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实验预备知识:
NSSA,Not-so-stubby Area,非完全末梢区域
LSA的类型:
1型:路由器LSA(Router LSA)
2型:网络LSA(Network LSA)
3型:网络汇总LSA(Network Summary LSA)
4型:ASBR汇总LSA(ASBR Summary LSA)
5型:自治系统外部LSA(AS External LSA)
7型:NSSA外部LSA(NSSA External LSA)
实验预配置:
第一步 R1的预配置
R1(config)#int lo0
R1(config-if)#ip add 1.1.1.1 255.255.255.0
R1(config-if)#int s2/1
R1(config-if)#ip add 12.0.0.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#int s2/2
R1(config-if)#ip add 15.0.0.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#exit
第二步 R2的预配置
R2(config)#int lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.0
R2(config-if)#int s2/1
R2(config-if)#ip add 12.0.0.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int s2/2
R2(config-if)#ip add 23.0.0.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#exit
第三步 R3的预配置
R3(config)#int lo0
R3(config-if)#ip add 3.3.3.3 255.255.255.0
R3(config-if)#int s2/1
R3(config-if)#ip add 23.0.0.3 255.255.255.0
R3(config-if)#no sh
R3(config-if)#exit
第四步 R4的预配置
R4(config)#int lo0
R4(config-if)#ip add 4.4.4.4 255.255.255.0
R4(config-if)#int s2/2
R4(config-if)#ip add 45.0.0.4 255.255.255.0
R4(config-if)#no sh
R4(config-if)#exit
第五步 R5的预配置
R5(config)#int lo0
R5(config-if)#ip add 5.5.5.5 255.255.255.0
R5(config-if)#int s2/1
R5(config-if)#ip add 15.0.0.5 255.255.255.0
R5(config-if)#no sh
R5(config-if)#int s2/2
R5(config-if)#ip add 45.0.0.5 255.255.255.0
R5(config-if)#no sh
实验配置过程:
第一步 配置R1、R2、R3、R4、R5的OSPF协议
R1(config)#router ospf 100
R1(config-router)#router-id 1.1.1.1
R1(config-router)#network 1.1.1.1 0.0.0.0 area 0
R1(config-router)#network 12.0.0.1 0.0.0.0 area 0
R1(config-router)#network 15.0.0.1 0.0.0.0 area 0
R1(config-router)#exit
R2(config)#router ospf 100
R2(config-router)#router-id 2.2.2.2
R2(config-router)#network 2.2.2.2 0.0.0.0 area 0
R2(config-router)#network 12.0.0.2 0.0.0.0 area 0
R2(config-router)#network 23.0.0.2 0.0.0.0 area 32
R2(config-router)#exit
R3(config)#router ospf 100
R3(config-router)#router-id 3.3.3.3
R3(config-router)#network 3.3.3.3 0.0.0.0 area 32
R3(config-router)#network 23.0.0.3 0.0.0.0 area 32
R3(config-router)#exit
R4(config)#router ospf 100
R4(config-router)#router-id 4.4.4.4
R4(config-router)#network 4.4.4.4 0.0.0.0 area 54
R4(config-router)#network 45.0.0.4 0.0.0.0 area 54
R4(config-router)#exit
R5(config)#router ospf 100
R5(config-router)#network 5.5.5.5 0.0.0.0 area 0
R5(config-router)#network 15.0.0.5 0.0.0.0 area 0
R5(config-router)#network 45.0.0.5 0.0.0.0 area 54
R5(config-router)#exit
第二步 配置Area 32为NSSA区域
R2(config)#router ospf 100
R2(config-router)#area 32 nssa
R2(config-router)#exit
R3(config)#router ospf 100
R3(config-router)#area 32 nssa
R3(config-router)#exit
第三步 到R3上配置重分布
R3(config)#int lo11
R3(config-if)#ip ad 199.172.1.1 255.255.255.0
R3(config-if)#int lo12
R3(config-if)#ip ad 199.172.2.2 255.255.255.0
R3(config-if)#int lo13
R3(config-if)#ip ad 199.172.3.3 255.255.255.0
R3(config-if)#int lo14
R3(config-if)#ip ad 199.172.4.4 255.255.255.0
R3(config-if)#int lo15
R3(config-if)#ip ad 199.172.5.5 255.255.255.0
R3(config-if)#int lo16
R3(config-if)#ip ad 199.172.6.6 255.255.255.0
R3(config-if)#int lo17
R3(config-if)#ip ad 199.172.7.7 255.255.255.0
R3(config-if)#int lo18
R3(config-if)#ip ad 199.172.8.8 255.255.255.0
R3(config-if)#int lo19
R3(config-if)#ip ad 199.172.9.9 255.255.255.0
R3(config-if)#int lo20
R3(config-if)#ip ad 199.172.10.10 255.255.255.0
R3(config-if)#int lo21
R3(config-if)#ip ad 199.172.11.11 255.255.255.0
R3(config-if)#int lo22
R3(config-if)#ip ad 199.172.12.12 255.255.255.0
R3(config-if)#int lo23
R3(config-if)#ip ad 199.172.13.13 255.255.255.0
R3(config-if)#int lo24
R3(config-if)#ip ad 199.172.14.14 255.255.255.0
R3(config-if)#int lo25
R3(config-if)#ip ad 199.172.15.15 255.255.255.0
R3(config-if)#exit
R3(config)#router ospf 100
R3(config-router)#redistribute connected subnets
R3(config-router)#^Z
第四步 查看R3的OSPF数据库
R3#show ip ospf database
OSPF Router with ID (3.3.3.3) (Process ID 100)
Router Link States (Area 32)
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 146 0x80000006 0x0089C0 2
3.3.3.3 3.3.3.3 31 0x80000004 0x006FBB 3
Summary Net Link States (Area 32)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 2.2.2.2 162 0x80000002 0x004F99
2.2.2.2 2.2.2.2 162 0x80000002 0x009E86
4.4.4.4 2.2.2.2 162 0x80000002 0x00C992
5.5.5.5 2.2.2.2 162 0x80000002 0x00197F
12.0.0.0 2.2.2.2 162 0x80000002 0x00D60B
15.0.0.0 2.2.2.2 162 0x80000002 0x00326C
45.0.0.0 2.2.2.2 162 0x80000002 0x002D13
Type-7 AS External Link States (Area 32)
//可以看到,R3上重发布的路由成了LSA-7型
Link ID ADV Router Age Seq# Checksum Tag
199.172.1.0 3.3.3.3 30 0x80000001 0x0047C1 0
199.172.2.0 3.3.3.3 31 0x80000001 0x003CCB 0
199.172.3.0 3.3.3.3 31 0x80000001 0x0031D5 0
199.172.4.0 3.3.3.3 31 0x80000001 0x0026DF 0
199.172.5.0 3.3.3.3 31 0x80000001 0x001BE9 0
199.172.6.0 3.3.3.3 32 0x80000001 0x0010F3 0
199.172.7.0 3.3.3.3 32 0x80000001 0x0005FD 0
199.172.8.0 3.3.3.3 32 0x80000001 0x00F908 0
199.172.9.0 3.3.3.3 32 0x80000001 0x00EE12 0
199.172.10.0 3.3.3.3 32 0x80000001 0x00E31C 0
199.172.11.0 3.3.3.3 32 0x80000001 0x00D826 0
199.172.12.0 3.3.3.3 32 0x80000001 0x00CD30 0
199.172.13.0 3.3.3.3 32 0x80000001 0x00C23A 0
199.172.14.0 3.3.3.3 32 0x80000001 0x00B744 0
199.172.15.0 3.3.3.3 32 0x80000001 0x00AC4E 0
第五步 查看R2的路由表与数据库
R2#show 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
O N2 199.172.11.0/24 [110/20] via 23.0.0.3, 00:02:15, Serial2/2
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/65] via 12.0.0.1, 00:04:26, Serial2/1
O N2 199.172.10.0/24 [110/20] via 23.0.0.3, 00:02:15, Serial2/2
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
O N2 199.172.9.0/24 [110/20] via 23.0.0.3, 00:02:15, Serial2/2
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/65] via 23.0.0.3, 00:02:15, Serial2/2
O N2 199.172.8.0/24 [110/20] via 23.0.0.3, 00:02:15, Serial2/2
O N2 199.172.15.0/24 [110/20] via 23.0.0.3, 00:02:15, Serial2/2
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.4 [110/193] via 12.0.0.1, 00:02:15, Serial2/1
O N2 199.172.14.0/24 [110/20] via 23.0.0.3, 00:02:15, Serial2/2
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/129] via 12.0.0.1, 00:04:27, Serial2/1
O N2 199.172.13.0/24 [110/20] via 23.0.0.3, 00:02:16, Serial2/2
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/2
O N2 199.172.12.0/24 [110/20] via 23.0.0.3, 00:02:16, Serial2/2
O N2 199.172.3.0/24 [110/20] via 23.0.0.3, 00:02:16, Serial2/2
O N2 199.172.2.0/24 [110/20] via 23.0.0.3, 00:02:16, Serial2/2
O N2 199.172.1.0/24 [110/20] via 23.0.0.3, 00:02:16, Serial2/2
O N2 199.172.7.0/24 [110/20] via 23.0.0.3, 00:02:16, Serial2/2
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial2/1
O N2 199.172.6.0/24 [110/20] via 23.0.0.3, 00:02:17, Serial2/2
O N2 199.172.5.0/24 [110/20] via 23.0.0.3, 00:02:17, Serial2/2
O N2 199.172.4.0/24 [110/20] via 23.0.0.3, 00:02:17, Serial2/2
45.0.0.0/24 is subnetted, 1 subnets
O IA 45.0.0.0 [110/192] via 12.0.0.1, 00:02:17, Serial2/1
15.0.0.0/24 is subnetted, 1 subnets
O 15.0.0.0 [110/128] via 12.0.0.1, 00:04:28, Serial2/1
R2#
R2#show ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 100)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 372 0x80000005 0x005B35 5
2.2.2.2 2.2.2.2 305 0x80000004 0x001B3C 3
5.5.5.5 5.5.5.5 368 0x80000002 0x0040ED 3
Summary Net Link States (Area 0)
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