思科设备的OSPF协议的LSA查看命令以及各类LSA类型说明

小乔

LSA查看命令：

show ip ospf database //查看OSPF Database//

show ip ospf database router //查看一类LSA//

show ip ospf database network //查看二类LSA//

show ip ospf database summary //查看三类LSA//

show ip ospf database asbr-summary //查看四类LSA//

show ip ospf database external //查看五类LSA//

show ip ospf database nssa-external //查看七类LSA//

一类LSA

点到点类型链路生成的一类LSA包括两种类型：point-to-point 和Stub Network，一类LSA只能在本区域传输，不能夸区域。

R2#show ip ospf database router 3.3.3.3

OSPF Router with ID (2.2.2.2) (Process ID 110)

Router Link States (Area 10)

Routing Bit Set on this LSA in topology Base with MTID 0

LS age: 1458

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: 0xC586

Length: 48

Area Border Router

Number of Links: 2

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

(Link ID) Neighboring Router ID: 2.2.2.2

(Link Data) Router Interface address: 23.1.1.3

Number of MTID metrics: 0

TOS 0 Metrics: 64

Link connected to: a Stub Network

(Link ID) Network/subnet number: 23.1.1.0

(Link Data) Network Mask: 255.255.255.0

Number of MTID metrics: 0

TOS 0 Metrics: 64

MA网络类型：MA形成的一类LSA有transit和stubnet。

R1#show ip ospf database router 1.1.1.1

OSPF Router with ID (1.1.1.1) (Process ID 110)

Router Link States (Area 10)

LS age: 1620

Options: (No TOS-capability, DC)

LS Type: Router Links

Link State ID: 1.1.1.1

Advertising Router: 1.1.1.1

LS Seq Number: 80000005

Checksum: 0xF978

Length: 48

Number of Links: 2

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 MTID metrics: 0

TOS 0 Metrics: 1

Link connected to: a Transit Network

(Link ID) Designated Router address: 172.16.10.8

(Link Data) Router Interface address: 172.16.10.1

Number of MTID metrics: 0

TOS 0 Metrics: 10

二类LSA

Network LSA：只有MA网络才会生成Network LSA 有DR生成，只能在本区域传输。

R1#show ip ospf database network 172.16.10.8

OSPF Router with ID (1.1.1.1) (Process ID 110)

Net Link States (Area 10)

Routing Bit Set on this LSA in topology Base with MTID 0

LS age: 297

Options: (No TOS-capability, DC)

LS Type: Network Links

Link State ID: 172.16.10.8 (address of Designated Router)

Advertising Router: 8.8.8.8

LS Seq Number: 80000004

Checksum: 0x34E3

Length: 36

Network Mask: /24

Attached Router: 8.8.8.8

Attached Router: 1.1.1.1

Attached Router: 2.2.2.2

三类LSA

三类LSA跨越整个OSPF区域，但经过ABR后会被修改，ADV会变成ABR的地址。

R3#show ip ospf database summary 1.1.1.1

OSPF Router with ID (3.3.3.3) (Process ID 110)

Summary Net Link States (Area 0)

LS age: 973

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

LS Type: Summary Links(Network)

Link State ID: 1.1.1.1 (summary Network Number)

Advertising Router: 3.3.3.3

LS Seq Number: 80000003

Checksum: 0xEDF1

Length: 28

Network Mask: /32

MTID: 0 Metric: 75

四类LSA

4类LSA是描述ABSR的位置信息。

R5#show ip ospf database asbr-summary 6.6.6.6

OSPF Router with ID (5.5.5.5) (Process ID 110)

Summary ASB Link States (Area 0)

Routing Bit Set on this LSA in topology Base with MTID 0

LS age: 313

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

LS Type: Summary Links(AS Boundary Router)

Link State ID: 6.6.6.6 (AS Boundary Router address)

Advertising Router: 4.4.4.4

LS Seq Number: 80000003

Checksum: 0x4EB9

Length: 28

Network Mask: /0

MTID: 0 Metric: 10

五类LSA

5类LSA是描述的是外部的路由信息，可以跨越整个OSPF 区域，而且在传递过程中，是不能被改变的。

R1#show ip ospf database external 7.7.7.7

OSPF Router with ID (1.1.1.1) (Process ID 110)

Type-5 AS External Link States

Routing Bit Set on this LSA in topology Base with MTID 0

LS age: 792

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

LS Type: AS External Link

Link State ID: 7.7.7.7 (External Network Number )

Advertising Router: 6.6.6.6

LS Seq Number: 80000005

Checksum: 0xE780

Length: 36

Network Mask: /32

Metric Type: 2 (Larger than any link state path)

MTID: 0

Metric: 20

Forward Address: 0.0.0.0

External Route Tag: 0