BCM56321B1KFSBG

Overview

The BCM56321B1KFSBG is a Broadcom StrataXGS Tomahawk family Layer 3 Ethernet Switch ASIC designed for high-density data center and enterprise core routing applications. It features a switching capacity of 1.28 Tbps with integrated 40 Gbps SerDes interfaces, supporting flexible port configurations including 32 ports of 40GbE or 64 ports of 25GbE. The device utilizes a 28nm process technology and incorporates the FleXGS architecture for high-performance packet processing. Key specifications include support for hardware-accelerated VXLAN/NVGRE tunneling, OpenFlow 1.3+ programmability via OF-DPA, and BroadView telemetry for network observability. The B1 silicon stepping and KFSBG packaging denote specific manufacturing revisions and large-pin-count FBGA form factors suitable for complex PCB layouts.

Feature Summary

• Hardware-accelerated overlay tunneling for cloud network virtualization
• OpenFlow 1.3+ programmability for software-defined networking integration
• BroadView telemetry for real-time flow statistics and congestion detection
• Smart-Buffer and Smart-Hash technologies to optimize latency and load balancing

Applications

• Data center spine and leaf switch architectures
• Enterprise core and aggregation layer routing
• High-density 40G/25G server access switches
• Software-defined data center (SDDC) infrastructure

Procurement Notes

Verify the specific silicon stepping (B1) against your system compatibility matrix, as revisions may impact firmware requirements. Confirm the KFSBG package dimensions and pinout with the official mechanical drawing before PCB layout finalization. Ensure supply chain sources provide authenticity documentation, as this component requires specialized handling and testing procedures during integration.

Selection Notes

Select this model when a 1.28 Tbps throughput meets your bandwidth requirements while maintaining lower power consumption compared to higher-tier Tomahawk generations. Evaluate the 40G/25G SerDes flexibility against your uplink and downlink port density needs. Consider the availability of SDK support for OpenFlow and telemetry features if SDN integration is a primary design goal.

Part Context

This component belongs to the Broadcom StrataXGS Tomahawk series, representing an evolution in high-performance switching silicon. It bridges the gap between entry-level and flagship data center switches, offering a balance of port density and processing capability. The part number suffix indicates the specific package type and environmental compliance status within the broader product line.

Replacement Considerations

Direct pin-to-pin replacements are not typically available across different Tomahawk generations due to architectural changes. Verify backward compatibility with existing board designs if considering upgrades to newer silicon steppings or alternative families within the StrataXGS portfolio.