帧中继_帧中继交换机

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NBMA实验

实验准备： 1、 四台路由器，R2配置成帧中继交换机。 2、 R1，R3，R4运行OSPF。

实验配置： R1： interface Loopback0 ip address 1.1.1.1 255.255.255.0 ip ospf network point-to-point 使路由正常。 interface Serial0/0 ip address 134.1.1.1 255.255.255.0 encapsulation frame-relay 封装成帧中继。 ip ospf network non-broadcast 配置成NBMA的网络。 ip ospf priority 255 使R1成为DR。接口悠闲级。 frame-relay map ip 134.1.1.3 103 broadcast 用广播方式发送帧中继信息。静态映射。（注意：对方IP和己方DLCI） frame-relay map ip 134.1.1.4 104 broadcast no frame-relay inverse-arp 关闭自动映射。 router ospf 1 log-adjacency-changes network 1.1.1.0 0.0.0.255 area 0 network 134.1.1.0 0.0.0.255 area 0 neighbor 134.1.1.3 priority 3 在NBMA的网络中，只能使用neighbor来指明邻居还可以指明邻居的优先级。 neighbor 134.1.1.4

SWITCH： frame-relay switching 配置成帧中继交换机。此命令很重要。 interface Serial0/0 no ip address encapsulation frame-relay 封装成帧中继 clockrate 128000 frame-relay lmi-type cisco 配置帧中继的类型 frame-relay intf-type dce 配置帧中继为DCE frame-relay route 103 interface Serial0/1 301 做帧中继映射 frame-relay route 104 interface Serial0/2 401 interface Serial0/1 no ip address encapsulation frame-relay clockrate 128000 frame-relay lmi-type cisco frame-relay intf-type dce frame-relay route 301 interface Serial0/0 103 interface Serial0/2 no ip address encapsulation frame-relay clockrate 128000 frame-relay lmi-type cisco frame-relay intf-type dce frame-relay route 401 interface Serial0/0 104

R3： interface Loopback0 ip address 3.3.3.3 255.255.255.0 ip ospf network point-to-point interface Serial0/1 ip address 134.1.1.3 255.255.255.0 encapsulation frame-relay ip ospf network non-broadcast ip ospf priority 3 frame-relay map ip 134.1.1.1 301 broadcast frame-relay map ip 134.1.1.4 301 broadcast no frame-relay inverse-arp router ospf 1 log-adjacency-changes network 3.3.3.0 0.0.0.255 area 0 network 134.1.1.0 0.0.0.255 area 0

R4： interface Loopback0 ip address 4.4.4.4 255.255.255.0 ip ospf network point-to-point interface Serial0/1 ip address 134.1.1.4 255.255.255.0 encapsulation frame-relay ip ospf network non-broadcast ip ospf priority 0 frame-relay map ip 134.1.1.1 401 broadcast frame-relay map ip 134.1.1.3 401 broadcast no frame-relay inverse-arp router ospf 1 log-adjacency-changes network 4.4.4.0 0.0.0.255 area 0 network 134.1.1.0 0.0.0.255 area 0

实验结果： R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 3.3.3.3 3 FULL/BDR 00:01:31 134.1.1.3 Serial0/0 4.4.4.4 0 FULL/DROTHER 00:01:57 134.1.1.4 Serial0/0

R1#show ip route ospf 3.0.0.0/24 is subnetted, 1 subnets O 3.3.3.0 [110/782] via 134.1.1.3, 00:11:56, Serial0/0 4.0.0.0/24 is subnetted, 1 subnets O 4.4.4.0 [110/782] via 134.1.1.4, 00:11:56, Serial0/0

R3：frame-relay map ip 134.1.1.4 301 broadcast R4：frame-relay map ip 134.1.1.3 401 broadcast 以上两条命令的说明： 如果你加这两条命令，在R3上和R4上都能看见带O的路由，如： R3#show ip route ospf 1.0.0.0/24 is subnetted, 1 subnets O 1.1.1.0 [110/782] via 134.1.1.1, 00:00:16, Serial0/1 4.0.0.0/24 is subnetted, 1 subnets O 4.4.4.0 [110/782] via 134.1.1.4, 00:00:16, Serial0/1 R3#ping 4.4.4.4 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds: ….. Success rate is 0 percent (0/5)

R4#show ip route ospf 1.0.0.0/24 is subnetted, 1 subnets O 1.1.1.0 [110/782] via 134.1.1.1, 00:00:35, Serial0/1 3.0.0.0/24 is subnetted, 1 subnets O 3.3.3.0 [110/782] via 134.1.1.3, 00:00:35, Serial0/1 R4#ping 3.3.3.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: ….. Success rate is 0 percent (0/5) 说明即使有路由，但是没有帧中继映射还是不能够通信。

加上这两条命令后： R3#show ip route ospf 1.0.0.0/24 is subnetted, 1 subnets O 1.1.1.0 [110/782] via 134.1.1.1, 00:04:15, Serial0/1 4.0.0.0/24 is subnetted, 1 subnets O 4.4.4.0 [110/782] via 134.1.1.4, 00:04:15, Serial0/1 R3#ping 4.4.4.4 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 56/57/60 ms

R4#show ip route ospf 1.0.0.0/24 is subnetted, 1 subnets O 1.1.1.0 [110/782] via 134.1.1.1, 00:03:57, Serial0/1 3.0.0.0/24 is subnetted, 1 subnets O 3.3.3.0 [110/782] via 134.1.1.3, 00:03:57, Serial0/1 R4#ping 3.3.3.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 56/57/60 ms

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