要想搭建如下图所示网络环境，我们使用GNS模拟器来搭建
按照下图放入路由器R1、R4、R5、和frame-relay-switch
第二步：配置Frame-relay-switch 的端口分别为：1、4、5
ip address 10.0.0.1 255.0.0.0
encapsulation frame-relay
frame-relay map ip 10.0.0.5 105 broadcast
frame-relay map ip 10.0.0.4 104 broadcast
ip address 10.0.0.4 255.0.0.0
encapsulation frame-relay
frame-relay map ip 10.0.0.5 401
frame-relay map ip 10.0.0.1 401 broadcast
no frame-relay inverse-arp
ip address 10.0.0.5 255.0.0.0
encapsulation frame-relay
frame-relay map ip 10.0.0.4 501
frame-relay map ip 10.0.0.1 501 broadcast
no frame-relay inverse-arp
按照上面的方法配置好之后就可以实现R1、R4、R5之间的互通，R1做为帧中继的hub
本文转自zcm8483 51CTO博客，原文链接:http://blog.51cto.com/haolun/993154