把一台Cisco路由器配置为帧中继交换机

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1、实验目的

通过本实验可以掌握

A.理解帧中继交换机工作原理;

B.理解PVC的概念;

C.用路由器模拟帧中继交换机的配置。

2、网络拓扑图:


3、实验步骤

本实验把路由器R2配置成帧中继交换机

(一)开启帧中继交换机功能

R2(config)#frame-relay switching

(二)配置接口封装帧中继

R2(config)#interface s0/0

R2(config-if)#clock rate 128000

R2(config-if)#encapsulation frame-relay //配置接口封装帧中继

R2(config-if)#no shutdown

【提示】

配置接口封装为帧中继,接口上启用的默认帧中继封装为Cisco封装。如果要连接到另一台Cisco路由器,则使用该选项;如果连接到非Cisco路由器,要使用ietf参数。

R2(config)#interface serial 0/1


R2(config-if)#clock rate 128000

R2(config-if)#encapsulation frame-relay

R2(config-if)#no shutdown


R2(config)#interface serial 0/2

R2(config-if)#clock rate 128000

R2(config-if)#encapsulation frame-relay

R2(config-if)#no shutdown

(三)配置帧中继LMI类型和接口类型

R2(config)#interfaces0/0

R2(config-if)#frame-relaylmi-type cisco //配置LMI类型

R2(config-if)#frame-relayintf-type dce //配置接口为帧中继的DCE

【技术要点】

A、命令“frame-relaylmi-type { cisco | ansi | q933a }”用来配置LMI的类型,默认时是Cisco类型;

B、命令“frame-relayintf-type { dce |dte }”用来配置接口是帧中继的DCE还是DTE。要注意的是:帧中继接口DCE和物理接口端是DCE还是DTE无关,也就是说即使接口是DTE端,也可以把它配置成帧中继是DCE

R2(config)#interfaceserial 0/1

R2(config-if)#frame-relaylmi-type cisco

R2(config-if)#frame-relayintf-type dce

R2(config)#interfaceserial 0/2

R2(config-if)#frame-relaylmi-type cisco

R2(config-if)#frame-relayintf-type dce

(四)配置路由器两个接口之间的PVC

R2(config)#interfaceserial 0/0

R2(config-if)#frame-relayroute 103 interface s0/1 301

//定义接口S0/0S0/1之间的PVC,建立帧中继交换表

R2(config-if)#frame-relayroute 104 interface s0/2 401

//定义接口S0/0S0/2之间的PVC,建立帧中继交换表

R2(config)#interfaceserial 0/1

R2(config-if)#frame-relayroute 301 interface serial 0/0 103

R2(config-if)#frame-relayroute 304 interface serial 0/2 403

R2(config)#interfaceserial 0/2

R2(config-if)#frame-relayroute 401 interface serial 0/0 104

R2(config-if)#frame-relayroute 403 interface serial 0/1 304

4、实验调试

A、show frame-relay route

R2#shframe-relay route

InputIntf Input Dlci Output Intf Output Dlci Status

Serial0/0 103 Serial0/1 301 inactive

Serial0/0 104 Serial0/2 401 inactive

Serial0/1 301 Serial0/0 103 inactive

Serial0/1 304 Serial0/2 403 inactive

Serial0/2 401 Serial0/0 104 inactive

Serial0/2 403 Serial0/1 304 inactive

R2#

以上输出表明了路由器R2上配置了3PVC,状态都是活动的,其中

Serial0/0 103 Serial0/1 301 inactive”的含义是路由器如果从S0/0接口收到DLCI=103的帧,要从S0/1接口交换出去,并且DLCI被替换为301

B、show frame-relay pvc

该命令用于显示路由器上配置的所有PVC的统计信息。

R2#shframe-relay pvc interface s0/0


PVC Statistics for interface Serial0/0 (Frame Relay DCE)

//该接口是帧中继的DCE

Active Inactive Deleted Static

Local 0 0 0 0

Switched 0 2 0 0

Unused 0 0 0 0

//输出表明该接口有2条处于活动状态的PVC

DLCI =103, DLCI USAGE = SWITCHED, PVC STATUS = INACTIVE, INTERFACE = Serial0/0

//DLCI103PVC处于活动状态,本地接口是S0/0DLCI用途是完成帧中继DLCI交换

input pkts 0 output pkts 0 in bytes 0

out bytes 0 dropped pkts 0 in pkts dropped 0

out pkts dropped 0 out bytes dropped 0

in FECN pkts 0 in BECN pkts 0 out FECN pkts 0

out BECN pkts 0 in DE pkts 0 out DE pkts 0

out bcast pkts 0 out bcast bytes 0

30 second input rate 0 bits/sec, 0packets/sec

30 second output rate 0 bits/sec, 0packets/sec

switched pkts 0

Detailed packet drop counters:

no out intf 0 out intf down 0 no out PVC 0

in PVC down 0 out PVC down 0 pkt too big 0

shaping Q full 0 pkt above DE 0 policing drop 0

pvc create time 00:28:35, last time pvcstatus changed 00:28:35

//以上输出是DLCI103PVC的统计信息

DLCI =104, DLCI USAGE = SWITCHED, PVC STATUS = INACTIVE, INTERFACE = Serial0/0


input pkts 0 output pkts 0 in bytes 0

out bytes 0 dropped pkts 0 in pkts dropped 0

out pkts dropped 0 out bytes dropped 0

in FECN pkts 0 in BECN pkts 0 out FECN pkts 0

out BECN pkts 0 in DE pkts 0 out DE pkts 0

out bcast pkts 0 out bcast bytes 0

30 second input rate 0 bits/sec, 0packets/sec

30 second output rate 0 bits/sec, 0packets/sec

switched pkts 0

Detailed packet drop counters:

no out intf 0 out intf down 0 no out PVC 0

in PVC down 0 out PVC down 0 pkt too big 0

shaping Q full 0 pkt above DE 0 policing drop 0

pvc create time 00:26:45, last time pvcstatus changed 00:26:45

//以上输出是DLCI104PVC的统计信息

R2#

C、show frame-relay lmi

该命令用来查看LMI的统计信息。

R2#shframe-relay lmi


LMIStatistics for interface Serial0/0 (Frame Relay DCE) LMI TYPE = CISCO

//接口S0/0是帧中继的DCE,LMI类型为Cisco

Invalid Unnumbered info 0 Invalid Prot Disc 0

Invalid dummy Call Ref 0 Invalid Msg Type 0

Invalid Status Message 0 Invalid Lock Shift 0

Invalid Information ID 0 Invalid Report IE Len 0

Invalid Report Request 0 Invalid Keep IE Len 0

Num Status Enq. Rcvd 0 Num Status msgs Sent 0

//帧中继交换机收到的LMI状态查询消息的数量以及从帧中继交换机向路由器发送的LMI状态信息的数量

Num Update Status Sent 0 Num St Enq. Timeouts 232

//以上7行显示了接口S0/0LMI的统计信息

LMIStatistics for interface Serial0/1 (Frame Relay DCE) LMI TYPE = CISCO

Invalid Unnumbered info 0 Invalid Prot Disc 0

Invalid dummy Call Ref 0 Invalid Msg Type 0

Invalid Status Message 0 Invalid Lock Shift 0

Invalid Information ID 0 Invalid Report IE Len 0

Invalid Report Request 0 Invalid Keep IE Len 0

Num Status Enq. Rcvd 0 Num Status msgs Sent 0

Num Update Status Sent 0 Num St Enq. Timeouts 185

//以上7行显示了接口S0/1LMI的统计信息

LMIStatistics for interface Serial0/2 (Frame Relay DCE) LMI TYPE = CISCO

Invalid Unnumbered info 0 Invalid Prot Disc 0

Invalid dummy Call Ref 0 Invalid Msg Type 0

Invalid Status Message 0 Invalid Lock Shift 0

Invalid Information ID 0 Invalid Report IE Len 0

Invalid Report Request 0 Invalid Keep IE Len 0

Num Status Enq. Rcvd 0 Num Status msgs Sent 0

Num Update Status Sent 0 Num St Enq. Timeouts 181

//以上7行显示了接口S0/2LMI的统计信息

R2#


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