Although Ive never tested it in a lab environment if youre using Cisco Secure ACS on an NT user database that is LDAP, I dont foresee it being a problem. You might also check it with the TAC team to verify.
For what it's worth.. The Windows 2000 resource kit contains a tool that allows authentication to be passed from a Cisco Router to a Win2K domain controller. I assume that it uses LDAP.
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