华三ppp协议

创建用户
[nat]local-user  xpl class network
[nat-luser-network-xpl]password simple xplxpl

服务类型为ppp
[nat-luser-network-xpl]service-type ppp
[nat-luser-network-xpl]quit
进入接口分配配置IP地址并开启ppp协议认证
[nat]interface Serial 1/0
[nat-Serial1/0]link-protocol ppp
[nat-Serial1/0]ppp authentication-mode pap

在另外一台输入命令。
[isp]interface Serial 1/0
[isp-Serial1/0]link-protocol ppp
[isp-Serial1/0]ppp pap local-user xpl password simple xplxpl