路由器配置成幀中繼交換機
Router(config)#frame-relay switching把路由器模擬成幀中繼交換機
Router(config)#inter s1/1
Router(config-if)#clock rate 128000
Router(config-if)#encapsulation frame-relay 配置接口封裝幀中繼
接口上啟用的默認幀中繼封裝為Cisco封裝，如果連接到非思科路由器，要使用itef參數
Router(config-if)#no shu
Router(config)#inter s1/2
Router(config-if)#clo rate 128000
Router(config-if)#encapsulation fr
Router(config-if)#no shu
changed state to upnointer s1/3
Router(config-if)#clo rate 128000
Router(config-if)#encapsulation fr
Router(config-if)#no shu
Router(config)#inter s1/1
Router(config-if)#frame-relay lmi-type cisco 配置LMI類型
Router(config-if)#frame-relay intf-type dce 配置接口為幀中繼的DCE
Router(config-if)#inter s1/2
Router(config-if)#frame-relay lmi-type cisco
Router(config-if)#frame-relay intf-type dce
Router(config-if)#inter s1/3
Router(config-if)#frame-relay lmi-type cisco
Router(config-if)#frame-relay intf-type dce
配置路由器兩個接口之間的pvc
Router(config)#inter s1/1
Router(config-if)#frame-relay route 103 inter s1/2 301
Router(config-if)#frame-relay route 104 inter s1/3 401
Router(config-if)#exit
Router(config)#inter s1/2
Router(config-if)#frame-relay route 301 inter s1/1 103
Router(config-if)#frame-relay route 304 inter s1/3 403
Router(config-if)#exit
Router(config)#inter s1/3
Router(config-if)#frame-relay route 401 inter s1/1 104
Router(config-if)#frame-relay route 403 inter s1/2 304
Router(config-if)#
Router#show frame-relay route
Input IntfInput DlciOutput Intf Output Dlci Status
Serial1/1 103 Serial1/2 301 active
Serial1/1 104 Serial1/3 401 active
Serial1/2 301 Serial1/1 103 active
Serial1/2 304 Serial1/3 403 active
Serial1/3 401 Serial1/1 104 active
Serial1/3 403 Serial1/2 304 active
表明路由器R2上配置3條PVC 狀態都是活動的
R1的配置
Router(config)#inter s1/1
Router(config-if)#ip address 172.16.134.1 255.255.255.0
Router(config-if)#encapsulation fr 接口封裝幀中繼
Router(config-if)#frame-relay lmi-type cisco
Router(config)#inter fa0/0
Router(config-if)#ip add
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#no shu
如果采用Cisco路由器的IOS是11.2及以后的版本，路由器可以自動協商LMI是類型
所以可以不配
Router(config)#router rip
Router(config-router)#ver 2
Router(config-router)#no auto-summary
Router(config-router)#network 172.16.134.0
Router(config-router)#network 192.168.1.0
Router(config-router)#exit
R3和R4同R1
ping測試
Router#ping 172.16.134.1 source 192.168.4.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.134.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.4.1
Success rate is 100 percent (5/5), round-trip min/avg/max = 120/155/200 ms
查看幀中繼的映射
Router#show frame-relay map
Serial1/1 (up): ip 172.16.134.3 dlci 103(0x67,0x1870), dynamic,
broadcast,, status defined, active
Serial1/1 (up): ip 172.16.134.4 dlci 104(0x68,0x1880), dynamic,
broadcast,, status defined, active
以上輸出顯示了逆向ARP的作用結果 表明路由器R1每個封裝幀中繼的接口都包含2條處于活動狀態的DLCI，每條都顯示了遠程Ip地址與本地的DLCI的映射關系
broadcast“參數允許在PVC上傳輸廣播或組播流量 “dynamic 表明動態映射
每臺路由器都不能ping通自己的串行接口的ip地址，但是可以ping通遠程封裝幀中繼的串行接口的ip地址 是因為自己的幀中繼映射表中沒有自己的接口ip地址和DLCI的映射條目。 逆向ARP做動態映射解決不了該問題，只能通過靜態映射解決
Router#show ip route rip
R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:07, Serial1/1
R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:27, Serial1/1
Router#show ip route rip
R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:00, Serial1/2
R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:05, Serial1/2
Router#show ip route rip
R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:18, Serial1/3
R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:27, Serial1/3
在本實驗中，幀中繼交換機在路由器R2上采用了PVC全互連的拓撲結構
但是在實際應用中，為了節省費用，一般采用(中心--分支)的拓撲結構
即只有分支到中心的PVC，假如R1是中心路由 R2和R3是分支路由
在R2上是配置如下
Router(config)#inter s1/2
Router(config-if)#no frame-relay route 304 interface s1/3 403
Router(config-if)#inter s1/3
Router(config-if)#no frame-relay route 403 interface s1/2 304
在R3和R4上
Router#show frame-relay map
Serial1/2 (up): ip 172.16.134.1 dlci 301(0x12D,0x48D0), dynamic,
broadcast,, status defined, active
Router#show frame-relay map
Serial1/3 (up): ip 172.16.134.1 dlci 401(0x191,0x6410), dynamic,
broadcast,, status defined, active
可以看到R3和R4上只有一條到中心站點路由器R1的映射
R4和R3的網絡不可達
R1
配置幀中繼的靜態映射
Router(config)#inter s1/1
Router(config-if)#no frame-relay inverse-arp
關閉逆向ARP ，默認是開啟的
Router(config-if)#frame-relay map ip 172.16.134.3 103 broadcast
配置幀中繼靜態映射
Router(config-if)#frame-relay map ip 172.16.134.4 104 broadcast
Router(config-if)#frame-relay map ip 172.16.134.1 104 broadcast
配置自己接口的ip地址的映射，目的是允許ping路由器該接口的ip地址
R3
Router(config)#inter s1/2
Router(config-if)#no frame-relay inverse-arp
Router(config-if)#frame-relay map ip 172.16.134.1 301 broadcast
Router(config-if)#frame-relay map ip 172.16.134.4 304 broadcast
Router(config-if)#frame-relay map ip 172.16.134.3 301 broadcast
R4
Router(config)#inter s1/3
Router(config-if)#no frame-relay inverse-arp
Router(config-if)#frame-relay map ip 172.16.134.1 401 broadcast
Router(config-if)#frame-relay map ip 172.16.134.3 403 broadcast
Router(config-if)#frame-relay map ip 172.16.134.4 401 broadcast
R1#show frame-relay map
Serial1/1 (up): ip 172.16.134.1 dlci 104(0x68,0x1880), static,
broadcast,
CISCO, status defined, active
Serial1/1 (up): ip 172.16.134.3 dlci 103(0x67,0x1870), static,
broadcast,
CISCO, status defined, active
Serial1/1 (up): ip 172.16.134.4 dlci 104(0x68,0x1880), static,
broadcast,
CISCO, status defined, active
R3#show frame-relay map
Serial1/2 (up): ip 172.16.134.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
Serial1/2 (up): ip 172.16.134.3 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
Serial1/2 (up): ip 172.16.134.4 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
R4#show frame-relay map
Serial1/3 (up): ip 172.16.134.1 dlci 401(0x191,0x6410), static,
broadcast,
CISCO, status defined, active
Serial1/3 (up): ip 172.16.134.3 dlci 401(0x191,0x6410), static,
broadcast,
CISCO, status defined, active
Serial1/3 (up): ip 172.16.134.4 dlci 401(0x191,0x6410), static,
broadcast,
CISCO, status defined, active
封裝幀中繼每個接口都采用了靜態映射
R1#show ip route rip
R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:26, Serial1/1
R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:07, Serial1/1
R1#show ip interface s1/1
Serial1/1 is up, line protocol is up
Internet address is 172.16.134.1/24
Broadcast address is 255.255.255.255
Split horizon is disabled接口封裝幀中繼后，水平分割被自動關閉
R1(R1(config)#inter s1/1
R1(config-if)#ip split-horizon 開啟水平分割
R1#clear ip route * 清除路由表
R1#show ip route rip
R192.168.4.0/24 [120/1] via 172.16.134.4, 00:00:07, Serial1/1
R192.168.3.0/24 [120/1] via 172.16.134.3, 00:00:11, Serial1/1
重新獲得
R3#show ip route rip
R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:15, Serial1/2
R4#show ip route rip
R192.168.1.0/24 [120/1] via 172.16.134.1, 00:00:06, Serial1/3
R3沒有了R4的路由
R4沒有了R3的路由
