使用路由器模拟帧中继配置

conf t

frame-relay switching开启帧中继交换机功能

interface s1/0在这个接口（连接hub路由器的那个接口）模式下

description Link to RouterA配置一个描述信息

encapsulation frame-relay封装成帧中继链路

frame intf-type dce配置成DCE

frame route 102 interface s1/1 201 接口是从s1/0为进方向，往外地那个接口

frame route 103 interface s1/2 301 配置帧中继交换机，DLCI和接口的映射

interface s1/1

description Link to RouterB

encapsulation frame-relay

frame-relay intf-type dce

frame-relay route 201 interface s1/0 102

frame-relay route 203 interface s1/2 302

interface s1/1

description Link to RouterC

encapsulation frame-relay

frame-relay intf-type dce

frame-relay route 301 interface s1/0 103

frame-relay route 302 interface s1/1 203