Cisco Secure ACS -- what protocol is used for communicating user credentials to Cisco Secure?

I am new to an environment that uses Cisco Secure ACS appliances. Sometimes I hear it referred to as TACACS which I think means that Cisco Secure ACS is being used to authenticate user ID and password from a Cisco router using TACACS protocol. But is that protocol only used for Cisco routers? Does ACS listen for LDAP requests?

Can someone help or point me to some entry level docs on how Cisco Secure interacts with different clients sending authentication requests?

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Steve JenningsIT ManagerAsked:
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InteraXConnect With a Mentor Commented:
ACS is a core cisco product for their security. It is as you rightly say a TACAS+ server, but is also a lot more.

Features include AAA(Authentication, Authorisation, Accounting), downloadable ACL's when authenticating users to VPN's/ethernet ports etc, is a core part of their NAC solution.

It can use an internal or external database for accounts (user or device), can integrate with RSA and a lot more.

Have you looked at the docs from the main porduct page on Cisco's website?

Config guides can be found at

Release notes at

Overview docs can be found at
DIPRAJConnect With a Mentor Commented:
try this out
try this
Steve JenningsIT ManagerAuthor Commented:
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