In a wireless Cisco SD-Access deployment, which roaming method is used when a user moves from one AP to another on a different access switch using a single WLC?
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In a wireless Cisco SD-Access deployment, the roaming method used when a user moves from one AP to another on a different access switch using a single WLC is typically Fast Roaming.
Fast Roaming is a method that allows for seamless and secure roaming between access points, enabling mobile devices to maintain their connection to the network as they move from one access point to another. This method is achieved through the use of pre-authentication and pre-association processes, which enable the client device to establish a connection to the new access point before it physically moves to the new location.
Fast Roaming uses a combination of 802.11r, 802.11k, and 802.11v standards to minimize the amount of time it takes for a mobile device to re-associate with the new access point. The 802.11r standard allows for fast, secure re-authentication of the client device with the new access point, while the 802.11k standard provides information about neighboring access points to help the client device decide which access point to roam to. The 802.11v standard provides information about the QoS capabilities of the access points.
In contrast, Layer 3 roaming involves a complete re-authentication process between the client device and the new access point, which can result in a disruption of the connection. Inter-xTR roaming is used in a Cisco SD-Access deployment where the user is moving between different virtual networks, and auto anchor roaming is used in a multi-WLC deployment where the user is moving between different physical locations.
Overall, Fast Roaming is the preferred method in a wireless Cisco SD-Access deployment when a user moves from one AP to another on a different access switch using a single WLC, as it provides seamless and secure roaming without disrupting the user's connection.