AAA authorization commands

Question

Hi All
Probably i am going to ask a stupid question but i am really confused regarding the purpose of "aaa authorization commands x default local" command. I understand that if this command is configured, it authorizes each and every command of that level but in my experience, this command is not doing anything. The outcome is same whether it is configured or not.
Following is my aaa part config
username cisco privilege 15 secret cisco 
aaa new-model
aaa authentication login default local enable
aaa authorization exec default local if-authenticated
aaa authorization commands 15 default local if-authenticated
Now whether i keep the last command or remove it, username "cisco" is able to use every level 15 command so my question is, why i bother configuring this command?
Would really appreciate your quick reply
Regards

Answer 1

Thanx a lot for your quick response. Really appreciate that.
So does this mean, can i safely assume that if i am using local database then i don't require "aaa authorization command level" command??
that is following should be the config
username cisco privilege 15 secret cisco 
aaa new-model
aaa authentication login default local enable
aaa authorization exec default local if-authenticated
privilege exec level 15 show   (just an example)
privilege exec level 15 debug
I have tested this and it worked fine without using "aaa authorization command level"
Moreover, regarding the use of AAA server, my eventual plan is to use TACACS+ but before that,  i wanted to get a good grip of AAA functionality and therefore started off with local user database.  
So u mean to say, if i am using TACACS+ for authentication and authorization purposes and in ACS Server, user "cisco" has been assigned level 15 but with authorization set of "show" and "debug" only then by using "aaa authorization commands level" in a router, i can successfully restrict user "cisco" to "debug" and "show" only? In my point of view, i can achieve this anyway (restricting "cisco" user to only use "show and debug) without using "aaa authorization command level" (like i tested with local database)??
will really appreciate your kind response