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Cisco 1841 Configuration Issue

I have review some configuration in a Cisco 1841 router, use to form VPN tunnel with another site but I have no idea what the follow statement is used for. Can anyone explain the purpose of the following statement

aaa new-model (???)
aaa authentication login userauthen group radius (???)
aaa authorization network group author local (???)
:
:
aaa session-id common (???)
:
:
crypto ipsec df-bit clear (???)
:
crypto map mysite client authentication list userauthen (???)
crypto map mysite isakmp authorization list groupauthor (???)
crypot map mysite client configuration address respond (???)
crypto map mysite 10 ipsec-isakmp
set peer xxx.xxx.xx.xx
:
qos pre-classify (???)

:

radius-server host xxx.xxx.xxx.xx auth-port 1645 acc-port 1646 key cisco (???)

Scotty_cisco

everything starting AAA is for the radius authentication peices Authenication Authorization and Accounting. Everything starting with a Crypto is for VPN access and authentication of the VPN users.

Thanks
Scott

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Scotty_cisco

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AXISHK

ASKER

For the statement

As far as I know, a shared key is involvied to form a tunnel between two site. What is the purpose of this statement ?
Does it mean the VPN tunnel to be authenticated through RADIUS before a tunnel could be built ?

crypto map mysite client authentication list userauthen
crypto map mysite isakmp authorization list groupauthor
crypot map mysite client configuration address respond

AXISHK

ASKER

Thank for your hints, finally crack it !