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Cisco Silicon One G100 Data Sheet

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Updated:March 11, 2021

Available Languages

Download Options

  • PDF
    (466.6 KB)
    View with Adobe Reader on a variety of devices
Updated:March 11, 2021

Table of Contents



Value statement

The silicon industry has always been plagued with the trichotomy of switching silicon, routing line card silicon, and routing fabric silicon. Using these three basic building blocks, silicon and system vendors created unique architectures tuned for individual markets and industries. Consequentially, forcing customers to consume and manage these disjointed and dissimilar products caused an explosion in complexity, CapEx, and OpEx for the industry.

The Cisco Silicon One architecture ushers in a new era of networking, enabling one silicon architecture to address a broad market space, while simultaneously providing best-of-breed devices.

At 25.6 Tbps, the Cisco Silicon One G100 builds on the groundbreaking technology of the Cisco Silicon One Q200L but brings the efficiency and flexibility of Cisco Silicon One and 7 nm to new levels by enabling 1 Rack Unit (RU) 64x400GE spine and leave switches.

Product overview

The Cisco Silicon One G100 processor is a 25.6-Tbps, full-duplex, standalone switching processor that can be used to build fixed form factor switches ideally targeted for web-scale data center spine and leaf applications.

Form Factors

Figure 1.            

Form Factors

Features and benefits

Table 1.        Architectural characteristics and benefits



Unified architecture across multiple markets

Greatly simplifies customer network infrastructure deployments

Unified SDK across market segments and applications

Provides a consistent point of integration for all applications across the entire network infrastructure

High-performance switching silicon

Achieve line rate at small packet sizes

Power-efficient switching silicon

The power efficiency of 7 nm and the Cisco Silicon One architecture optimized for the high-bandwidth web-scale switching market

Large and fully unified packet buffer

Fully shared on-die packet buffer

Switching efficiency with programmable features

Addresses the requirements of web-scale providers’ switching applications without sacrificing features and programmability

Run-to-completion network processor

Provides feature flexibility without compromising performance or power efficiency

P4 programmable

A programmable processor to allow for rapid feature development

Prominent feature

Flexibility and performance for next-generation web-scale networks

Block Diagram

Figure 2.            

Block Diagram


      256 112G SerDes; each can be configured independently to operate in 10G/25G/50G/100G using NRZ or PAM4 modulation

      Flexible port configuration supporting 10/25/40/50/100/200/400/800/1.6T Gbps

      Large, fully shared, on-die packet buffer

      1588v2 and SyncE support with nanosecond-level accuracy

      On-chip, high-performance, P4-programmable host NPU for high-bandwidth offline packet processing (for example, OAM processing and MAC learning)

      Multiple embedded processors for CPU offloading

Traffic management

      Large pool of configurable queues

      Support for ingress and egress traffic mirroring

      Support for link-level (IEEE802.3x), PFC priority-level (802.1Qbb) flow control and ECN marking

      Support of port extenders


      Run-to-completion, distributed, P4-programmable NPU architecture

      Line rate at very small packets with complex packet processing

      Web-scale optimized and shared NPU fungible tables

      Support of demanding packet processing features without impacting data rate

      Support of simple packet processing features while optimizing power and latency

Load balancing

      Flow load balancing using ECMP or LAG

      Dynamic flowlet load balancing with ability to detect and handle elephant flows

Instrumentation and telemetry

      Programmable meters used for traffic policing and coloring

      Programmable counters used for flow statistics and OAM loss measurements

      Programmable counters used for port utilization, microburst detection, delay measurements, flow tracking, elephant flow detection, and congestion tracking

      Traffic mirroring: (ER)SPAN on drop

      Support for sFlow and NetFlow

      Support for in-band telemetry


      APIs provided in both C++ and Python

      SAI and SONiC support

      Configurability via high-level networking objects

      Distribution-independent Linux packaging

      Robust simulation environment enables rapid feature development

      CPU packet I/O through native Linux network interfaces

P4 programmability

      Application development is handled by a P4-based IDE programming environment

      At compilation, the P4 application generates low-level register/memory access APIs and higher-level SDK Application APIs

      Provides application support for a wide range of data center, service provider, and enterprise protocols

      Ability to develop the SDK and applications running over the SDK over a simulated Cisco Silicon One device

Cisco P4 application

Due to Silicon One’s extensible P4 programming toolkit, we are always adding features to address new markets and new customer requirements; however, a sample of the features that are currently available with the P4 code is provided below:

Table 2.        Cisco P4 Applications

  Ethernet Switching

    802.1d, 802.1p, 802.1q, 802.1ad

  IP Tunneling

    IP in IP



  Integrated Routing and Bridging (IRB)
  Policy-Based Routing
  Security and QoS ACLs
  ECMP and LAG (802.3ad)


  Protection (Link/Node/Path and TI-LFA)
  QoS Classification and Marking
  Congestion Management

    NetFlow, sFlow

    In-Band Telemetry


    Packet Mirroring with Appended Metadata

    Lawful Intercept

  DDoS Mitigation

    Control-Plane Policing

    BGP Flowspec

  Timing and Frequency Synchronization



Product sustainability

Information about Cisco’s environmental, social, and governance (ESG) initiatives and performance is provided in Cisco’s CSR and sustainability reporting.

Table 3.        Cisco environmental sustainability information

Sustainability Topic



Information on product-material-content laws and regulations


Information on electronic waste laws and regulations, including our products, batteries, and packaging

WEEE Compliance

Information on product takeback and reuse program

Cisco Takeback and Reuse Program

Sustainability inquiries

Contact: csr_inquiries@cisco.com


Product packaging weight and materials

Contact: environment@cisco.com

For more information

Learn more about the Cisco Silicon One.




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