OSPF-hub and spoke配置（一）

实验拓扑图

 

实验过程

1.帧中继交换机的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host FRSW FRSW(config)#frame-relay switching //路由器模拟交换机需要开启帧中继交换功能 FRSW(config)#int s0/0 FRSW(config-if)#no shut FRSW(config-if)#encapsulation frame-relay FRSW(config-if)#frame-relay intf-type dce FRSW(config-if)#frame-relay lmi-type cisco FRSW(config-if)#frame-relay route 102 interface s0/1 201 FRSW(config-if)#frame-relay route 103 interface s0/2 301 FRSW(config-if)#exit FRSW(config)#interface s0/1 FRSW(config-if)#no shut FRSW(config-if)#encapsulation frame-relay FRSW(config-if)#frame-relay intf-type dce FRSW(config-if)#frame-relay lmi-type ciscoFRSW(config-if)#frame FRSW(config-if)#frame-relay route 201 interface s0/0 102 FRSW(config-if)#exit FRSW(config)#interface s0/2 FRSW(config-if)#no shut FRSW(config-if)#encapsulation frame-relay FRSW(config-if)#frame-relay intf-type dce FRSW(config-if)#frame-relay lmi-type cisco FRSW(config-if)#frame-relay route 301 interface s0/0 103 FRSW(config-if)#end

2.R1的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R1 R1(config)#interface lo0 R1(config-if)#ip add 1.1.1.1 255.255.255.0 R1(config)#interface s0/0 R1(config-if)#no shut R1(config-if)#encapsulation frame-relay R1(config-if)#no frame-relay inverse-arp R1(config-if)#ip add 192.168.0.1 255.255.255.0 R1(config-if)#frame-relay map ip 192.168.0.2 102 broadcast R1(config-if)#frame-relay map ip 192.168.0.3 103 broadcast R1(config-if)#end

3.R2的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R2 R2(config)#interface lo0 R2(config-if)#ip add 2.2.2.2 255.255.255.0 R2(config)#interface s0/1 R2(config-if)#no shut R2(config-if)#encapsulation frame-relay R2(config-if)#no frame-relay inverse-arp R2(config-if)#ip add 192.168.0.2 255.255.255.0 R2(config-if)#frame-relay map ip 192.168.0.1 201 broadcast R2(config-if)#frame-relay map ip 192.168.0.3 201 broadcast R2(config-if)#end

4.R3的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R3 R3(config-if)#ip add 3.3.3.3 255.255.255.0 R3(config)#interface s0/2 R3(config-if)#no shut R3(config-if)#encapsulation frame-relay R3(config-if)#no frame-relay inverse-arp R3(config-if)#ip add 192.168.0.3 255.255.255.0 R3(config-if)#frame-relay map ip 192.168.0.1 301 broadcast R3(config-if)#frame-relay map ip 192.168.0.2 301 broadcast R3(config-if)#end

5.测试R1，R2和R3的连通性

R1#ping 192.168.0.2   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.0.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 16/40/88 ms R1#ping 192.168.0.3   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.0.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 48/75/96 ms

R2#ping 192.168.0.1   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.0.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/55/92 ms R2#ping 192.168.0.3   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.0.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 64/104/172 ms

 

6.配置R1的OSPF

R1(config)#router ospf 1 R1(config-router)#network 1.1.1.1 0.0.0.0 area 0  //宣告直连的网段 R1(config-router)#network 192.168.0.1 0.0.0.0 area 0 R1(config-router)#neighbor 192.168.0.2  //NBMA网络需要手动指定邻居 R1(config-router)#neighbor 192.168.0.3 R1(config-router)#end

7.配置R2的OSPF

R2(config)#interface s0/1 R2(config-if)#ip ospf priority 0  //把s0/1接口优先级改为0，使接口不参与DR，BDR选举 R2(config-if)#exit R2(config)#router ospf 1 R2(config-router)#network 2.2.2.2 0.0.0.0 area 0 R2(config-router)#network 192.168.0.2 0.0.0.0 area 0 R2(config-router)#end

8.配置R3的OSPF

R3(config)#interface s0/2 R3(config-if)#ip ospf priority 0 R3(config-if)#exit R3(config)#router ospf 1 R3(config-router)#network 3.3.3.3 0.0.0.0 area 0 R3(config-router)#network 192.168.0.3 0.0.0.0 area 0 R3(config-router)#end

9.查看OSPF邻居表

R1#show ip ospf nei   Neighbor ID     Pri   State           Dead Time   Address         Interface 2.2.2.2           0   FULL/DROTHER    00:01:47    192.168.0.2     Serial0/0 3.3.3.3           0   FULL/DROTHER    00:01:59    192.168.0.3     Serial0/0

说明：由于R2和R3的接口优先级都是0，不参与DR选举，因此R1自然成为DR。

R2#show ip ospf nei   Neighbor ID     Pri   State           Dead Time   Address         Interface 192.168.0.1       1   FULL/DR         00:01:30    192.168.0.1     Serial0/1

R3#show ip ospf nei   Neighbor ID     Pri   State           Dead Time   Address         Interface 192.168.0.1       1   FULL/DR         00:01:36    192.168.0.1     Serial0/2

 

10.查看OSPF协议信息

R1#show ip ospf interface Serial0/0 is up, line protocol is up   Internet Address 192.168.0.1/24, Area 0   Process ID 1, Router ID 192.168.0.1, Network Type NON_BROADCAST, Cost: 64   Transmit Delay is 1 sec, State DR, Priority 1   Designated Router (ID) 192.168.0.1, Interface address 192.168.0.1   No backup designated router on this network  //没有BDR   Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5     oob-resync timeout 120     Hello due in 00:00:28   Supports Link-local Signaling (LLS)   Index 2/2, flood queue length 0   Next 0x0(0)/0x0(0)   Last flood scan length is 1, maximum is 1   Last flood scan time is 0 msec, maximum is 4 msec   Neighbor Count is 2, Adjacent neighbor count is 2     Adjacent with neighbor 2.2.2.2     Adjacent with neighbor 3.3.3.3   Suppress hello for 0 neighbor(s) Loopback0 is up, line protocol is up   Internet Address 1.1.1.1/24, Area 0   Process ID 1, Router ID 192.168.0.1, Network Type LOOPBACK, Cost: 1

11.查看R1的OSPF路由表

R1#show ip route ospf      2.0.0.0/32 is subnetted, 1 subnets O       2.2.2.2 [110/65] via 192.168.0.2, 00:10:26, Serial0/0      3.0.0.0/32 is subnetted, 1 subnets O       3.3.3.3 [110/65] via 192.168.0.3, 00:10:26, Serial0/0

R2#show ip route ospf      1.0.0.0/32 is subnetted, 1 subnets O       1.1.1.1 [110/65] via 192.168.0.1, 00:09:51, Serial0/1      3.0.0.0/32 is subnetted, 1 subnets O       3.3.3.3 [110/65] via 192.168.0.3, 00:09:51, Serial0/1

12.测试连通性

R1#ping 2.2.2.2 source lo0   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds: Packet sent with a source address of 1.1.1.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 28/60/96 ms R1#ping 3.3.3.3 source lo0   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: Packet sent with a source address of 1.1.1.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 12/42/80 ms

R2#ping 1.1.1.1 source lo0   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: Packet sent with a source address of 2.2.2.2 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 20/50/72 ms R2#ping 3.3.3.3 source lo0   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: Packet sent with a source address of 2.2.2.2 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 40/109/180 ms

说明：在NBMA类型的网络中配置OSPF必须手动指定邻居，但是前提是必须保证每个路由器都互通。