Dynamic interfaces, also known as virtual interfaces, are created by users and designed to be analogous to the SVIs for wireless LAN clients. A controller can support up to 4000 dynamic interfaces. Each dynamic interface is individually configured and allows separate communications streams to exist on any or all of the controller's distribution ports. Each dynamic interface controls VLANs and other communications between controllers and other network elements, and each acts as a DHCP relay for wireless clients associated to the WLANs mapped to the interface. You can assign dynamic interfaces to distribution system, ports, WLANs, the Layer2 management interfaces, and the Layer 3 AP manager interface, and you can map the dynamic interface to a back-up port.
You can configure zero, one, or multiple dynamic interfaces on a distribution system port. However, all dynamic interfaces must be on a different VLAN or IP subnet from all other interfaces configured on the port. If the port is untagged, all dynamic interfaces must be on a different IP subnet from any other interface configured on the port.