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Clarence Filsfils

Cisco Fellow

Engineering

Clarence Filsfils, a Cisco Systems Fellow, has a 20-year expertise leading innovation, productization, marketing and deployment for Cisco Systems. Trusted and respected by key decision makers across major WEB/OTT, SP’s and large Enterprises, Clarence enjoys working with these operators to listen to their needs and requirements, and then get things done from product design to deployment. He invented the Segment Routing Technology (over 40 patents) and is leading its productization, marketing and deployment at record execution speed. For this contribution, he and his team received the Pioneer Award - Cisco's most prestigious award honoring innovative engineering. The award celebrates engineering contribution that brings growth in new markets, redefines current markets, and provides game-changing improvements to engineering productivity. Previously, Clarence invented and led the Fast Routing Convergence Technology (over 30 patents) and was the lead designer for Cisco System’s QoS (20 patents) and large-scale IP/MPLS deployments. Clarence is a regular speaker at leading industry conferences. He holds over 140 patents and is a prolific writer, either in academic circle (Sigcomm 2015), or standard (8 RFC’s, 20 drafts on standard’s track) or books. Clarence holds a Masters in Management from Solvay Business School and a Masters of Engineering in Computer Science from the University of Liege.

Articles

February 12, 2026

SP360: SERVICE PROVIDER

IP Is Better Than Ever with Integrated Performance Measurement

5 min read

As networks become increasingly complex and dynamic—especially with SRv6 enabling new levels of service delivery— understanding and assuring their performance requires a new paradigm. Explore how Integrated Performance Measurement (IPM), combined with routing analytics and assurance, provides the game-changing visibility and granular insights your AI data center networks need to optimize network health and deliver superior user experiences in this advanced IP landscape.

IP Is Better Than Ever with SRv6 uSID

4 min read

SRv6 uSID has revolutionized IP network architectures by simplifying operations, adding robustness, and delivering best-in-class user experiences across service provider, hyperscaler, enterprise, and data center networks.