Service Provider (SP) Model

Not all service providers have the same business models. Some service providers build their infrastructure, and some don't. The ones that don't build their infrastructure typically purchase from those that do. For this reason, the AAA configurations might tend to be slightly different. In the end, AAA still serves the same purpose you saw in an enterprise environment. The difference here is that the server used for AAA might need to handle thousands of requests for service authorization per second. The Cisco CNS Access Registrar (AR) is a carrier class RADIUS server designed to specifically meet the needs of today's service providers.