The SD-Access control-plane node performs the LISP Map-Server and Map-Resolver functions. Cisco SD-Access uses LISP in the control plane to maintain mappings between endpoint identifiers and routing locators. Fabric edge nodes discover local endpoints and register them with the control-plane node. When a destination endpoint is not known locally, a fabric node queries the control-plane node, which resolves the endpoint location and returns the locator information needed for VXLAN forwarding through the fabric. This is why the control-plane node is the correct answer. A fabric edge node connects endpoints, provides the anycast gateway, encapsulates and decapsulates user traffic, and registers endpoints. A border node connects the fabric to external networks. An intermediate node simply transports routed underlay traffic between fabric nodes and does not hold endpoint mappings. In design terms, control-plane placement and redundancy are critical because endpoint mobility, fabric forwarding lookup, and location resolution depend on stable Map-Server and Map-Resolver services. Reference topics: Cisco SD-Access control plane, LISP Map-Server, LISP Map-Resolver, EID-to-RLOC mapping, fabric edge registration.
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