OSPF五种常见LSA

时间 2020-01-27

标签 ospf 五种常见 lsa 繁體版

原文原文链接

##OSPF 的序列号取值范围：网络

0x80000001 Minide

0x7FFFFFFF Max this

##OSPF定义了两种确认机制：url

显示确认，使用专有的报文进行确认spa

隐式确认，（基于序列号的确认机制）收到一份报文，而后向发送者回复一份序列号相同的报文。仅有ospf支持这种确认机制。dbd报文pwa

##OSPF建议：router

一、一台ABR最多关联3个区域接口

二、单个区域内最多包含50台路由器ip

三、一台路由邻居最多不超过60个路由

OSPF LSAs

一、Router LSA

二、Network LSA

三、Summary LSA

四、Summary ASB LSA

五、External LSA

##Router LSA

一、仅在本区域内传播不能穿越ABR

二、每台属于一个区域的路由器都会基于该区域通告一条1类LSA

三、一个区域内只发一个一类LSA，包含纯拓扑信息，包含全部宣告进此区域的直连链路、前缀、掩码、网络类型及度量值

Link-ID：通告该LSA的路由器的RID

ADV Router：通告该LSA的路由器的RID

R1#sh ip os database

OSPF Router with ID (91.1.1.1) (Process ID 110)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 17 0x80000003 0x0058F8 3

92.2.2.2 92.2.2.2 18 0x80000002 0x00F751 3

R1#

R1# sh ip os da router

OSPF Router with ID (91.1.1.1) (Process ID 110)

Router Link States (Area 0)

LS age: 109

Options: (No TOS-capability, DC)

LS Type: Router Links

Link State ID: 91.1.1.1

Advertising Router: 91.1.1.1

LS Seq Number: 80000003

Checksum: 0x58F8

Length: 60

Number of Links: 3

Link connected to: a Stub Network

(Link ID) Network/subnet number: 1.1.1.1

(Link Data) Network Mask: 255.255.255.255

Number of TOS metrics: 0

TOS 0 Metrics: 1

Link connected to: another Router (point-to-point)

(Link ID) Neighboring Router ID: 92.2.2.2

(Link Data) Router Interface address: 12.1.1.1

Number of TOS metrics: 0

TOS 0 Metrics: 64

Link connected to: a Stub Network

(Link ID) Network/subnet number: 12.1.1.0

(Link Data) Network Mask: 255.255.255.0

Number of TOS metrics: 0

TOS 0 Metrics: 64

LS age: 111

Options: (No TOS-capability, DC)

LS Type: Router Links

Link State ID: 92.2.2.2

Advertising Router: 92.2.2.2

LS Seq Number: 80000002

Checksum: 0xF751

Length: 60

Number of Links: 3

Link connected to: a Stub Network

(Link ID) Network/subnet number: 2.2.2.2

(Link Data) Network Mask: 255.255.255.255

Number of TOS metrics: 0

TOS 0 Metrics: 1

Link connected to: another Router (point-to-point)

(Link ID) Neighboring Router ID: 91.1.1.1

(Link Data) Router Interface address: 12.1.1.2

Number of TOS metrics: 0

TOS 0 Metrics: 64

Link connected to: a Stub Network

(Link ID) Network/subnet number: 12.1.1.0

(Link Data) Network Mask: 255.255.255.0

Number of TOS metrics: 0

TOS 0 Metrics: 64

R1#

##Network LSA

一、同区域内传播

二、通告者：MA网段中的DR

三、纯拓扑信息，包含了该MA网段直连的全部路由器的RID信息，该MA网段的掩码

Link-ID 该网段DR接口的IP地址

ADV Router ：该DR的RID

R1#sh ip os da

OSPF Router with ID (91.1.1.1) (Process ID 110)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 461 0x80000005 0x001F47 4

92.2.2.2 92.2.2.2 462 0x80000004 0x00B4A8 4

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

100.1.1.2 92.2.2.2 462 0x80000001 0x00C2EB

R1#

R1#sh ip os da router

OSPF Router with ID (91.1.1.1) (Process ID 110)

Router Link States (Area 0)

LS age: 470

Options: (No TOS-capability, DC)

LS Type: Router Links

Link State ID: 91.1.1.1

Advertising Router: 91.1.1.1

LS Seq Number: 80000005

Checksum: 0x1F47

Length: 72

Number of Links: 4

Link connected to: a Stub Network

(Link ID) Network/subnet number: 1.1.1.1

(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: 100.1.1.2

(Link Data) Router Interface address: 100.1.1.1

Number of TOS metrics: 0

TOS 0 Metrics: 10

Link connected to: another Router (point-to-point)

(Link ID) Neighboring Router ID: 92.2.2.2

(Link Data) Router Interface address: 12.1.1.1

Number of TOS metrics: 0

TOS 0 Metrics: 64

Link connected to: a Stub Network

(Link ID) Network/subnet number: 12.1.1.0

(Link Data) Network Mask: 255.255.255.0

Number of TOS metrics: 0

TOS 0 Metrics: 64

LS age: 471

Options: (No TOS-capability, DC)

LS Type: Router Links

Link State ID: 92.2.2.2

Advertising Router: 92.2.2.2

LS Seq Number: 80000004

Checksum: 0xB4A8

Length: 72

Number of Links: 4

Link connected to: a Stub Network

(Link ID) Network/subnet number: 2.2.2.2

(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: 100.1.1.2

(Link Data) Router Interface address: 100.1.1.2

Number of TOS metrics: 0

TOS 0 Metrics: 10

Link connected to: another Router (point-to-point)

(Link ID) Neighboring Router ID: 91.1.1.1

(Link Data) Router Interface address: 12.1.1.2

Number of TOS metrics: 0

TOS 0 Metrics: 64

Link connected to: a Stub Network

(Link ID) Network/subnet number: 12.1.1.0

(Link Data) Network Mask: 255.255.255.0

Number of TOS metrics: 0

TOS 0 Metrics: 64

R1#

R1#sh ip os da network

OSPF Router with ID (91.1.1.1) (Process ID 110)

Net Link States (Area 0)

Routing Bit Set on this LSA

LS age: 482

Options: (No TOS-capability, DC)

LS Type: Network Links

Link State ID: 100.1.1.2 (address of Designated Router)

Advertising Router: 92.2.2.2

LS Seq Number: 80000001

Checksum: 0xC2EB

Length: 32

Network Mask: /24

Attached Router: 92.2.2.2

Attached Router: 91.1.1.1

R1#

##Summary LSA (Summary Network LSA)

一、传播范围：除了该区域外的整个OSPF路由选择域

二、通告者：ABR

三、包含内容：一条3类LSA包含一条OSPF域间路由，O IA

Link-ID ：3类LSA路由的前缀

ADV Router ： ABR的RID 。 3类LSA在OSPF路由选择域内传递的时候，为了保证可达性，每跨越一个ABR都会自动改写为该ABR的RID

R3#sh ip os database

OSPF Router with ID (93.3.3.3) (Process ID 110)

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 936 0x80000002 0x00ED72 2

93.3.3.3 93.3.3.3 935 0x80000002 0x001E1C 3

Summary Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

1.1.1.1 91.1.1.1 1048 0x80000001 0x001ABF

2.2.2.2 91.1.1.1 1048 0x80000001 0x00507B

4.4.4.4 91.1.1.1 236 0x80000001 0x00760D

12.1.1.0 91.1.1.1 1048 0x80000001 0x000D83

24.1.1.0 91.1.1.1 298 0x80000001 0x00D4A5

100.1.1.0 91.1.1.1 1048 0x80000001 0x0072FB

R3#

R3#sh ip os da sum

OSPF Router with ID (93.3.3.3) (Process ID 110)

Summary Net Link States (Area 1)

Routing Bit Set on this LSA

LS age: 1075

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 1.1.1.1 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x1ABF

Length: 28

Network Mask: /32

TOS: 0 Metric: 1

Routing Bit Set on this LSA

LS age: 1075

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 2.2.2.2 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x507B

Length: 28

Network Mask: /32

TOS: 0 Metric: 11

Routing Bit Set on this LSA

LS age: 264

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 4.4.4.4 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x760D

Length: 28

Network Mask: /32

TOS: 0 Metric: 75

Routing Bit Set on this LSA

LS age: 1076

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 12.1.1.0 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0xD83

Length: 28

Network Mask: /24

TOS: 0 Metric: 64

Routing Bit Set on this LSA

LS age: 326

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 24.1.1.0 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0xD4A5

Length: 28

Network Mask: /24

TOS: 0 Metric: 74

Routing Bit Set on this LSA

LS age: 1076

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 100.1.1.0 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x72FB

Length: 28

Network Mask: /24

TOS: 0 Metric: 10

R3#

======

R1#sh ip os da ta

OSPF Router with ID (91.1.1.1) (Process ID 110)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 1126 0x80000008 0x001C46 4

92.2.2.2 92.2.2.2 381 0x80000008 0x00AFA8 4

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

100.1.1.2 92.2.2.2 459 0x80000002 0x00C0EC

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

3.3.3.3 91.1.1.1 1008 0x80000001 0x004051

4.4.4.4 92.2.2.2 315 0x80000001 0x00F395

13.1.1.0 91.1.1.1 1121 0x80000001 0x00FF8F

24.1.1.0 92.2.2.2 377 0x80000001 0x00522E

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 1013 0x80000002 0x00ED72 2

93.3.3.3 93.3.3.3 1016 0x80000002 0x001E1C 3

Summary Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

1.1.1.1 91.1.1.1 1128 0x80000001 0x001ABF

2.2.2.2 91.1.1.1 1128 0x80000001 0x00507B

4.4.4.4 91.1.1.1 315 0x80000001 0x00760D

12.1.1.0 91.1.1.1 1128 0x80000001 0x000D83

24.1.1.0 91.1.1.1 377 0x80000001 0x00D4A5

100.1.1.0 91.1.1.1 1128 0x80000001 0x0072FB

R1#

R1#sh ip os da sum mary

OSPF Router with ID (91.1.1.1) (Process ID 110)

Summary Net Link States (Area 0)

LS age: 1020

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 3.3.3.3 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x4051

Length: 28

Network Mask: /32

TOS: 0 Metric: 65

Routing Bit Set on this LSA

LS age: 326

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 4.4.4.4 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000001

Checksum: 0xF395

Length: 28

Network Mask: /32

TOS: 0 Metric: 65

LS age: 1134

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 13.1.1.0 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0xFF8F

Length: 28

Network Mask: /24

TOS: 0 Metric: 64

Routing Bit Set on this LSA

LS age: 390

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 24.1.1.0 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000001

Checksum: 0x522E

Length: 28

Network Mask: /24

TOS: 0 Metric: 64

Summary Net Link States (Area 1)

LS age: 1140

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 1.1.1.1 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x1ABF

Length: 28

Network Mask: /32

TOS: 0 Metric: 1

LS age: 1140

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 2.2.2.2 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x507B

Length: 28

Network Mask: /32

TOS: 0 Metric: 11

LS age: 328

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 4.4.4.4 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x760D

Length: 28

Network Mask: /32

TOS: 0 Metric: 75

LS age: 1141

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 12.1.1.0 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0xD83

Length: 28

Network Mask: /24

TOS: 0 Metric: 64

LS age: 390

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 24.1.1.0 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0xD4A5

Length: 28

Network Mask: /24

TOS: 0 Metric: 74

LS age: 1142

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 100.1.1.0 (summary Network Number)

Advertising Router: 91.1.1.1

LS Seq Number: 80000001

Checksum: 0x72FB

Length: 28

Network Mask: /24

TOS: 0 Metric: 10

R1#

==============

R4#sh ip os da

OSPF Router with ID (94.4.4.4) (Process ID 110)

Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count

92.2.2.2 92.2.2.2 391 0x80000004 0x001922 2

94.4.4.4 94.4.4.4 390 0x80000002 0x00B45E 3

Summary Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum

1.1.1.1 92.2.2.2 453 0x80000002 0x005E6C

2.2.2.2 92.2.2.2 453 0x80000002 0x00CB05

3.3.3.3 92.2.2.2 453 0x80000002 0x0084FD

12.1.1.0 92.2.2.2 453 0x80000002 0x00EC9E

13.1.1.0 92.2.2.2 453 0x80000002 0x00443C

100.1.1.0 92.2.2.2 453 0x80000002 0x005217

R4#

R4#sh ip os da summary

OSPF Router with ID (94.4.4.4) (Process ID 110)

Summary Net Link States (Area 2)

Routing Bit Set on this LSA

LS age: 463

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 1.1.1.1 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000002

Checksum: 0x5E6C

Length: 28

Network Mask: /32

TOS: 0 Metric: 11

Routing Bit Set on this LSA

LS age: 463

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 2.2.2.2 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000002

Checksum: 0xCB05

Length: 28

Network Mask: /32

TOS: 0 Metric: 1

Routing Bit Set on this LSA

LS age: 464

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 3.3.3.3 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000002

Checksum: 0x84FD

Length: 28

Network Mask: /32

TOS: 0 Metric: 75

Routing Bit Set on this LSA

LS age: 464

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 12.1.1.0 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000002

Checksum: 0xEC9E

Length: 28

Network Mask: /24

TOS: 0 Metric: 64

Routing Bit Set on this LSA

LS age: 464

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 13.1.1.0 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000002

Checksum: 0x443C

Length: 28

Network Mask: /24

TOS: 0 Metric: 74

Routing Bit Set on this LSA

LS age: 464

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(Network)

Link State ID: 100.1.1.0 (summary Network Number)

Advertising Router: 92.2.2.2

LS Seq Number: 80000002

Checksum: 0x5217

Length: 28

Network Mask: /24

TOS: 0 Metric: 10

R4#

##Summary ASB LSA

一、传递范围：除了ASBR所在区域以外的整个路由选择域

二、通告者：和ASBR在同一个区域的ABR路由器

三、包含内容：纯拓扑信息，表述了ASBR所在位置

Link-ID：ASBR的RID

ADV Router :通告者ABR的RID，而且该值每跨越一个ABR都会自动改变，同3类LSA

##External LSA

一、传递范围：整个OSPF路由选择域

二、通告者： ASBR

三、包含内容：纯路由信息，一条OSPF域外路由对应一条5类LSA

Link-ID 域外路由的路由前缀

ADV Router ASBR的RID ，该LSA在OSPF域内传递时，ADV Router 不会发生任何改变。

R4#sh ip os database

OSPF Router with ID (94.4.4.4) (Process ID 110)

Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count

92.2.2.2 92.2.2.2 1133 0x80000011 0x00FE2F 2

94.4.4.4 94.4.4.4 1919 0x8000000F 0x00A063 3

Summary Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum

1.1.1.1 92.2.2.2 1133 0x8000000F 0x004479

2.2.2.2 92.2.2.2 1133 0x8000000F 0x00B112

3.3.3.3 92.2.2.2 1133 0x8000000F 0x006A0B

12.1.1.0 92.2.2.2 1133 0x8000000F 0x00D2AB

13.1.1.0 92.2.2.2 1133 0x8000000F 0x002A49

100.1.1.0 92.2.2.2 1133 0x8000000F 0x003824

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

5.5.5.0 94.4.4.4 1919 0x80000002 0x008B9A 0

45.1.1.0 94.4.4.4 1919 0x80000002 0x00DD28 0

R4#

R4#sh ip os da ex

OSPF Router with ID (94.4.4.4) (Process ID 110)

Type-5 AS External Link States

LS age: 1994

Options: (No TOS-capability, DC)

LS Type: AS External Link

Link State ID: 5.5.5.0 (External Network Number )

Advertising Router: 94.4.4.4

LS Seq Number: 80000002

Checksum: 0x8B9A

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

LS age: 1994

Options: (No TOS-capability, DC)

LS Type: AS External Link

Link State ID: 45.1.1.0 (External Network Number )

Advertising Router: 94.4.4.4

LS Seq Number: 80000002

Checksum: 0xDD28

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

R4#

R2#sh ip os da ta

OSPF Router with ID (92.2.2.2) (Process ID 110)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 130 0x80000016 0x00FF54 4

92.2.2.2 92.2.2.2 1299 0x80000015 0x0095B5 4

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

100.1.1.2 92.2.2.2 1299 0x8000000F 0x00A6F9

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

3.3.3.3 91.1.1.1 1869 0x8000000E 0x00265E

4.4.4.4 92.2.2.2 1299 0x8000000E 0x00D9A2

13.1.1.0 91.1.1.1 130 0x8000000F 0x00E39D

24.1.1.0 92.2.2.2 1299 0x8000000E 0x00383B

Summary ASB Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

94.4.4.4 92.2.2.2 55 0x80000003 0x0041EB

Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count

92.2.2.2 92.2.2.2 1300 0x80000011 0x00FE2F 2

94.4.4.4 94.4.4.4 56 0x80000010 0x009E64 3

Summary Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum

1.1.1.1 92.2.2.2 1300 0x8000000F 0x004479

2.2.2.2 92.2.2.2 1301 0x8000000F 0x00B112

3.3.3.3 92.2.2.2 1301 0x8000000F 0x006A0B

12.1.1.0 92.2.2.2 1301 0x8000000F 0x00D2AB

13.1.1.0 92.2.2.2 1301 0x8000000F 0x002A49

100.1.1.0 92.2.2.2 1301 0x8000000F 0x003824

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

5.5.5.0 94.4.4.4 58 0x80000003 0x00899B 0

45.1.1.0 94.4.4.4 58 0x80000003 0x00DB29 0

R2#

R2#sh ip os da asb

R2#sh ip os da asbr-summary

OSPF Router with ID (92.2.2.2) (Process ID 110)

Summary ASB Link States (Area 0)

LS age: 79

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(AS Boundary Router)

Link State ID: 94.4.4.4 (AS Boundary Router address)

Advertising Router: 92.2.2.2

LS Seq Number: 80000003

Checksum: 0x41EB

Length: 28

Network Mask: /0

TOS: 0 Metric: 64

R2# //R2上仅area0中存在ASB LSA

R1#sh ip os da

OSPF Router with ID (91.1.1.1) (Process ID 110)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 385 0x80000016 0x00FF54 4

92.2.2.2 92.2.2.2 1556 0x80000015 0x0095B5 4

Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

100.1.1.2 92.2.2.2 1556 0x8000000F 0x00A6F9

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

3.3.3.3 91.1.1.1 128 0x8000000F 0x00245F

4.4.4.4 92.2.2.2 1556 0x8000000E 0x00D9A2

13.1.1.0 91.1.1.1 385 0x8000000F 0x00E39D

24.1.1.0 92.2.2.2 1556 0x8000000E 0x00383B

Summary ASB Link States (Area 0)

Link ID ADV Router Age Seq# Checksum

94.4.4.4 92.2.2.2 312 0x80000003 0x0041EB

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 135 0x80000010 0x00D180 2

93.3.3.3 93.3.3.3 42 0x80000010 0x00022A 3

Summary Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

1.1.1.1 91.1.1.1 392 0x8000000F 0x00FDCD

2.2.2.2 91.1.1.1 392 0x8000000F 0x003489

4.4.4.4 91.1.1.1 1392 0x8000000E 0x005C1A

12.1.1.0 91.1.1.1 392 0x8000000F 0x00F091

24.1.1.0 91.1.1.1 1633 0x8000000E 0x00BAB2

100.1.1.0 91.1.1.1 392 0x8000000F 0x00560A

Summary ASB Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

94.4.4.4 91.1.1.1 392 0x80000003 0x00C363

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

5.5.5.0 94.4.4.4 324 0x80000003 0x00899B 0

45.1.1.0 94.4.4.4 324 0x80000003 0x00DB29 0

R1#

R1#sh ip os da asbr-su

OSPF Router with ID (91.1.1.1) (Process ID 110)

Summary ASB Link States (Area 0)

Routing Bit Set on this LSA

LS age: 350

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(AS Boundary Router)

Link State ID: 94.4.4.4 (AS Boundary Router address)

Advertising Router: 92.2.2.2

LS Seq Number: 80000003

Checksum: 0x41EB

Length: 28

Network Mask: /0

TOS: 0 Metric: 64

Summary ASB Link States (Area 1)

LS age: 423

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(AS Boundary Router)

Link State ID: 94.4.4.4 (AS Boundary Router address)

Advertising Router: 91.1.1.1

LS Seq Number: 80000003

Checksum: 0xC363

Length: 28

Network Mask: /0

TOS: 0 Metric: 74

R1#

R1# sh ip os da ex

OSPF Router with ID (91.1.1.1) (Process ID 110)

Type-5 AS External Link States

Routing Bit Set on this LSA

LS age: 396

Options: (No TOS-capability, DC)

LS Type: AS External Link

Link State ID: 5.5.5.0 (External Network Number )

Advertising Router: 94.4.4.4

LS Seq Number: 80000003

Checksum: 0x899B

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: 396

Options: (No TOS-capability, DC)

LS Type: AS External Link

Link State ID: 45.1.1.0 (External Network Number )

Advertising Router: 94.4.4.4

LS Seq Number: 80000003

Checksum: 0xDB29

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

R1#

R3#sh ip os database

OSPF Router with ID (93.3.3.3) (Process ID 110)

Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count

91.1.1.1 91.1.1.1 240 0x80000010 0x00D180 2

93.3.3.3 93.3.3.3 145 0x80000010 0x00022A 3

Summary Net Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

1.1.1.1 91.1.1.1 497 0x8000000F 0x00FDCD

2.2.2.2 91.1.1.1 497 0x8000000F 0x003489

4.4.4.4 91.1.1.1 1496 0x8000000E 0x005C1A

12.1.1.0 91.1.1.1 497 0x8000000F 0x00F091

24.1.1.0 91.1.1.1 1737 0x8000000E 0x00BAB2

100.1.1.0 91.1.1.1 497 0x8000000F 0x00560A

Summary ASB Link States (Area 1)

Link ID ADV Router Age Seq# Checksum

94.4.4.4 91.1.1.1 497 0x80000003 0x00C363

Type-5 AS External Link States

Link ID ADV Router Age Seq# Checksum Tag

5.5.5.0 94.4.4.4 424 0x80000003 0x00899B 0

45.1.1.0 94.4.4.4 426 0x80000003 0x00DB29 0

R3#

R3#sh ip os da asb

OSPF Router with ID (93.3.3.3) (Process ID 110)

Summary ASB Link States (Area 1)

Routing Bit Set on this LSA

LS age: 506

Options: (No TOS-capability, DC, Upward)

LS Type: Summary Links(AS Boundary Router)

Link State ID: 94.4.4.4 (AS Boundary Router address)

Advertising Router: 91.1.1.1

LS Seq Number: 80000003

Checksum: 0xC363

Length: 28

Network Mask: /0

TOS: 0 Metric: 74

R3# sh ip os da ex

OSPF Router with ID (93.3.3.3) (Process ID 110)

Type-5 AS External Link States

Routing Bit Set on this LSA

LS age: 546

Options: (No TOS-capability, DC)

LS Type: AS External Link

Link State ID: 5.5.5.0 (External Network Number )

Advertising Router: 94.4.4.4

LS Seq Number: 80000003

Checksum: 0x899B

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: 546

Options: (No TOS-capability, DC)

LS Type: AS External Link

Link State ID: 45.1.1.0 (External Network Number )

Advertising Router: 94.4.4.4

LS Seq Number: 80000003

Checksum: 0xDB29

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

R3#

Seed Metric :种子度量值

对于OSPF而言，若是将BGP路由重分发进入，则Seed Metric默认为1，全部其余外部路由缺省SeedMetric为20；

重分发路由进OSPF指定metric-type 和metric值，使用tag能够配合route-map等实现高级路由控制。