This security principle is known as Authentication, Authorization and Accounting (AAA).īefore allowing and entity to perform certain actions, you must ensure you know who that entity actually is (Authentication) and if the entity is authorized to perform that action (Authorization). The same concepts can be applied to many use-cases, including: human interaction with a computer a computer’s interaction with a network even an application’s interaction with data. We need to have controls in place to ensure that only the correct entities are using our technological “gadgets”. With technology, we are faced with the same challenges. If the TSA agents weren’t operating the metal detectors and x-ray machines (and all the other things that slow us down when trying to reach our planes), then how would the FAA ever really enforce those policies? There are laws in the United States defining what a passenger of an airplane is permitted to bring onboard. In the world of security, we can only be as secure as our controls permit us to be. It's because what TACACS+ and RADIUS are designed to do are two completely different things! Let me explain: It's not that I don't love TACACS+, because I certainly do. I am one of many who fully and wholeheartedly believe that TACACS+ has no business being in ISE, and would prefer it never be added. I fully understand that a large percentage of these deployments would like to replace their existing ACS deployment with an ISE deployment and gain all the newer functionality that has been added to ISE, and in order to do so they require ISE to have all the features that ACS has, including TACACS+ support.
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I fully understand that there are millions of deployed instances of Cisco's Access Control Server (ACS) which is a AAA server that communicates with both RADIUS and TACACS+.
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As a regular speaker at Cisco Live and other industry conventions, I have literally spoken to tens-of-thousands of industry professionals, and I have yet to experience a public speaking engagement where someone does not ask me " when will Cisco Identity Services Engine" have TACACS+ support?"