多区域OSPF实验一：详解LSA
2010-12-10 07:56
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一、拓扑图
二、实验目的
1.观察各类LSA的内容通告ID以及链路ID分别是什么
2.各类LSA由谁发出的，作用是什么
3.抓包查看hello包的内容
三、实验步骤
启动R3-R8，配置IP地址并按区域运行ospf 110
1.抓包看hello包的内容
通过抓包看到Hello包的内容包括：Ospf的版本号v2，发送Hello包的路由器的Route-ID，区域ID，认证类型，子网掩码，Hello/dead时间，接口优先级，DR/BDR的接口地址，邻居的RID，应该还有Stub是否存在，因为没有配置Stub区域，此包未发现Stub置位。（可能观察有问题）
2.Lsa的总结，详细结果请看下面的Show命令的输出
1.LSA1，由所有运行OSPF的路由器发出，链路ID和通告路由器都为路由器的Router-id
内容包括：连接的网络号，掩码，邻居的RID以及DR的接口地址，连接某一区域的本地接口IP地址
R3#show ip ospf database router
OSPF Router with ID (3.3.3.3) (Process ID 110)
Router Link States (Area 0)
LS age: 1083
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000003
Checksum: 0x1092
Length: 48
Area Border Router
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 34.1.1.4
(Link Data) Router Interface address: 34.1.1.3
Number of TOS metrics: 0
TOS 0 Metrics: 10
Link connected to: a Stub Network
(Link ID) Network/subnet number: 3.3.3.3
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Routing Bit Set on this LSA
LS age: 1084
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 4.4.4.4
Advertising Router: 4.4.4.4
LS Seq Number: 80000004
Checksum: 0x850F
Length: 48
Area Border Router
Number of Links: 2
Link connected to: a Stub Network
(Link ID) Network/subnet number: 4.4.4.4
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Transit Network
(Link ID) Designated Router address: 34.1.1.4
(Link Data) Router Interface address: 34.1.1.4
Number of TOS metrics: 0
TOS 0 Metrics: 10
Router Link States (Area 1)
LS age: 1094
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000002
Checksum: 0x9791
Length: 48
Area Border Router
Number of Links: 2
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 5.5.5.5
(Link Data) Router Interface address: 35.1.1.3
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 35.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
LS age: 1091
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 5.5.5.5
Advertising Router: 5.5.5.5
LS Seq Number: 80000003
Checksum: 0x1CDD
Length: 60
Number of Links: 3
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 3.3.3.3
(Link Data) Router Interface address: 35.1.1.5
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 35.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 5.5.5.5
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Router Link States (Area 2)
LS age: 929
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000002
Checksum: 0xD74B
Length: 48
Area Border Router
Number of Links: 2
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 6.6.6.6
(Link Data) Router Interface address: 36.1.1.3
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 36.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
LS age: 930
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 6.6.6.6
Advertising Router: 6.6.6.6
LS Seq Number: 80000005
Checksum: 0xF28C
Length: 96
Number of Links: 6
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 3.3.3.3
(Link Data) Router Interface address: 36.1.1.6
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 36.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.3.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.2.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.1.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.0.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
2.LSA2：由DR发出的，只有在MA网络中才存在。LINK State ID为DR的接口IP地址，通告路由器ID为DR的RID
内容包括这条链路上所有邻居的RID
R3#show ip ospf database network
OSPF Router with ID (3.3.3.3) (Process ID 110)
Net Link States (Area 0)
Routing Bit Set on this LSA
LS age: 1349
Options: (No TOS-capability, DC)
LS Type: Network Links
Link State ID: 34.1.1.4 (address of Designated Router)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x4B9A
Length: 32
Network Mask: /24
Attached Router: 4.4.4.4
Attached Router: 3.3.3.3
3.LSA3 summary：链路ID为某一网络前缀，通告ID为ABR的RID，作用是一条路由的网络前缀，由ABR发送出来的，用来通告一条路由
R3#show ip ospf database summary
OSPF Router with ID (3.3.3.3) (Process ID 110)
Summary Net Link States (Area 0)
LS age: 1495
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 5.5.5.5 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD407
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.0.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE8F4
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.1.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDDFE
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.2.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD209
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.3.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC713
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
Routing Bit Set on this LSA
LS age: 1423
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 7.7.7.7 (summary Network Number)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x5A75
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1578
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 35.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD1F9
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
LS age: 1568
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 36.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC406
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
Routing Bit Set on this LSA
LS age: 1544
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 47.1.1.0 (summary Network Number)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x17A4
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
Summary Net Link States (Area 1)
LS age: 1583
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 3.3.3.3 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xAE75
Length: 28
Network Mask: /32
TOS: 0 Metric: 1
LS age: 1507
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 4.4.4.4 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE431
Length: 28
Network Mask: /32
TOS: 0 Metric: 11
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.0.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE8F4
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.1.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDDFE
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.2.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD209
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.3.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC713
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1423
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 7.7.7.7 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDCEC
Length: 28
Network Mask: /32
TOS: 0 Metric: 75
LS age: 1512
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 34.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000003
Checksum: 0xBC44
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
LS age: 1569
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 36.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC406
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
LS age: 1507
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 47.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x991C
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
Summary Net Link States (Area 2)
LS age: 1569
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 3.3.3.3 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xAE75
Length: 28
Network Mask: /32
TOS: 0 Metric: 1
LS age: 1507
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 4.4.4.4 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE431
Length: 28
Network Mask: /32
TOS: 0 Metric: 11
LS age: 1498
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 5.5.5.5 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD407
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1424
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 7.7.7.7 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDCEC
Length: 28
Network Mask: /32
TOS: 0 Metric: 75
LS age: 1513
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 34.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000003
Checksum: 0xBC44
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
LS age: 1569
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 35.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD1F9
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
LS age: 1508
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 47.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x991C
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
4.LSA4：需要将R7和R8之间的RIP网络启用，并重分布RIP到OSPF110
在ASBR上做重分布，在OSPF进程下
redistribute rip subnets
R5# 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
34.0.0.0/24 is subnetted, 1 subnets
O IA 34.1.1.0 [110/74] via 35.1.1.3, 00:31:20, Serial0/1
35.0.0.0/24 is subnetted, 1 subnets
C 35.1.1.0 is directly connected, Serial0/1
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/65] via 35.1.1.3, 00:31:20, Serial0/1
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.4 [110/75] via 35.1.1.3, 00:31:20, Serial0/1
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
36.0.0.0/24 is subnetted, 1 subnets
O IA 36.1.1.0 [110/128] via 35.1.1.3, 00:31:20, Serial0/1
6.0.0.0/32 is subnetted, 4 subnets
O IA 6.6.2.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
O IA 6.6.3.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
O IA 6.6.0.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
O IA 6.6.1.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.7 [110/139] via 35.1.1.3, 00:30:15, Serial0/1
8.0.0.0/24 is subnetted, 4 subnets
O E2 8.8.0.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
O E2 8.8.1.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
O E2 8.8.2.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
O E2 8.8.3.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
78.0.0.0/24 is subnetted, 1 subnets
O E2 78.1.1.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
47.0.0.0/24 is subnetted, 1 subnets
O IA 47.1.1.0 [110/138] via 35.1.1.3, 00:31:20, Serial0/
4.：LSA4 由ABR发送的，告诉路由器到达ASBR的RID，链路ID是ASBR的RID 通告路由器是ABR的RID
R3# show ip ospf database asbr-summary
OSPF Router with ID (3.3.3.3) (Process ID 110)
Summary ASB Link States (Area 0)
Routing Bit Set on this LSA
LS age: 105
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 7.7.7.7 (AS Boundary Router address)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x428D
Length: 28
Network Mask: /0
TOS: 0 Metric: 64
Summary ASB Link States (Area 1)
LS age: 104
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 7.7.7.7 (AS Boundary Router address)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC405
Length: 28
Network Mask: /0
TOS: 0 Metric: 74
Summary ASB Link States (Area 2)
LS age: 105
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 7.7.7.7 (AS Boundary Router address)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC405
Length: 28
Network Mask: /0
TOS: 0 Metric: 74
LSA5：由ASBR发送的，作用是一条外部路由的网络号/掩 码，链路ID是外部路由的网络号，通告路由器是ASBR的RID
R3#show ip ospf database external
OSPF Router with ID (3.3.3.3) (Process ID 110)
Type-5 AS External Link States
Routing Bit Set on this LSA
LS age: 237
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.0.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x4C28
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 237
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x4132
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 238
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.2.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x363C
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 238
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.3.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x2B46
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 238
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 78.1.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x430
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
LSA7：
将Area 3配置成NSSA区域
链路ID是外部路由的网络号，通告路由器是ASBR的RID
R4#show ip ospf database nssa-external
OSPF Router with ID (4.4.4.4) (Process ID 110)
Type-7 AS External Link States (Area 3)
Routing Bit Set on this LSA
LS age: 56
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.0.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x1737
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 56
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0xC41
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 57
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.2.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x14B
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 57
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.3.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0xF555
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 57
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 78.1.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0xCE3F
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
本文出自 “神策” 博客，请务必保留此出处http://liu008qing.blog.51cto.com/151315/450077
二、实验目的
1.观察各类LSA的内容通告ID以及链路ID分别是什么
2.各类LSA由谁发出的，作用是什么
3.抓包查看hello包的内容
三、实验步骤
启动R3-R8，配置IP地址并按区域运行ospf 110
1.抓包看hello包的内容
通过抓包看到Hello包的内容包括：Ospf的版本号v2，发送Hello包的路由器的Route-ID，区域ID，认证类型，子网掩码，Hello/dead时间，接口优先级，DR/BDR的接口地址，邻居的RID，应该还有Stub是否存在，因为没有配置Stub区域，此包未发现Stub置位。（可能观察有问题）
2.Lsa的总结，详细结果请看下面的Show命令的输出
| LSA的类型 | 由谁始发 | Link state ID | 通告路由器 | 作用 | 泛洪区域 |
| LSA 1 | 所有运行OSPF的路由器 | 路由器的RID | 路由器的RID | 列出了路由器的所有链路以及接口，指明了它们的状态和沿每条链路方向出站的代价，以及该链路上的所有已知的OSPF邻居 | 只在本区域泛洪 |
| LSA 2 | DR发出的 | DR的接口IP地址 | DR的Rid | 描绘出一个MA网络上的所有运行OSPF路由器 | 本区域内泛洪 |
| LSA 3 | ABR发出的 | 区域间路由的网络号 | ABR的RID | 通告的一条区域间的路由 | 在AS内泛洪 |
| LSA 4 | ABR发出的 | ASBR的RID | ABR的RID | ABR通告的ASBR的RID | 在整个AS内泛洪 |
| LSA 5 | ASBR始发的 | 外部路由 | ASBR的RID | 通告的一条外部路由 | 在整个AS内泛洪 |
| LSA 7 | NSSA区域的ASBR始发的 | 外部路由 | ASBR的RID | 通告的一条外部路由 | 只在NSSA区域内泛洪 |
内容包括：连接的网络号，掩码，邻居的RID以及DR的接口地址，连接某一区域的本地接口IP地址
R3#show ip ospf database router
OSPF Router with ID (3.3.3.3) (Process ID 110)
Router Link States (Area 0)
LS age: 1083
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000003
Checksum: 0x1092
Length: 48
Area Border Router
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 34.1.1.4
(Link Data) Router Interface address: 34.1.1.3
Number of TOS metrics: 0
TOS 0 Metrics: 10
Link connected to: a Stub Network
(Link ID) Network/subnet number: 3.3.3.3
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Routing Bit Set on this LSA
LS age: 1084
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 4.4.4.4
Advertising Router: 4.4.4.4
LS Seq Number: 80000004
Checksum: 0x850F
Length: 48
Area Border Router
Number of Links: 2
Link connected to: a Stub Network
(Link ID) Network/subnet number: 4.4.4.4
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Transit Network
(Link ID) Designated Router address: 34.1.1.4
(Link Data) Router Interface address: 34.1.1.4
Number of TOS metrics: 0
TOS 0 Metrics: 10
Router Link States (Area 1)
LS age: 1094
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000002
Checksum: 0x9791
Length: 48
Area Border Router
Number of Links: 2
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 5.5.5.5
(Link Data) Router Interface address: 35.1.1.3
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 35.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
LS age: 1091
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 5.5.5.5
Advertising Router: 5.5.5.5
LS Seq Number: 80000003
Checksum: 0x1CDD
Length: 60
Number of Links: 3
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 3.3.3.3
(Link Data) Router Interface address: 35.1.1.5
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 35.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 5.5.5.5
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Router Link States (Area 2)
LS age: 929
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000002
Checksum: 0xD74B
Length: 48
Area Border Router
Number of Links: 2
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 6.6.6.6
(Link Data) Router Interface address: 36.1.1.3
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 36.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
LS age: 930
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 6.6.6.6
Advertising Router: 6.6.6.6
LS Seq Number: 80000005
Checksum: 0xF28C
Length: 96
Number of Links: 6
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 3.3.3.3
(Link Data) Router Interface address: 36.1.1.6
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 36.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.3.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.2.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.1.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: a Stub Network
(Link ID) Network/subnet number: 6.6.0.6
(Link Data) Network Mask: 255.255.255.255
Number of TOS metrics: 0
TOS 0 Metrics: 1
2.LSA2：由DR发出的，只有在MA网络中才存在。LINK State ID为DR的接口IP地址，通告路由器ID为DR的RID
内容包括这条链路上所有邻居的RID
R3#show ip ospf database network
OSPF Router with ID (3.3.3.3) (Process ID 110)
Net Link States (Area 0)
Routing Bit Set on this LSA
LS age: 1349
Options: (No TOS-capability, DC)
LS Type: Network Links
Link State ID: 34.1.1.4 (address of Designated Router)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x4B9A
Length: 32
Network Mask: /24
Attached Router: 4.4.4.4
Attached Router: 3.3.3.3
3.LSA3 summary：链路ID为某一网络前缀，通告ID为ABR的RID，作用是一条路由的网络前缀，由ABR发送出来的，用来通告一条路由
R3#show ip ospf database summary
OSPF Router with ID (3.3.3.3) (Process ID 110)
Summary Net Link States (Area 0)
LS age: 1495
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 5.5.5.5 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD407
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.0.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE8F4
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.1.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDDFE
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.2.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD209
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1321
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.3.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC713
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
Routing Bit Set on this LSA
LS age: 1423
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 7.7.7.7 (summary Network Number)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x5A75
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1578
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 35.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD1F9
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
LS age: 1568
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 36.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC406
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
Routing Bit Set on this LSA
LS age: 1544
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 47.1.1.0 (summary Network Number)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x17A4
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
Summary Net Link States (Area 1)
LS age: 1583
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 3.3.3.3 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xAE75
Length: 28
Network Mask: /32
TOS: 0 Metric: 1
LS age: 1507
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 4.4.4.4 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE431
Length: 28
Network Mask: /32
TOS: 0 Metric: 11
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.0.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE8F4
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.1.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDDFE
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.2.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD209
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1323
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 6.6.3.6 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC713
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1423
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 7.7.7.7 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDCEC
Length: 28
Network Mask: /32
TOS: 0 Metric: 75
LS age: 1512
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 34.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000003
Checksum: 0xBC44
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
LS age: 1569
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 36.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC406
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
LS age: 1507
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 47.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x991C
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
Summary Net Link States (Area 2)
LS age: 1569
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 3.3.3.3 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xAE75
Length: 28
Network Mask: /32
TOS: 0 Metric: 1
LS age: 1507
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 4.4.4.4 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE431
Length: 28
Network Mask: /32
TOS: 0 Metric: 11
LS age: 1498
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 5.5.5.5 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD407
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
LS age: 1424
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 7.7.7.7 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xDCEC
Length: 28
Network Mask: /32
TOS: 0 Metric: 75
LS age: 1513
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 34.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000003
Checksum: 0xBC44
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
LS age: 1569
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 35.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xD1F9
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
LS age: 1508
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 47.1.1.0 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x991C
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
4.LSA4：需要将R7和R8之间的RIP网络启用，并重分布RIP到OSPF110
在ASBR上做重分布，在OSPF进程下
redistribute rip subnets
R5# 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
34.0.0.0/24 is subnetted, 1 subnets
O IA 34.1.1.0 [110/74] via 35.1.1.3, 00:31:20, Serial0/1
35.0.0.0/24 is subnetted, 1 subnets
C 35.1.1.0 is directly connected, Serial0/1
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/65] via 35.1.1.3, 00:31:20, Serial0/1
4.0.0.0/32 is subnetted, 1 subnets
O IA 4.4.4.4 [110/75] via 35.1.1.3, 00:31:20, Serial0/1
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
36.0.0.0/24 is subnetted, 1 subnets
O IA 36.1.1.0 [110/128] via 35.1.1.3, 00:31:20, Serial0/1
6.0.0.0/32 is subnetted, 4 subnets
O IA 6.6.2.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
O IA 6.6.3.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
O IA 6.6.0.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
O IA 6.6.1.6 [110/129] via 35.1.1.3, 00:28:35, Serial0/1
7.0.0.0/32 is subnetted, 1 subnets
O IA 7.7.7.7 [110/139] via 35.1.1.3, 00:30:15, Serial0/1
8.0.0.0/24 is subnetted, 4 subnets
O E2 8.8.0.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
O E2 8.8.1.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
O E2 8.8.2.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
O E2 8.8.3.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
78.0.0.0/24 is subnetted, 1 subnets
O E2 78.1.1.0 [110/20] via 35.1.1.3, 00:00:34, Serial0/1
47.0.0.0/24 is subnetted, 1 subnets
O IA 47.1.1.0 [110/138] via 35.1.1.3, 00:31:20, Serial0/
4.：LSA4 由ABR发送的，告诉路由器到达ASBR的RID，链路ID是ASBR的RID 通告路由器是ABR的RID
R3# show ip ospf database asbr-summary
OSPF Router with ID (3.3.3.3) (Process ID 110)
Summary ASB Link States (Area 0)
Routing Bit Set on this LSA
LS age: 105
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 7.7.7.7 (AS Boundary Router address)
Advertising Router: 4.4.4.4
LS Seq Number: 80000001
Checksum: 0x428D
Length: 28
Network Mask: /0
TOS: 0 Metric: 64
Summary ASB Link States (Area 1)
LS age: 104
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 7.7.7.7 (AS Boundary Router address)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC405
Length: 28
Network Mask: /0
TOS: 0 Metric: 74
Summary ASB Link States (Area 2)
LS age: 105
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 7.7.7.7 (AS Boundary Router address)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC405
Length: 28
Network Mask: /0
TOS: 0 Metric: 74
LSA5：由ASBR发送的，作用是一条外部路由的网络号/掩 码，链路ID是外部路由的网络号，通告路由器是ASBR的RID
R3#show ip ospf database external
OSPF Router with ID (3.3.3.3) (Process ID 110)
Type-5 AS External Link States
Routing Bit Set on this LSA
LS age: 237
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.0.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x4C28
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 237
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x4132
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 238
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.2.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x363C
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 238
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 8.8.3.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x2B46
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 238
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 78.1.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x430
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
LSA7：
将Area 3配置成NSSA区域
链路ID是外部路由的网络号，通告路由器是ASBR的RID
R4#show ip ospf database nssa-external
OSPF Router with ID (4.4.4.4) (Process ID 110)
Type-7 AS External Link States (Area 3)
Routing Bit Set on this LSA
LS age: 56
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.0.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x1737
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 56
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0xC41
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 57
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.2.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0x14B
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 57
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 8.8.3.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0xF555
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
Routing Bit Set on this LSA
LS age: 57
Options: (No TOS-capability, Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 78.1.1.0 (External Network Number )
Advertising Router: 7.7.7.7
LS Seq Number: 80000001
Checksum: 0xCE3F
Length: 36
Network Mask: /24
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 7.7.7.7
External Route Tag: 0
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