ospf實驗筆記（三）

ospf實驗分步作（三）

內容：

OSPF實驗8：OSPF Network Type Loopback

OSPF實驗9：OSPF Virtual Links - Repairing Area 0

OSPF實驗8：OSPF Network Type Loopback

Objective: Configure OSPF area 0 . the Ethernet and Loopback0 interfaces of

R1 andR2. The Loopback networks should appear in the routing table with a mask of /8

 

拓撲：（實驗拓撲來自IEWB)

配置參考

R1 e0/0  10.0.0.1/8

R2 e0/0 10.0.0.2/8

R1 Loopback0 1.1.1.1/8

R2 Loopback0 2.2.2.2/8

All interface to area 0

Examine the routing tables or R1 and R2 and note the mask of the OSPF

routes to the Loopback interfaces

Configure the OSPF network type point-to-point . R1 and R2's

Loopback0 interfaces

模擬器ospf8.net配置

# OSPF實驗8：OSPF Network Type Loopback

autostart = False

eghostios = true

sparsemem = True

[localhost]

port = 7200

udp = 11000

workingdir = ..\tmp\

`3640`

image = ..\IOS\unzip-c3640-ik9o3s-mz.124-10.bin

model = 3640

idlepc = 0x605c9218

exec_area = 64

confreg = 0x2142

# mmap = False

ram = 256

slot0 = NM-1E

`router R1`

model = 3640

console = 3001

exec_area = 64

e0/0 = SW 1

`router R2`

console = 3002

model = 3640

exec_area = 64

e0/0 = SW 2

`ethsw SW`

1 = access 1

2 = access 1

配置

Ｒ１上的配置

Ｒ２上的配置

在Ｒ１和Ｒ２上的loopback接口缺省的網絡類型爲都LOOPBACK。接口被視爲“a stub host”

檢查路由表，結果迴環地址被當作一臺主機地址，掩碼位３２，無論迴環接口的掩碼是多少。

下面把Ｒ１和Ｒ２接口的網絡類型都設置成point-to-point。如紅色方框內配置。（這裏列出Ｒ１的配置）。

再檢查路由表如下: 

R1中通過OSPF學習到的路由條目：2.0.0.0/8  ，這裏的掩碼是8位。這是R2路由器loopback0 接口上實際掩碼位。這是因爲你在loopback0接口上配置了OSPF類型爲point-to-point。不再視爲主機地址。

R2中對2.0.0.0/8的解釋與上面類同。

OSPF實驗9：OSPF Virtual Links - Repairing Area 0

Objective: Configure the OSPF domain between R1, R2, R3, R4, and R5 per

the diagram. Ensure that connectivity is maintained between R4 and

R5 if the link between R1 and R2 is down

配置參考

按上圖配置R1, R2, R3, R4, R5的IP地址 。

配置幀中繼封裝R1 s1/0,R2 s1/0，配置 R1 和R2 三層到二層的映射。

配置R1和R4之間 VLAN 4 網段，R2和R5之間的VLAN B，R1和R2之間的幀中繼網段都劃分到OSPF 區域0

R1 ,R2的S1/0 : OSPF network type: point-to-point

配置 R1 & R3 and R2 & R3  爲area 1

用R1  E0/0 ,R2 E0/0 上接口的IP地址分步作爲R1和R2的ospf router-id 

在R1與R2之間area 1內配置OSPF 虛擬鏈路 。

模擬器ospf9.net內容

autostart = False

eghostios = true

sparsemem = True

[localhost]

port = 7200

udp = 11000

workingdir = ..\tmp\

`3640`

image = ..\IOS\unzip-c3640-ik9o3s-mz.124-10.bin

model = 3640

idlepc = 0x605c9218

exec_area = 64

confreg = 0x2142

# mmap = False

ram = 256

slot0 = NM-1E

slot1 = NM-4T

`router R1`

model = 3640

console = 3001

exec_area = 64

e0/0 = SW 1

S1/0 = FR1 1

s1/1 = R3 S1/2

`router R2`

console = 3002

model = 3640

exec_area = 64

e0/0 = SW 3

s1/0 = FR1 2

S1/1 = R3 S1/3

`router R3`

console = 3003

model = 3640

exec_area = 64

`router R4`

console = 3004

model = 3640

exec_area = 64

E0/0 = SW 2

`router R5`

console = 3005

model = 3640

exec_area = 64

E0/0 = SW 4

`ethsw SW`

1 = access 2 #VLAN A

2 = access 2

3 = access 3 #VLAN B

4 = access 3

`FRSW FR1`

1:102 = 2:201

設備配置

R1上的最終配置

R2上的最終配置

R3上的最終配置

R4上的最終配置

R5上的最終配置

檢查路由

沒有配置虛擬鏈路前

用Show ip ospf neighbor 來顯示OSPF 鄰居

檢查各個設備路由情況

這時如果幀中繼鏈路故障，則會出現兩個area 0,在R4上PING不通R5上E0/0的IP地址，在R5上PING不通R4上E0/0的IP。

R1上沒有25.0.0.0/8網絡的路由。

R2上沒有14.0.0.0/8網絡的路由.

R1和R2都屬於ABR，連接area 0 和area 1，虛擬鏈路總是建立在ABR路由器之間。在每一臺ABR路由器的OSPF配置通過area virtual-link命令來配置，指定虛擬鏈路要穿過的區域和這條鏈路遠端的ABR路由器router-id。

配置虛擬鏈路之後 R1和R2路由表中注意標記框類的路由，接口表示：R1 爲OSPV_VL1

R2爲 OSPF_VL2。

虛擬鏈路的類型爲POINT_TO_POINT。