Which Cisco IOS feature allows devices to add Cisco Discovery Protocol, LLDP, and DHCP snooping attributes to RADIUS accounting messages?

The feature that allows devices to add Cisco Discovery Protocol (CDP), Link Layer Discovery Protocol (LLDP), and DHCP snooping attributes to RADIUS accounting messages is known as Device Sensor. Device Sensor collects detailed information from endpoints on the network and incorporates this data into RADIUS accounting messages sent to servers, such as a Cisco Identity Services Engine (ISE).

By utilizing Device Sensor, network devices can enhance their RADIUS accounting capabilities with additional context about endpoint identity and behavior. This includes information gleaned from CDP and LLDP, which discover and identify devices on the connected network, as well as insights from DHCP snooping to confirm the IP and MAC addresses of devices requesting network access.

This integration supports more granular policy enforcement and reporting in ISE, enabling organizations to implement more robust access control measures based on the identity and state of endpoints within the network. Therefore, Device Sensor plays a critical role in enriching RADIUS accounting with relevant device attributes and aiding in effective network management and security.