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实验拓扑 如图:

PAP认证方式

1.配置 R0、R1路由器

	R0(config)#interface serial 2/0
	R0(config-if)#clock rate 64000
	R0(config-if)#ip address 192.168.10.1 255.255.255.0
	R0(config-if)#no shutdown
	%LINK-5-CHANGED: Interface Serial2/0, changed state to down
	
	R1(config)#interface serial 2/0
	R1(config-if)#clock rate 64000
	R1(config-if)#ip address 192.168.10.1 255.255.255.0
	R1(config-if)#no shutdown
	%LINK-5-CHANGED: Interface Serial2/0, changed state to down

2.配置端口封装的协议

	R0(config)#interface serial 2/0
	R0(config-if)#encapsulation ppp
	%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to down
	
	R1(config)#interface serial 2/0
	R1(config-if)#encapsulation ppp
	%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to up

3.配置路由器串口进行PAP认证 。R0为认证服务器，R1为认证客户端

	R0(config-if)#ppp authentication pap
	R0(config)#username R1 password 123
	%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to up
	
	R1(config-if)#ppp pap sent-username R1 password 123
	%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to up

5.验证

	R0#debug ppp authentication 
	PPP authentication debugging is on

CHAP认证方式

1.配置路由器串口进行CHAP认证。R0为认证服务器，R1为认证客户端

	R0(config)#interface serial 2/0
	R0(config-if)#encapsulation ppp
	R0(config-if)#ppp authentication chap
	R0(config)#username R1 password 123

	R1(config)#username R0 password 123

2.对配置进行诊断

	R0#debug ppp authentication
	PPP authentication debugging is on
	
	R1#debug ppp authentication
	PPP authentication debugging is on