United States$5,000,000+
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E
Edward Sullivan
5
Pass through module worked as expected in blade chassis.
406740-B21
HP BLc 1Gb Enet Pass Thru Mod Opt Kit
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406740-B21
- Description:
- HP BLc 1Gb Enet Pass Thru Mod Opt Kit
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406740-B21 Overview
406740-B21 is a high-performance, stackable switch featuring a modular architecture designed to support flexible network deployment options. It offers multiple power options including redundant power supplies and AC power supply configurations, along with a variety of port types and dedicated stacking capabilities that enhance scalability and network performance.
406740-B21 delivers efficient and reliable operation in demanding environments, providing robust performance through advanced switching technology. Its versatile port configurations and high throughput make it ideal for enterprise networks, data centers, and campus environments where scalability and rapid deployment are essential.
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406740-B21 Specifications
- Product Type
- Switch
- 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
- IOS
- LAN Base
- SFP Ports
- 4 SFP Ports
- Memory
- 256 MB
- Rack Units
- 1 RU
- Interface Ports
- 10/100/1000
- Flash Memory
- 64 MB
- Power Source
- Redundant Power Supply / AC Power Supply
- Media Type Supported
- Combo
- Redundant Power Supply Supported
- Yes
- Height
- 1.75 inches
- POE Support
- POE+
- Uplink Configuration
- 10G
- Switching Capacity
- 56 Gbps
- Width
- 19 inches
- Weight
- 15 lbs
- Power Consumption
- 150 W
- Switching Capacity with Stacking
- 112 Gbps
- Depth
- 17 inches
- Port/Expansion Slot Details
- 24 Ethernet ports with 4 dedicated SFP uplink ports
- Manufacturer Part Number
- 406740-B21
- Product Name
- Advanced Stackable Data Center Switch 406740-B21
406740-B21 Use Case
Data Center Modernization with Legacy Network Integration
In a large enterprise migrating from rack servers to HP BladeSystem c-Class, IT architects install the 406740-B21 HP BLc 1Gb Enet Pass Thru Mod Opt Kit to connect eight blade servers directly to existing 1Gb Ethernet switches. By bypassing blade switches, they achieve a 30% reduction in switch hardware costs, simplify cabling by 40%, and cut network deployment time in half—preserving legacy infrastructure while accelerating server rollouts.
High-Availability Cluster Networking for Financial Trading
A financial services firm building ultra-low-latency trading clusters deploys the 406740-B21 HP BLc 1Gb Enet Pass Thru Mod Opt Kit to map each blade NIC to dedicated physical ports for primary and secondary networks. This deterministic pass-through setup delivers 99.999% uptime, millisecond-level failover, and complete network isolation—meeting stringent regulatory requirements and ensuring uninterrupted trade execution.
Secure Multi-Tenant Virtualization for SMB Hosting
A managed service provider hosting multi-tenant workloads on HP BladeSystem enclosures leverages the 406740-B21 HP BLc 1Gb Enet Pass Thru Mod Opt Kit to assign dedicated 1Gb ports per tenant VLAN. This direct pass-through design enforces strict traffic isolation, guarantees bandwidth per customer, and eliminates noisy-neighbor issues—delivering enhanced security, predictable performance SLAs, and faster tenant provisioning.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 406740-B21 |  657787-B21 |  C8R43A |  R0P79A |  641146-B21 | |
|---|---|---|---|---|---|
| Depth | 17 inches | 12 inches | 12 inches | 12 inches | 10 inches |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Flash Memory | 64 MB | 64 MB | 64 MB | 256 MB | 64 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.75 inches | 1.75 inches | 1.75 inches | 1.75 inches | 1.75 inches |
| IOS | LAN Base | LAN Lite | IP Services | IP Services | LAN Base |
| Interface Ports | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Layer Supported | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 2 |
| Manageable | Managed | Managed | Managed | Managed | Managed |
| Manufacturer Part Number | 406740-B21 | 657787-B21 | C8R43A | R0P79A | 641146-B21 |
| Media Type Supported | Combo | Combo | Combo | Twisted Pair / Fiber / Combo | Combo |
| Memory | 256 MB | 256 MB | 256 MB | 512 MB | 256 MB |
| Number of Downlink Ports | 24 Ports | 24 Ports | 24 Ports | 48 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 | 24 Ethernet ports with 4 dedicated SFP uplink ports | 4 expansion slots available for stacking modules | 24 Gigabit Ethernet ports, 4 SFP slots | 2 expansion slots for modular interfaces | 24 Gigabit Ethernet ports, 4 SFP uplink ports |
| Power Consumption | 150 W | 120W | 85W | 150 W | 60 W |
| Power Source | Redundant Power Supply / AC Power Supply | AC Power Supply with Redundant Option | Redundant Power Supply / AC Power Supply | Redundant Power Supply / AC Power Supply | AC Power Supply |
| Product Name | Advanced Stackable Data Center Switch 406740-B21 | 657787-B21 Next-Gen Network Switch | C8R43A High-Performance Rack-Mount Switch | R0P79A High Performance Stackable Switch | Enterprise 24-Port Stackable Gigabit Switch |
| Product Type | Switch | Switch | Switch | Switch | Switch |
| Rack Units | 1 RU | 1 RU | 1 RU | 1 RU | 1 RU |
| Redundant Power Supply Supported | Yes | Yes | Yes | Yes | Yes |
| SFP Ports | 4 SFP Ports | 4 SFP Ports | 4 SFP Ports | 24 SFP Ports | 4 SFP Ports |
| Switching Capacity | 56 Gbps | 128 Gbps | 128 Gbps | 200 Gbps | 128 Gbps |
| Switching Capacity with Stacking | 112 Gbps | 256 Gbps | 256 Gbps | 400 Gbps | 256 Gbps |
| Uplink Configuration | 10G | 10G | 10G | 10G | 10G |
| Weight | 15 lbs | 15 lbs | 15 lbs | 15 lbs | 12 lbs |
| Width | 19 inches | 17.5 inches | 17.5 inches | 17.5 inches | 19 inches |
Reviews & Ratings
G
Gordon Hayes
4
Simple installation and stable Ethernet connectivity.
V
Victor Lambert
5
Good option for basic blade networking.
N
Neil Harrington
3
Consistent performance with minimal configuration.
T
Thomas Baird
4
Dependable pass through networking solution.
Questions & Answers
What is the HP BLc 1Gb Enet Pass Thru Module Option Kit (SKU: 406740-B21)?
The HP BLc 1Gb Enet Pass Thru Module Option Kit (406740-B21) is a rack-mountable, 16-port copper pass-through device that delivers dedicated 1 Gb Ethernet connectivity from HP BladeSystem c-Class server blades to external network switches or routers.
How many Ethernet ports does the 406740-B21 pass-through module provide?
The 406740-B21 module provides 16 RJ-45 1 Gb Ethernet ports, each mapped directly to a corresponding server blade mezzanine slot for dedicated, non-shared connectivity.
Which HP BladeSystem enclosures support the 406740-B21 module?
The 406740-B21 module is compatible with HP BladeSystem c7000 and c3000 enclosures that accept half-height or full-height c-Class interconnect slots.
What is the difference between a pass-through module and an HP Virtual Connect module?
A pass-through module like the 406740-B21 provides direct wire mapping of blade ports to external networks without traffic management, whereas a Virtual Connect module offers unified network abstraction, traffic virtualization, and firmware-based switch functions.