在很多场合,可以将Cisco路由器配置成为帧中继交换机。并且支持多台路由器通过NNI 连接构成一个更大的帧中继交换机。

本文将R2和R3互连,组成一个大交换机,为R1和R4实现通信。

 

 

 

R2:

no ip routing

frame-relay switching

interface Serial1/0
 encapsulation frame-relay
 clock rate 64000
 frame-relay lmi-type cisco
 frame-relay intf-type dce
 frame-relay route 104 interface Serial1/1 23
!
interface Serial1/1
 encapsulation frame-relay
 clock rate 64000
 frame-relay lmi-type cisco
 frame-relay intf-type nni
 frame-relay route 23 interface Serial1/0 104

R3:

no ip routing

frame-relay switching

interface Serial1/0
 encapsulation frame-relay
  clock rate 64000
 frame-relay lmi-type ansi
 frame-relay intf-type dce
 frame-relay route 401 interface Serial1/1 23
!
interface Serial1/1
 encapsulation frame-relay
 clock rate 64000
 frame-relay lmi-type cisco
 frame-relay intf-type nni
 frame-relay route 23 interface Serial1/0 401

R1:

interface Serial1/0
 ip address 192.168.14.1 255.255.255.0
 encapsulation frame-relay

R4:

interface Serial1/0
 ip address 192.168.14.4 255.255.255.0
 encapsulation frame-relay

对于Frame-Relay路由,可以通过 如下命令查看:

R2:

R3:

 

R1:

 

R4:

 

验证: