What is the purpose of a control plane node in a Cisco SD-Access network fabric?
to maintain the endpoint database and mapping between endpoints and edge nodes
to detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node bindings
to identify and authenticate endpoints within the network fabric
to act as the network gateway between the network fabric and outside networks
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
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