Radio Resource Management (RRM) is an essential feature that optimizes wireless network performance by managing the radio frequencies in use. In a Cisco SD-Access wireless solution, RRM is performed by the wireless controller. The controller continuously monitors and manages aspects such as radio frequency assignment, power levels, and channel settings to ensure optimal performance and coverage for wireless clients. It dynamically adjusts these settings based on the environment and network conditions to maintain the best possible wireless experience.
Fabric wireless controllers manage and control the fabric-mode APs using the same general model as the traditional local-mode controllers which offers the same operational advantages such as mobility control and radio resource management. A significant difference is that client traffic from wireless endpoints is not tunnelled from the APs to the wireless controller. Instead, communication from wireless clients is encapsulated in VXLAN by the fabric APs which build a tunnel to their first-hop fabric edge node. Wireless traffic it tunneled to the edge nodes as the edge nodes provide fabric services such as the Layer 3 Anycast Gateway, policy, and traffic enforcement.https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html