sw-R2-3#show ver | i Software
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 15.0(2)SE3, RELEASE SOFTWARE (fc1)
Enter configuration commands, one per line. End with CNTL/Z.
server Server configuration
sw-R2-3(config)#tacacs server ?
WORD Name for the tacacs server configuration
sw-R2-3(config)#tacacs server foo
aaa new-model maybe?
This is one of many of my Cisco peavs... When I was first starting out with IOS (back when IOS 10 was new), I sat down with the ~1000 page documentation on authentication configuration. After a day of "why the f*** doesn't any of this work", I got to page 958-ish, where, as a complete after thought, the authors finally mention, "and you have to enter aaa new-model to turn any of this on." I think I actually burned that handbook. (and was never allowed to go to NANOG, because I might "do something" to that author.) F'ing CCIEs!