+ | POE+ | POE+ | POE+ | POE+ |
| Port/Expansion Slot Details | 2 expansion slots available | 24x 10/100/1000 PoE+ ports, 4x SFP uplink ports | 24 Ethernet ports with 4 SFP uplink slots | 24 Ethernet ports with 4 SFP uplink slots | 24 Ethernet ports with 4 dedicated SFP uplinks |
| Power Consumption | N/A | 120W | 35 W | 75 W | 250 W |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | Redundant Power Supply / AC Power Supply | Redundant Power Supply / AC Power Supply |
| Product Name | Enterprise Modular Switch 571956-B21 | BK780B Managed PoE Switch | C8R42A Advanced Managed Switch | 834977-B22 Stackable Gigabit Ethernet Switch | Enterprise Stackable Gigabit Switch Q9E63A |
| Product Type | Switch | Switch | Switch | Switch | Switch |
| Rack Units | 1 RU | 1 RU | 1 RU | 1 RU | 1 RU |
| Redundant Power Supply Supported | Yes | No | Yes | Yes | Yes |
| SFP Ports | 4 SFP Ports | 4 SFP Ports | 4 SFP Ports | 4 SFP Ports | 4 SFP Ports |
| Switching Capacity | 128 Gbps | 320 Gbps | 256 Gbps | 128 Gbps | 128 Gbps |
| Switching Capacity with Stacking | 256 Gbps | 640 Gbps | 512 Gbps | 256 Gbps | 256 Gbps |
| Uplink Configuration | 10G | 10G | 10G | 10G | 10G |
| Weight | 16 lbs | 15 lbs | 12 lbs | 15 lbs | 15 lbs |
| Width | 17.5 inches | 17.2 inches | 17.6 inches | 17.5 inches | 17.5 inches |
Reviews & Ratings
H
Henry Whitaker
4
Stable 10Gb connectivity across blade servers.
V
Victor Rowland
5
Easy integration into our BladeSystem chassis.
S
Stephen Connolly
3
Reduced cabling complexity and improved performance.
P
Paul Henley
4
Consistent operation with no packet loss.
Questions & Answers
What is the HP BLc VC FlexFabric 10Gb/24-port Opt (SKU 571956-B21)?
The HP BLc VC FlexFabric 10Gb/24-port Opt (571956-B21) is a Virtual Connect module for HP c-Class BladeSystem enclosures offering 24 x 10 Gb FlexFabric ports that consolidate LAN and SAN I/O into a single converged fabric.
Which HP BladeSystem enclosures support the 571956-B21 FlexFabric module?
The 571956-B21 is fully compatible with HP c3000 and c7000 BladeSystem enclosures supporting Virtual Connect Gen8 or later firmware.
How many FlexNICs and FlexHBAs does this FlexFabric module provide per server?
Each server bay connected to the 571956-B21 can present up to eight FlexNICs or FlexHBAs, enabling up to eight Ethernet or FCoE paths per mezzanine connector.
Does the FlexFabric module support Converged Network Adapters (CNAs) and FCoE?
Yes. The module supports Converged Network Adapters and Fibre Channel over Ethernet (FCoE), allowing simultaneous LAN, SAN, and iSCSI traffic over a unified 10 GbE infrastructure.