Privilege level 15 in IOS has all the possible commands for particular IOS release enabled. However, for example privilege level 1 has only few dozens of commands available. Now if I want to allow some of the privilege level 15 commands also for privilege level 1, then I could use the privilege exec level 1 <command> command. For example privilege exec level 1 traceroute. However, is there a way to do this centrally in TACACS+ server?

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Yes, this is the exact purpose of the second "a" in "aaa". Authorization is the process of limiting which commands a user is able to execute based on their user/group profile.

There are many different products that provide aaa services in a centralized manner, some paid and some free.


Definitely yes. I personally prefer this tacacs+ implementation http://www.pro-bono-publico.de/projects/tac_plus.html And use setup similar to http://blog.one-it.de/open-source-multidevice-multiuser-tacacs/ Relevant portion of the config is USERGROUPS.

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