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571956-B21
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HP BLc VC FlexFabric 10Gb/24-port Opt
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Name:
571956-B21
- Description:
- HP BLc VC FlexFabric 10Gb/24-port Opt
- Rating:
Added to cart 28 times recently
- Availability:
2 In stock - Ready to Ship
- Brand:
- Hpe
- Condition:
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
- Warranty:
- 90
- List Price:
$85.00
- Price:
$70.0017.6% off
Quantity:
1
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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.
571956-B21 price is is available on request. Get immediate quote.
Request bulk order quote for 571956-B21 for additional pricing. Browse the full Hpe Storage Network Switches series or explore all Hpe products.
571956-B21 Specifications
- Product Type
- Switch
- Brand
- Hpe
- Power Source
- AC Power Supply
- Layer Supported
- Layer 2 / Layer 3
- Form Factor
- Rack-mount
- 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.
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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 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 |
Compliance & Coverage
100% Genuine Product Guarantee
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
Up to 3-Year Warranty Coverage
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
Hassle-Free RMA & Returns
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Rigorously Tested & Quality Assured
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Expert Technical Support
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Fast Global Delivery
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reviews & Ratings
O
Oliver Stanton
4
FlexFabric module improved network consolidation significantly.
H
Henry Whitaker
4
Stable 10Gb connectivity across blade servers.
V
Victor Rowland
4
Easy integration into our BladeSystem chassis.
S
Stephen Connolly
5
Reduced cabling complexity and improved performance.
P
Paul Henley
5
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.
What external uplink options are available on the 571956-B21?
The module provides eight external QSFP+ uplink ports configurable as four 40 GbE or eight 10 GbE by using standard QSFP+ to SFP+ break‐out cables.
Is a Virtual Connect license required for installation?
No additional license is required. The module is ready for use out of the box with Virtual Connect Manager or Enterprise Manager firmware built into HP c-Class enclosures.
How do I install the HP BLc VC FlexFabric 10Gb/24-port module?
Power off the enclosure, slide the module into an available interconnect bay on the rear of the enclosure, secure the latch, power on, and configure it via the Virtual Connect web interface.
Can I mix FlexFabric modules with other Virtual Connect modules?
Yes. You can mix FlexFabric modules with Virtual Connect Flex-10/10D or Fibre Channel modules in different bays, provided each bay’s port mapping is supported by your enclosure generation.
How do I configure FlexNIC profiles in Virtual Connect Manager?
In Virtual Connect Manager, navigate to the server profile, define FlexNIC and FlexHBA assignments per mezzanine slot, map them to external networks or SAN, then apply and deploy the profile.
What firmware version is recommended for optimal performance?
Use the latest Virtual Connect firmware (Gen8 or higher), available on the HPE Support site. Ensure both enclosure and module firmware match the recommended compatibility matrix.
Does this module support VLAN tagging and QoS?
Yes. It fully supports 802.1Q VLAN tagging, priority-based flow control, and QoS policies to isolate and prioritize traffic for virtualized workloads.
What transceivers are compatible with the 571956-B21 uplinks?
Use HPE 10 Gb SFP+ SR/LR transceivers or QSFP+ SR4/LR4 for 40 GbE uplinks, and ensure they’re HPE-branded or HPE-qualified for guaranteed interoperability.
Can I use this module with VMware vSphere and Microsoft Hyper-V?
Yes. The FlexFabric module is hypervisor-agnostic and fully certified for VMware vSphere, Microsoft Hyper-V, and other major virtualization platforms supporting Converged Network Adapters.
How do I monitor port statistics and health status?
Use the Virtual Connect web GUI or HPE OneView to view real-time port statistics, link status, error counters, and module health.
What is the typical power consumption for the FlexFabric module?
Maximum power consumption is approximately 23 W per module under full load; typical idle consumption is around 10 W, subject to enclosure cooling capacity.
How does FlexFabric differ from HP Flex-10?
FlexFabric extends Flex-10 by adding Fibre Channel over Ethernet and Converged Network Adapter support, whereas Flex-10 only provides up to four FlexNICs per port without FCoE.