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"In Cisco networking, Inter-xTR Roaming refers to a seamless wireless client handover (roaming) between access points (APs) managed by different Wireless LAN Controllers (WLCs) or different parts of a fabric, often involving Software-Defined Access (SDA) or LISP (Locator ID Separation Protocol) for efficient location updates, ensuring continuous connectivity as users move across the network infrastructure. Essentially, when a device moves between APs handled by different controllers, it's an "Inter-xTR" event, differentiating it from Intra-xTR (within the same controller) roaming. "
In this case, since the user is moving between APs connected to different access switches but staying within the same WLC, the fabric handles the mobility through a seamless Layer 2 handoff without requiring inter-xTR communication. The new fabric edge node updates the control plane (map server) with the client's new location, and traffic forwarding is adjusted accordingly.
Fast Roaming is often used to refer to intracontroller roaming (i.e., roaming within the same WLC).