Cisco SD-Access LAN automation deploys IS-IS as the underlay routing protocol to build node-to-node adjacencies automatically. The underlay must provide stable IP reachability between fabric nodes before the overlay control plane and VXLAN data plane can operate correctly. Cisco SD-Access design guidance uses an automated routed access underlay in which point-to-point links are discovered and provisioned, and IS-IS is used to advertise infrastructure reachability. This approach reduces manual configuration, accelerates brownfield or greenfield onboarding, and creates a consistent transport foundation for the fabric. LISP is used in the SD-Access control plane for endpoint mapping, not for building underlay adjacencies. VXLAN is the overlay data-plane encapsulation and does not establish routing adjacencies. OSPF can be used in some routed networks, but LAN automation for SD-Access uses IS-IS as the automated underlay protocol. Reference topics: SD-Access LAN automation, routed underlay, IS-IS underlay, fabric node discovery, Cisco Catalyst Center automation.
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