实验拓扑:
实验要求: R1 通过 FR 分别与 R2 和 R3 相连, R2 与 R3 无连接,这样形成一个 hub and spoke 型网络拓扑,然后在 R1 上采用点对多点子接口, R2 和 R3 采用物理接口。
试验目的:掌握在 hub and spoke 网络环境下 hub 路由器与 spoke 路由器的基本配置。 实验配置:
R1 :
R1(config)#int s1/0
R1(config-if)#enca fram
R1(config-if)#no shu
R1(config-if)#exit
R1(config)#int s1/0.1 multipoint
R1(config-subif)#ip add 172.16.3.3 255.255.255.0
R1(config-subif)#fram interface-dlci 301
R1(config-fr-dlci)#exit
R1(config-subif)#fram interface-dlci 302
R1(config-fr-dlci)#exit
R2 :
R2(config)#int s1/0
R2(config-if)#enca fram
R2(config-if)#ip add 172.16.3.1 255.255.255.0
R2(config-if)#no shu
R3 :
R3(config)#int s1/0
R3(config-if)#enca fram
R3(config-if)#ip add 172.16.3.2 255.255.255.0
R3(config-if)#no shu
这样配置后我们分别查看三台路由器的 fram map :
R1#show fram map
Serial1/0.1 (up): ip 172.16.3.1 dlci 301(0x12D,0x48D0), dynamic,
broadcast,, status defined, active
Serial1/0.1 (up): ip 172.16.3.2 dlci 302(0x12E,0x48E0), dynamic,
broadcast,, status defined, active
R2#show fram map
Serial1/0 (up): ip 172.16.3.3 dlci 103(0x67,0x1870), dynamic,
broadcast,, status defined, active
R3#show fram map
Serial1/0 (up): ip 172.16.3.3 dlci 203(0xCB,0x30B0), dynamic,
broadcast,, status defined, active
全部都 active ,并且都有地址到 DLCI 的映射,下面我们在 R1 上 ping R2/R3 ,验证:
R1#ping 172.16.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 144/198/284 ms
R1#ping 172.16.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 144/205/404 ms
可以 ping 通,下面在 R2 上 ping R3 看结果:
R2#ping 172.16.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.3.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
无法 ping 通,再查看一下 R2/R3 的 fram map 时发现没有到远端地址与 DLCI 的映射,同全物理接口一样, R2/R3 上都需要加上映射:
R2(config-if)#fram map ip 172.16.3.2 103 br
R3(config-if)#fram map ip 172.16.3.1 203 br
再查看一下他们的 fram map :
R2#show fram map
Serial1/0 (up): ip 172.16.3.2 dlci 103(0x67,0x1870), static,
broadcast,
CISCO, status defined, active
Serial1/0 (up): ip 172.16.3.3 dlci 103(0x67,0x1870), dynamic,
broadcast,, status defined, active
R3#show fram map
Serial1/0 (up): ip 172.16.3.1 dlci 203(0xCB,0x30B0), static,
broadcast,
CISCO, status defined, active
Serial1/0 (up): ip 172.16.3.3 dlci 203(0xCB,0x30B0), dynamic,
broadcast,, status defined, active
注意区别,一个是动态学到的,一个是手动添加的。。然后进行 ping 验证:
R2#ping 172.16.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 288/354/428 ms
OK ,通了 ~~ 实验总结:在 hub and spoke 拓扑环境下,如果 spoke 路由器采用的是物理接口,无论 hub 路由器采用哪种接口, spoke 路由器上都需要做到远端 spoke 路由器的 IP 与 DLCI 的静态映射。
本文转自loveme2351CTO博客,原文链接:http://blog.51cto.com/loveme23/43628,如需转载请自行联系原作者