小弟初次发帖,诸多缺陷,水平不高,望请指教！-------------------------------------------------------------------------------------------------------------
同一台路由器运行多个OSPF现象浅析（同区域隔离）


拓扑图：(均为 AREA 0 )






















实验目的：
<1> 验证 在同一区域可以采用在同一路由运行不同OSPF进程进行隔离，也就是说：
虽然R1、R2、R3都在区域0内，但由于R2上运行不同的OSPF进程，有着不同的Database，所以R1和R2无法通信（收不到对方路由）；
<2> 附属验证 在R2上不同OSPF进程进行会自动选择不同的Router-ID。

实验配置：（基本配置省略，只留下OSPF相关配置）
R1
router ospf 100

log-adjacency-changes

network 1.1.1.1 0.0.0.0 area 0

network 10.0.0.0 0.0.0.255 area 0
R2（关键）
router ospf 100

log-adjacency-changes

network 10.0.0.0 0.0.0.255 area 0
!
router ospf 101

log-adjacency-changes

network 2.2.2.2 0.0.0.0 area 0

network 20.0.0.0 0.0.0.255 area 0
R3
router ospf 100

log-adjacency-changes

network 3.3.3.3 0.0.0.0 area 0

network 20.0.0.0 0.0.0.255 area 0

实验结果验证：
<1> 验证 在同一区域可以采用在同一路由运行不同OSPF进程进行隔离
R1#sh ip rou
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


1.0.0.0/24 is subnetted, 1 subnets
C
1.1.1.0 is directly connected, Loopback0

10.0.0.0/24 is subnetted, 1 subnets
C
10.0.0.0 is directly connected, Serial1/0
（收不到R3的路由信息）
但是数据库中仍然可以看到本区域的主机：
R1#sh ip os da



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
1003
0x80000008 0x00E570 3
3.3.3.3
3.3.3.3
3212
0x8000000B 0x007BA8 3
20.0.0.2
20.0.0.2
667
0x80000005 0x00CF8A 2





下面是R2的路由表（全路由）
R2#sh ip rou
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


1.0.0.0/24 is subnetted, 1 subnets
O
1.1.1.0 [110/65] via 10.0.0.1, 00:02:23, Serial1/0

2.0.0.0/24 is subnetted, 1 subnets
C
2.2.2.0 is directly connected, Loopback0

3.0.0.0/32 is subnetted, 1 subnets
O
3.3.3.3 [110/65] via 20.0.0.3, 00:01:51, Serial1/1

20.0.0.0/24 is subnetted, 1 subnets
C
20.0.0.0 is directly connected, Serial1/1

10.0.0.0/24 is subnetted, 1 subnets
C
10.0.0.0 is directly connected, Serial1/0!
在R2的数据库中可以很明白看出来结构：
R2#sh ip os da


OSPF Router with ID (2.2.2.2) (Process ID 101)


Router Link States (Area 0)

Link ID
ADV Router
Age
Seq#
Checksum Link count
2.2.2.2
2.2.2.2
328
0x80000003 0x00D470 3
3.3.3.3
3.3.3.3
333
0x80000017 0x005EC7 3
20.0.0.2
20.0.0.2
3297
0x8000000E 0x00F36F 5


OSPF Router with ID (20.0.0.2) (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
1095
0x80000008 0x00E570 3
3.3.3.3
3.3.3.3
3303
0x8000000B 0x007BA8 3
20.0.0.2
20.0.0.2
757
0x80000005 0x00CF8A 2


R3#sh ip rou
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


2.0.0.0/24 is subnetted, 1 subnets
O
2.2.2.0 [110/65] via 20.0.0.2, 00:02:21, Serial1/0

3.0.0.0/24 is subnetted, 1 subnets
C
3.3.3.0 is directly connected, Loopback0

20.0.0.0/24 is subnetted, 1 subnets
C
20.0.0.0 is directly connected, Serial1/0
R3的数据库:
R3#sh ip os da


OSPF Router with ID (3.3.3.3) (Process ID 100)


Router Link States (Area 0)

Link ID
ADV Router
Age
Seq#
Checksum Link count
2.2.2.2
2.2.2.2
471
0x80000003 0x00D470 3
3.3.3.3
3.3.3.3
474
0x80000017 0x005EC7 3
20.0.0.2
20.0.0.2
3438
0x8000000E 0x00F36F 5


验证2 附属验证 在R2上不同OSPF进程进行会自动选择不同的Router-ID
（在R2上）
R2#sh ip os

Routing Process "ospf 101" with ID 2.2.2.2

Supports only single TOS(TOS0) routes

Supports opaque LSA

Supports Link-local Signaling (LLS)

Initial SPF schedule delay 5000 msecs
(中间省略)

Routing Process "ospf 100" with ID 20.0.0.2

Supports only single TOS(TOS0) routes

Supports opaque LSA

Supports Link-local Signaling (LLS)

Initial SPF schedule delay 5000 msecs

Minimum hold time between two consecutive SPFs 10000 msecs

Maximum wait time between two consecutive SPFs 10000 msecs
（后面省略）
红色标记的地方说明：环回口优先级最高，决定Router-ID，但当运行多个OSPF进程的时候，路由会选择其他接口作为不同的Router-ID,以在不同的网络区域里区分路由

小弟水平已经不错了,你发的我都看不懂呢