Which hardware component is used in the Cisco SD‑WAN authentication process on ISR platforms?

The SUDI (Secure Unique Device Identifier) is a hardware-anchored certificate embedded in Cisco devices during manufacturing. In Cisco SD-WAN, the vManage controller uses the SUDI certificate to authenticate ISR (Integrated Services Router) platforms attempting to join the SD-WAN fabric. This ensures that only legitimate Cisco devices are onboarded, providing a strong foundation for trust and security. ZTP (Zero Touch Provisioning) is a method for automated device deployment, not an authentication component itself, although it leverages SUDI for secure onboarding. OTPC (One-Time Programmable Chip) is a general term for a type of chip that can be programmed only once, not a specific Cisco authentication component. TPMD (Trusted Platform Module Device) is a security chip found in many computing devices, but Cisco ISRs specifically use SUDI for SD-WAN authentication.