From the course: Cisco CCNA (200-301) Cert Prep: 3 Security, Automation, and Programmability

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SDA overlay

SDA overlay

From the course: Cisco CCNA (200-301) Cert Prep: 3 Security, Automation, and Programmability

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SDA overlay

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- [Instructor] The SDA overlay is a beautiful thing. As an endpoint sends a frame to the first SDA node, the node will encapsulate the frame into a VXLAN tunnel and forward it to the next SDA node. At this point, the SDA nodes will continue to forward the frame based on its VXLAN tunnel information until it hits the last SDA node, which decapsulates it from its VXLAN wrapper and delivers it to the endpoint destination. All of this encapsulation and decapsulation actually happens within the switches' ASICs, so there's no performance penalty since it's done in hardware. The endpoint learning and forwarding process goes as follows in an SDA network. First, fabric edge nodes connecting the endpoint devices learn endpoint IPs and MACs in the normal fashion, and create a unique endpoint identifier or EID for each endpoint. As this EID is learned, it's then communicated to a centralized database called the LISP map server. The LISP map server maintains a list of the EIDs and their…

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