Cisco之OSPF

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    OSPF网络架构如下:

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R1的配置:

R1(config)#router ospf 100

R1(config-router)#router-id 1.1.1.1

R1(config-router)#network 10.1.1.0 0.0.0.3 area 0

R1(config-router)#network 10.1.1.4 0.0.0.3 area 1


R2的配置:

R2(config)#router ospf 100

R2(config-router)#router-id 2.2.2.2

R2(config-router)#network 10.1.1.8 0.0.0.3 area 0

R2(config-router)#network 10.1.1.12 0.0.0.3 area 1


R3的配置:

R3(config)#router ospf 100

R3(config-router)#router-id 3.3.3.3

R3(config-router)#network 10.1.1.0 0.0.0.3 area 0

R3(config-router)#network 10.1.1.8 0.0.0.3 area 0

R3(config-router)#network 192.168.1.0 0.0.0.255 area 0


R4的配置:

R4(config)#router ospf 100

R4(config-router)#router-id 4.4.4.4

R4(config-router)#network 10.1.1.4 0.0.0.3 area 1

R4(config-router)#network 10.1.1.12 0.0.0.3 area 1

R4(config-router)#network 172.16.1.0 0.0.0.255 area 1


显示路由器的路由协议信息:

R1#sh ip protocols 

Routing Protocol is "ospf 100"

  Outgoing update filter list for all interfaces is not set

  Incoming update filter list for all interfaces is not set

  Router ID 1.1.1.1

  It is an area border router

  Number of areas in this router is 2. 2 normal 0 stub 0 nssa

  Maximum path: 4

  Routing for Networks:

    10.1.1.0 0.0.0.3 area 0

    10.1.1.4 0.0.0.3 area 1

 Reference bandwidth unit is 100 mbps

  Routing Information Sources:

    Gateway         Distance      Last Update

    4.4.4.4              110      00:14:48

    2.2.2.2              110      00:14:48

    3.3.3.3              110      00:17:19

  Distance: (default is 110)


查看路由表:

R1#sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route


Gateway of last resort is not set


     172.16.0.0/32 is subnetted, 1 subnets

O       172.16.1.1 [110/2] via 10.1.1.6, 00:03:55, FastEthernet1/0

     10.0.0.0/30 is subnetted, 4 subnets

O       10.1.1.8 [110/2] via 10.1.1.1, 00:06:26, FastEthernet0/0

O       10.1.1.12 [110/2] via 10.1.1.6, 00:03:55, FastEthernet1/0

C       10.1.1.0 is directly connected, FastEthernet0/0

C       10.1.1.4 is directly connected, FastEthernet1/0

     192.168.1.0/32 is subnetted, 1 subnets

O       192.168.1.1 [110/2] via 10.1.1.1, 00:06:26, FastEthernet0/0


仅显示与OSPF相关的路由信息:

R1#sh ip route ospf

     172.16.0.0/32 is subnetted, 1 subnets

O       172.16.1.1 [110/2] via 10.1.1.6, 00:17:27, FastEthernet1/0

     10.0.0.0/30 is subnetted, 4 subnets

O       10.1.1.8 [110/2] via 10.1.1.1, 00:19:58, FastEthernet0/0

O       10.1.1.12 [110/2] via 10.1.1.6, 00:17:27, FastEthernet1/0

     192.168.1.0/32 is subnetted, 1 subnets

O       192.168.1.1 [110/2] via 10.1.1.1, 00:19:58, FastEthernet0/0


验证网络是否畅通:

R3#ping 172.16.1.1 source 192.168.1.1


Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:

Packet sent with a source address of 192.168.1.1 

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 52/66/76 ms


查看邻接关系:

R1#sh ip ospf neighbor 


Neighbor ID     Pri   State           Dead Time   Address         Interface

3.3.3.3           1   FULL/BDR        00:00:34    10.1.1.1        FastEthernet0/0

4.4.4.4           1   FULL/BDR        00:00:32    10.1.1.6        FastEthernet1/0


R3#sh ip ospf neighbor 


Neighbor ID     Pri   State           Dead Time   Address         Interface

2.2.2.2           1   FULL/DR         00:00:33    10.1.1.10       FastEthernet1/0

1.1.1.1           1   FULL/DR         00:00:35    10.1.1.2        FastEthernet0/0


查看接口是否加入正确的区域:

R1#sh ip ospf interface 

FastEthernet0/0 is up, line protocol is up 

  Internet Address 10.1.1.2/30, Area 0 

  Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1

  Transmit Delay is 1 sec, State DR, Priority 1 

  Designated Router (ID) 1.1.1.1, Interface address 10.1.1.2

  Backup Designated router (ID) 3.3.3.3, Interface address 10.1.1.1

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:07

  Supports Link-local Signaling (LLS)

  Index 1/1, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 0, maximum is 1

  Last flood scan time is 0 msec, maximum is 4 msec

  Neighbor Count is 1, Adjacent neighbor count is 1 

    Adjacent with neighbor 3.3.3.3  (Backup Designated Router)

  Suppress hello for 0 neighbor(s)

FastEthernet1/0 is up, line protocol is up 

  Internet Address 10.1.1.5/30, Area 1 

  Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1

  Transmit Delay is 1 sec, State DR, Priority 1 

  Designated Router (ID) 1.1.1.1, Interface address 10.1.1.5

  Backup Designated router (ID) 4.4.4.4, Interface address 10.1.1.6

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:06

  Supports Link-local Signaling (LLS)

  Index 1/2, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 0, maximum is 1

  Last flood scan time is 0 msec, maximum is 0 msec

  Neighbor Count is 1, Adjacent neighbor count is 1 

    Adjacent with neighbor 4.4.4.4  (Backup Designated Router)

  Suppress hello for 0 neighbor(s)


查看OSPF数据库:

R1#sh ip ospf database 


            OSPF Router with ID (1.1.1.1) (Process ID 100)


Router Link States (Area 0)


Link ID         ADV Router      Age         Seq#       Checksum Link count

1.1.1.1         1.1.1.1         1390        0x80000003 0x00AD5E 1

2.2.2.2         2.2.2.2         1373        0x80000003 0x0022D1 1

3.3.3.3         3.3.3.3         1367        0x80000005 0x00083C 3


Net Link States (Area 0)


Link ID         ADV Router      Age         Seq#       Checksum

10.1.1.2        1.1.1.1         1390        0x80000001 0x007AA0

10.1.1.10       2.2.2.2         1374        0x80000001 0x002EDC


Summary Net Link States (Area 0)


Link ID         ADV Router      Age         Seq#       Checksum

10.1.1.4        1.1.1.1         1749        0x80000001 0x00A189

10.1.1.4        2.2.2.2         1218        0x80000001 0x008D98

10.1.1.12       1.1.1.1         1225        0x80000001 0x005BC6

10.1.1.12       2.2.2.2         1507        0x80000001 0x0033EB



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