helps implement peer-to-peer transfers within a virtual hierarchy of devices in the same coherency domain. It also supports memory sharing of the same memory segment between multiple devices, as opposed to memory pooling where each device was assigned a separate segment.

CXL 3.0 allows multiple Type 1 and Type 2 devices per each CXL root port; it also adds multi-level switching, helping implement device fabrics with non-tree topologies like mesh, ring, or spline/leaf. Each node can be a host or a device of any type. Type 3 devices can