OSPF的stub区域

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#OSPF #主干路由 #stub #存根区域

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1、 OSPF的stub区域

a、 stub区域不能学习外部路由，只能通过默认路由

b、在区域内配置：area 区域-id stub

R1配置

en
conf t
hostname R1
 
int loopback 0
ip address 1.1.1.1 255.255.255.0
no shutdown
exit
 
int f0/0
ip address 192.168.1.1 255.255.255.0
no shutdown
exit
 
router ospf 1
network 1.1.1.0 0.0.0.255 area 1
network 192.168.1.0 0.0.0.255 area 1
area 1 stub
exit
end

R2配置

en
conf t
hostname R2
 
int loopback 0
ip address 2.2.2.2 255.255.255.0
no shutdown
exit
 
int f0/0
ip address 192.168.1.2 255.255.255.0
no shutdown
exit
 
int f0/1
ip address 192.168.2.1 255.255.255.0
no shutdown
exit
 
router ospf 1
network 2.2.2.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 1
network 192.168.2.0 0.0.0.255 area 0
area 1 stub
exit
end

R3配置

en
conf t
hostname R3
 
int loopback 0
ip address 3.3.3.3 255.255.255.0
no shutdown
exit
 
int f0/1
ip address 192.168.2.2 255.255.255.0
no shutdown
exit
 
int f0/0
ip address 202.168.1.1 255.255.255.0
no shutdown
exit
 
router ospf 1
network 192.168.2.0 0.0.0.255 area 0
network 3.3.3.0 0.0.0.255 area 0
redistribute static metric-type 1 subnets
exit
 
 
ip route 4.4.4.0 255.255.255.0 f0/0
end

R4配置

en
conf t
hostname R4
 
int f0/0
ip address 202.168.1.2 255.255.255.0
no shutdown
exit
 
int loopback 0
ip address 4.4.4.4 255.255.255.0
no shutdown
exit
 
ip route 0.0.0.0 0.0.0.0 f0/0
end

R1#show ip ospf database

OSPF Router with ID (1.1.1.1) (Process ID 1)

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

1.1.1.1 1.1.1.1 135 0x80000003 0x00500e 2

2.2.2.2 2.2.2.2 135 0x80000002 0x005515 1

Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

192.168.1.2 2.2.2.2 135 0x80000001 0x00741f

Summary Net Link States (Area1)

Link ID ADV Router Age Seq# Checksum

192.168.2.0 2.2.2.2 115 0x80000001 0x008f5b

0.0.0.0 2.2.2.2 115 0x80000002 0x0055ff

2.2.2.2 2.2.2.2 115 0x80000003 0x00f655

3.3.3.3 2.2.2.2 115 0x80000004 0x00d075

R1#show ip route

Codes: C - connected, S - static, I - IGRP,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 - OSPFexternal type 2, E - EGP

i - IS-IS, 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 192.168.1.2 tonetwork 0.0.0.0

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

2.0.0.0/32 is subnetted, 1 subnets

O IA 2.2.2.2 [110/2] via 192.168.1.2, 00:01:52, FastEthernet0/0

3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 [110/3] via 192.168.1.2, 00:01:52, FastEthernet0/0

C 192.168.1.0/24 is directly connected, FastEthernet0/0

O IA 192.168.2.0/24 [110/2] via192.168.1.2, 00:01:52, FastEthernet0/0

O*IA 0.0.0.0/0 [110/2] via 192.168.1.2,00:01:52, FastEthernet0/0

解释：存根区域不能学习外部路由，可以通过默认路由0.0.0.0

R2#show ip ospf database

OSPF Router with ID (2.2.2.2) (Process ID 1)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

2.2.2.2 2.2.2.2 22 0x80000003 0x0057f7 2

3.3.3.3 3.3.3.3 22 0x80000003 0x004af6 2

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

192.168.2.2 3.3.3.3 22 0x80000001 0x007f07

Summary Net Link States (Area0)

Link ID ADV Router Age Seq# Checksum

192.168.1.0 2.2.2.2 17 0x80000001 0x009a51

1.1.1.1 2.2.2.2 17 0x80000002 0x00311f

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

2.2.2.2 2.2.2.2 22 0x80000003 0x005316 1

1.1.1.1 1.1.1.1 22 0x80000003 0x00500e 2

Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

192.168.1.2 2.2.2.2 22 0x80000001 0x00741f

Summary Net Link States (Area1)

Link ID ADV Router Age Seq# Checksum

2.2.2.2 2.2.2.2 17 0x80000001 0x00fa53

R2#show ip route

Codes: C - connected, S - static, I - IGRP,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 - OSPFexternal type 2, E - EGP

i - IS-IS, 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

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 [110/2] via 192.168.1.1, 00:00:20, FastEthernet0/0

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 [110/2] via 192.168.2.2, 00:00:15, FastEthernet0/1

4.0.0.0/24 is subnetted, 1 subnets

O E1 4.4.4.0 [110/21] via 192.168.2.2, 00:00:15, FastEthernet0/1

C 192.168.1.0/24 is directly connected, FastEthernet0/0

C 192.168.2.0/24 is directly connected, FastEthernet0/1

解释：非存根区域能学习外部路由OE1。