CCNA配置试验之九 帧中继――点到多点（point-to-multipoint）子接口

CCNA配置试验之九 帧中继——点到多点（point-to-multipoint）子接口

上篇博文中我们试验验证了，帧中继point-to-point。今天我们来验证帧中继的point-to-multipoint。

试验拓扑如下：

试验拓扑说明：（拓扑做的有点烂，大家多担待点 。呵呵）

试验拓扑说明： R1 的物理接口不添加 IP 。 R1 的子接口 S0/0.1 的 ip 为 192.168.1.1 。 R2 的 ip 为 192.168.1.2 。 R3 的 ip 为 192.168.1.3 。 R4 的 ip 为 192.168.1.4 网络掩码都为 255.255.255.0 。

R1 上 S0/0.1 的 DLCI 号为 102. 103. 104

R2 上 S0/0 的 DLCI 号为 201

R3 上 S0/0 的 DLCI 号为 301

R4 上 S0/0 的 DLCI 号为 401

试验要求：在路由器间完成帧中继——点到多点的配置。最终使 R1分别 和 R2 R3 R4 通讯，而 R2 R3 R4 之间不能相互通讯。

 

好了，开始试验吧！

 

R1

 

Router>en

Router#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#host r1

r1(config)#int s0/0

r1(config-if)#no ip addr

r1(config-if)#no shut

r1(config-if)#encapsulation frame-relay  在物理接口下封装frame-relay

r1(config-if)#no frame-relay inverse-arp关闭帧中继的反向ARP功能

r1(config-if)#exit

r1(config)#int s0/0.1 multipoint  配置点到多点的frame-relay

r1(config-subif)#ip addr 192.168.1.1 255.255.255.0

r1(config-subif)#no shut

r1(config-subif)#frame-relay map ip 192.168.1.2 102 broadcast映射ip地址

r1(config-subif)#frame-relay map ip 192.168.1.3 103 broadcast与帧中继地

r1(config-subif)#frame-relay map ip 192.168.1.4 104 broadcast址

 

 

R2

 

Router>en

Router#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#host r2

r2(config)#int s0/0

r2(config-if)#ip addr 192.168.1.2 255.255.255.0

r2(config-if)#no shut

r2(config-if)#encapsulation frame-relay在接口下封装frame-relay

r2(config-if)#no frame-relay inverse-arp关闭帧中继的反向ARP功能

r2(config-if)#frame-relay map ip 192.168.1.1 201 broadcast映射ip地址与帧 中继地址

 

R2 R3 R4的配置是一样的，往下就不再文字解释了。

 

 

R3

 

Router>en

Router#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#host r3

r3(config)#int s0/0

r3(config-if)#ip addr 192.168.1.3 255.255.255.0

r3(config-if)#no shut

r3(config-if)#encapsulation frame-relay

r3(config-if)#no frame-relay inverse-arp

r3(config-if)#frame-relay map ip 192.168.1.1 301 broadcast

 

 

R4

 

Router>en

Router#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#host r4

r4(config)#int s0/0

r4(config-if)#ip addr 192.168.1.4 255.255.255.0

r4(config-if)#no shut

r4(config-if)#encapsulation frame-relay

r4(config-if)#no frame-relay inverse-arp

r4(config-if)#frame-relay map ip 192.168.1.1 401 broadcast

 

 

验证：

R1 分别 ping R2 R3 R4 结果表明他们之间能相互通讯

 

r1#ping 192.168.1.2

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 144/344/568 ms

r1#ping 192.168.1.3

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 216/304/500 ms

r1#ping 192.168.1.4

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.4, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 288/373/504 ms

 

 

R2 ping R3 R4 结果不能相互通讯

 

r2#ping 192.168.1.3

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.3, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

r2#ping 192.168.1.4

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.4, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

 

 

 R3 ping R4不能通讯

r3#ping 192.168.1.4

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.4, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

 

 

在 R1 上 show int S0/0 查看接口信息，

 

r1#show int s0/0

Serial0/0 is up, line protocol is up

  Hardware is M4T

  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation FRAME-RELAY, crc 16, loopback not set

  Keepalive set (10 sec)

  Restart-Delay is 0 secs

  LMI enq sent  43, LMI stat recvd 44, LMI upd recvd 0, DTE LMI up

  LMI enq recvd 0, LMI stat sent  0, LMI upd sent  0

  LMI DLCI 0  LMI type is ANSI Annex D  frame relay DTE

  FR SVC disabled, LAPF state down

  Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0

  Last input 00:00:04, output 00:00:04, output hang never

  Last clearing of "show interface" counters 00:07:14

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: weighted fair

  Output queue: 0/1000/64/0 (size/max total/threshold/drops)

     Conversations  0/1/256 (active/max active/max total)

     Reserved Conversations 0/0 (allocated/max allocated)

     Available Bandwidth 1158 kilobits/sec

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     89 packets input, 5416 bytes, 0 no buffer

 --More--

 

 

在路由器 R1 R2 R3 R4 上 show frame map 查看当前映射项和 DLCI 映射表的相关信息。

r1#show frame map

Serial0/0.1 (up): ip 192.168.1.2 dlci 102(0x66,0x1860), static,

              broadcast,

              CISCO, status defined, active

Serial0/0.1 (up): ip 192.168.1.3 dlci 103(0x67,0x1870), static,

              broadcast,

              CISCO, status defined, active

Serial0/0.1 (up): ip 192.168.1.4 dlci 104(0x68,0x1880), static,

              broadcast,

              CISCO, status defined, active

 

r2#show frame map

Serial0/0 (up): ip 192.168.1.1 dlci 201(0xC9,0x3090), static,

              broadcast,

              CISCO, status defined, active

 

r3#show frame map

Serial0/0 (up): ip 192.168.1.1 dlci 301(0x12D,0x48D0), static,

              broadcast,

              CISCO, status defined, active

 

r4#show frame map

Serial0/0 (up): ip 192.168.1.1 dlci 401(0x191,0x6410), static,

              broadcast,

              CISCO, status defined, active

 

 

验证结束，试验OK。

 

 

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