The AI Era Demands More Than Speed: Building Secure, Intelligent Networks from Silicon to Optics

Cisco research on the impact of AI on WAN traffic found that tasks performed by AI agents can generate up to 450% more network traffic than traditional user-driven workflows, with roughly 70% of that traffic attributed to AI inference, according to Cisco's Impact of AI on WAN Traffic study. Cisco said it is building a networking platform that combines silicon, optics, systems, and software with security fused into every layer, citing its Silicon One P200 processor's integrated MACsec capabilities and IEEE 802.1AE MACsec for Ethernet link protection. The company argues the network itself has become part of the security perimeter, requiring data-in-motion protection at line rate and near-zero latency as AI inference traffic becomes mission critical.

Welcome to the agentic AI era, where AI agents are becoming the new network power users, operating at machine speed rather than human speed. According to Cisco’s Impact of AI on WAN Traffic https://www.cisco.com/site/us/en/solutions/artificial-intelligence/mass-scale-infrastructure/ai-network-traffic-infographic.html research, tasks performed by AI agents can generate up to 450% more network traffic than traditional user-driven workflows, with approximately 70% of that traffic attributed to AI inference. As organizations embrace AI at scale, inference traffic is rapidly becoming mission critical. This new reality is transforming networking requirements. Infrastructure must move unprecedented volumes of data across campuses, metro networks, data centers, and cloud environments while maintaining security, reliability, and operational simplicity. Meeting that challenge requires more than faster links. It requires a platform approach. At Cisco, we’re building a networking platform that brings together silicon, optics, systems, and software, with security fused into every layer. By engineering these layers to work together, we help customers gain greater value from their network investments by simplifying operations and accelerating innovation. As AI traffic scales across networks, securing that traffic becomes just as important as transporting it. Why security matters more in the age of AI Historically, network security strategies focused on protecting the perimeter. Today’s AI-driven networks operate differently. AI training clusters move massive datasets between locations. Agentic AI systems continuously exchange information across applications, clouds, and data centers. Hyperscalers, service providers, and enterprises alike are carrying increasingly valuable data across optical infrastructure. The network itself has become part of the security perimeter. This creates two critical requirements: Protect the data. As AI models, datasets, and business intelligence become strategic assets, protecting data in motion against interception and tampering is paramount. Preserve performance. Security cannot become a bottleneck. AI workloads are highly sensitive to latency, throughput, and network efficiency. Encryption must operate at line rate and near-zero latency. Organizations need both. They cannot afford to compromise one for the other. Rethinking encryption for scale-across networks Today’s networks require a flexible, multi-layered approach to encryption that aligns with operational goals, infrastructure investments, and performance requirements. Whether supporting hyperscale AI clusters, service provider transport networks, or enterprise WAN deployments, organizations need encryption solutions that fit their environments. MACsec Media Access Control Security is a network standard from IEEE 802.1AE that protects data moving across local Ethernet links. Cisco offers the flexibility to deploy MACsec at different layers as needed by network operators. Encryption in silicon Embedding MACsec directly into network silicon allows operators to combine advanced routing capabilities with high-performance security. Cisco Silicon One exemplifies this approach. By integrating encryption capabilities directly into the forwarding architecture, organizations can secure traffic at scale while preserving operational simplicity and performance. Cisco’s Silicon One P200 processor extends this model with integrated MACsec capabilities designed for the next generation of high-capacity routing infrastructure. Encryption at the physical layer PHY-based encryption remains attractive where minimizing latency is the highest priority. Operating extremely close to the physical transmission layer enables exceptional performance. However, dedicated PHY-based implementations may introduce power and design tradeoffs, requiring operators to carefully balance security requirements against system-level efficiency. Encryption in optical transport systems Encryption in optical transport systems helps secure data as it moves across metro, regional, and long-haul networks, providing an additional layer of protection for traffic traversing shared or third-party infrastructure. By securing traffic at the transport layer, organizations can extend consistent security policies across network domains while helping meet compliance, sovereignty, and data protection requirements. Transport systems continue to play an important role in environments requiring network demarcation, regeneration, or multi-vendor interoperability. These architectures can provide clear security boundaries across network domains, though they may also add operational complexity, power consumption, and equipment footprint compared to pluggable alternatives. Encryption in the pluggable Coherent pluggable optics introduce a compelling alternative. By integrating encryption directly into coherent optical modules, operators gain the flexibility to add security exactly where it is needed without replacing existing routers or switch infrastructure. This approach extends the life of deployed platforms, especially for switches or routers that don’t have integrated MACsec. It allows security investments to be introduced incrementally and enables future cryptographic innovations to be deployed through module upgrades. This flexibility is becoming increasingly important as organizations prepare for a future that may require new cryptographic algorithms and quantum-resistant capabilities. To address these evolving requirements, Cisco recently announced MACsec capabilities for its 800ZR coherent pluggable https://acacia-inc.com/blog/accelerating-ai-scale-across-networks-with-secure-800zr-macsec/ , extending secure transport directly into the optical layer. By combining high-performance coherent optics with integrated encryption, customers can simultaneously address capacity growth and security requirements without introducing additional devices or operational complexity. The key advantage is choice. Cisco offers the flexibility to deploy MACsec at different layers as needed by network operators. As AI drives higher traffic volumes and more distributed infrastructure, no single encryption model fits every deployment. Supporting encryption across multiple layers gives organizations the flexibility to balance security, latency, operational simplicity, and investment protection as their networks evolve. The Cisco full-stack advantage: trust at every layer The location of encryption is important. Trusting the infrastructure that performs the encryption is equally critical. Cisco’s platform advantage extends beyond encryption itself. It encompasses the complete lifecycle of trust, from silicon to software to optics. At the foundation is Cisco’s Root of Trust RoT architecture, which establishes a hardware-based security anchor across the network. When encryption is deployed inside a pluggable coherent module, Root of Trust technology verifies firmware integrity through secure boot procedures and ensures device authenticity. This helps prevent unauthorized modifications and protects against counterfeit hardware entering the network. When encryption resides within routing platforms and silicon, the Root of Trust extends protection across the operating environment. It validates system software integrity and helps safeguard the cryptographic policies and keys that secure customer traffic. The result is a security architecture that protects not only data in transit, but also the infrastructure responsible for securing that data. This is the advantage of a platform designed with security integrated at every layer, extending protection from the silicon and operating environment to the network infrastructure that powers AI-driven operations. Preparing networks for the future The demands of AI will continue to reshape networking as organizations will need to manage increased traffic volumes, more distributed data, and intensified security requirements. Cisco is helping customers prepare for that future through a platform that brings together secure silicon, advanced optics, resilient systems, and intelligent software. The networks powering the AI era must be secure by design, trusted from the silicon to the optical layer, and flexible enough to evolve with the opportunities ahead. That is the promise of Cisco’s platform advantage. Join us at ECOC and PONC ECOC 2026 September 20 – 24, Málaga, Spain Visit Cisco at Booth 2008 https://www.cisco.com/site/us/en/learn/events/ecoc.html to see our latest optical, optics, and routing innovations and hear how customers are deploying them to power AI networks. Cisco Packet Optical Networking Conference PONC September 29 – October 1, Dallas, Texas Attend in person or virtually to explore the latest innovations in AI networking, optical systems, routing, optics, and secure transport infrastructure. Please reach out to your Account Executive for registration information. We look forward to connecting with you. Stay up on Thought Leadership from Cisco Get the latest blogs from Cisco Executives in your email. Subscribe to the Executive Platform https://app.feedpress.com/e/mailverify?feed id=CiscoExecutivePlatform Executive Perspectives Navigate the latest technology trends and get solutions with the help of Cisco executives. 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