What are ACI interface sets?
The unit statement is not required in the dynamic profile when you configure an agent circuit identifier (ACI) interface set. For more information, see Defining ACI Interface Sets
We recommend that you use the VLAN underlying interface only for subscriber interfaces that contain agent circuit identifier (ACI) information in their DHCP or Point-to-Point Protocol over Ethernet (PPPoE) control packets. For more information, see Agent Circuit Identifier-Based Dynamic VLANs Components Overview
For more information, click Broadband Subscriber VLANs and Interfaces Feature Guide