Step 1 Enter a test username command that can only establish one connection:
　　
　　Router(config)#username althea user-maxlinks 1 password settleback
　　
　　
　　Step 2 Configure AAA, name authentication, and PPP encapsulation on the interfaces that will be used as described in the following configuration example.
　　
　　Step 3 Use the show running-config command to verify the configuration.
　　
　　Step 4 Connect to the router using the connection-limited username.
　　
　　Step 5 Attempt to open a second connection.
　　
　　Step 6 Observe the failed PPP authentication相关配置
　　aaa new-model
　　aaa authorization network default local
　　enable secret saintstephen
　　enable password witharose
　　!
　　username sTephen user-maxlinks 5 password gardenhegoes
　　!
　　interface Serial0/0:23
　　no ip address
　　encapsulation ppp
　　dialer pool-member 1
　　ppp authentication chap
　　ppp multilink
　　!
　　interface Serial1/0
　　ip address 2.2.2.4 255.255.255.0
　　encapsulation ppp
　　dialer in-band
　　dialer map ip 2.2.2.13 name sTephen 12345
　　dialer-group 1
　　ppp authentication chap
　　!
　　interface Dialer0
　　ip address 1.1.1.4 255.255.255.0
　　encapsulation ppp
　　dialer remote-name sTephen
　　dialer string 23456
　　dialer pool 1
　　dialer-group 1
　　ppp authentication chap
　　ppp multilink
　　!
　　dialer-list 1 protocol ip permit
　　
　　
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