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406740-B21
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- HP BLc 1Gb Enet Pass Thru Mod Opt Kit
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If a hardware issue is confirmed, we’ll repair or replace the unit. Replacement parts carry either original or 3-month coverage.
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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.
What is the price of 406740-B21?
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Explore more options from Switches or explore other Hpe products.
406740-B21 Specifications
| Product Type | Switch |
| Power Source | Redundant Power Supply / AC Power Supply |
| Layer Supported | Layer 2 / Layer 3 |
| Form Factor | Rack-mount |
| Power Consumption | 150 W |
| 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 | 406740-B21 |
| Uplink Configuration | 10G |
| IOS | LAN Base |
| POE Support | POE+ |
| SFP Ports | 4 SFP Ports |
| Memory | 256 MB |
| Rack Units | 1 RU |
| Interface Ports | 10/100/1000 |
| Port/Expansion Slot Details | 24 Ethernet ports with 4 dedicated SFP uplink ports |
| Flash Memory | 64 MB |
| Switching Capacity | 56 Gbps |
| Switching Capacity With Stacking | 112 Gbps |
| Product Name | Advanced Stackable Data Center Switch 406740-B21 |
| Height | 1.75 inches |
| Width | 19 inches |
| Depth | 17 inches |
| Weight | 15 lbs |
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
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|---|---|---|---|---|---|
| Depth | 12 inches | 17 inches | 10 inches | 12 inches | 12 inches |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Flash Memory | 256 MB | 64 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 | 1.75 inches | 1.75 inches | 1.75 inches |
| Interface Ports | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| IOS | IP Services | LAN Base | LAN Base | LAN Lite | IP Services |
| Layer Supported | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 2 | Layer 2 / Layer 3 | Layer 2 / Layer 3 |
| Manageable | Managed | Managed | Managed | Managed | Managed |
| Manufacturer Part Number | R0P79A | 406740-B21 | 641146-B21 | 657787-B21 | C8R43A |
| Media Type Supported | Twisted Pair / Fiber / Combo | Combo | Combo | Combo | Combo |
| Memory | 512 MB | 256 MB | 256 MB | 256 MB | 256 MB |
| Number of Downlink Ports | 48 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 for modular interfaces | 24 Ethernet ports with 4 dedicated SFP uplink ports | 24 Gigabit Ethernet ports, 4 SFP uplink ports | 4 expansion slots available for stacking modules | 24 Gigabit Ethernet Ports, 4 SFP Slots |
| Power Consumption | 150 W | 150 W | 60 W | 120W | 85W |
| Power Source | Redundant Power Supply / AC Power Supply | Redundant Power Supply / AC Power Supply | AC Power Supply | AC Power Supply with Redundant Option | Redundant Power Supply / AC Power Supply |
| Product Name | R0P79A High Performance Stackable Switch | Advanced Stackable Data Center Switch 406740-B21 | Enterprise 24-Port Stackable Gigabit Switch | 657787-B21 Next-Gen Network Switch | C8R43A High-Performance Rack-Mount 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 | 24 SFP Ports | 4 SFP Ports | 4 SFP Ports | 4 SFP Ports | 4 SFP Ports |
| Switching Capacity | 200 Gbps | 56 Gbps | 128 Gbps | 128 Gbps | 128 Gbps |
| Switching Capacity with Stacking | 400 Gbps | 112 Gbps | 256 Gbps | 256 Gbps | 256 Gbps |
| Uplink Configuration | 10G | 10G | 10G | 10G | 10G |
| Weight | 15 lbs | 15 lbs | 12 lbs | 15 lbs | 15 lbs |
| Width | 17.5 inches | 19 inches | 19 inches | 17.5 inches | 17.5 inches |
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Questions & Answers
Q
What is the HP BLc 1Gb Enet Pass Thru Module Option Kit (SKU: 406740-B21)?
A
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.
Q
How many Ethernet ports does the 406740-B21 pass-through module provide?
A
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.
Q
Which HP BladeSystem enclosures support the 406740-B21 module?
A
The 406740-B21 module is compatible with HP BladeSystem c7000 and c3000 enclosures that accept half-height or full-height c-Class interconnect slots.
Q
What is the difference between a pass-through module and an HP Virtual Connect module?
A
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.
Q
Do I need external switches when using the HP BLc pass-through module?
A
Yes. The 406740-B21 module acts as a physical port distributor only. You must connect its 16 external RJ-45 ports to external Ethernet switches or routers to enable network access.
Q
What cable types and lengths are supported with this module?
A
The module supports standard Cat5e or better unshielded twisted-pair (UTP) copper Ethernet cables up to 100 meters per 1 Gb port.
Q
Is the 406740-B21 pass-through module hot-swappable?
A
Yes. The HP BLc pass-through module can be inserted or removed from a powered HP BladeSystem c-Class enclosure without shutting down the servers or the enclosure.
Q
How do I install the HP BLc 1Gb Enet Pass Thru Module?
A
Power off or place the enclosure in service mode, align the module to an available interconnect bay, slide it until it locks, then reconnect external cables. Finally, exit service mode or power up the enclosure.
Q
What network speeds and duplex modes does this module support?
A
Each port on the 406740-B21 pass-through module supports 10/100/1000 Mbps Ethernet with auto-negotiation for full- or half-duplex modes.
Q
Does the pass-through module introduce additional network latency?
A
No. The 406740-B21 operates as a direct copper connection with negligible latency, equivalent to a straight-through cable link.
Q
Can the HP BLc pass-through module be used in redundant network designs?
A
Yes. You can install multiple pass-through modules in separate interconnect bays and connect them to different external switches to achieve network redundancy and failover.
Q
Does the 406740-B21 module support link aggregation (LACP)?
A
Link aggregation must be configured on the external switch. The pass-through module simply transports aggregated links; the switch performs LACP grouping.
Q
Is there built-in management or intelligence in the HP BLc 1Gb pass-through module?
A
No. This module offers no management interface or traffic switching; server blades are managed through HP Onboard Administrator or their operating systems.
Q
What warranty covers the 406740-B21 module?
A
HP provides a one-year limited hardware warranty for the 406740-B21 pass-through module, with optional warranty and support upgrades available.
Q
Can I mix pass-through and Virtual Connect modules in the same enclosure?
A
Yes. HP BladeSystem allows mixed interconnect modules in different bays, but blades must be cabled correctly for the desired network type.
Q
Does the pass-through module draw additional power from the enclosure?
A
The 406740-B21 has a minimal power draw—under 20 watts total—and the precise consumption is managed by the enclosure’s power subsystem.
Q
How do I verify the 406740-B21 module is recognized by my system?
A
Open the HP Onboard Administrator console or iLO system information. The pass-through module will appear under interconnect bays with its model number (406740-B21) and status indicators.
