OSPF-3 lsa
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LSA1:直连的网段、直连的路由器（邻居）、虚电路。
Show ip ospf database
Show ip ospf database router 1.1.1.1
R1#sh ip os da router 1.1.1.1
OSPF Router with ID (1.1.1.1) (Process ID 1) Router Link States (Area 0)
LS age: 1311-------------------------------------3600
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: 80000025
Checksum: 0xBA84
Length: 96
Number of Links: 6
Link connected to: a Transit Network------------ma网络
(Link ID) Designated Router address: 10.1.1.3
(Link Data) Router Interface address: 10.1.1.1
Number of TOS metrics: 0
TOS 0 Metrics: 10
Link connected to: a Stub Network--------直连非ma网络
(Link ID) Network/subnet number: 1.1.1.1
(Link Data) Network Mask: 255.255.255.255-----ospf宣告
Number of TOS metrics: 0
TOS 0 Metrics: 1
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 3.3.3.3
(Link Data) Router Interface address: 13.1.1.1
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: a Stub Network
(Link ID) Network/subnet number: 13.1.1.0
(Link Data) Network Mask: 255.255.255.0
Number of TOS metrics: 0
TOS 0 Metrics: 64
Link connected to: another Router (point-to-point)
(Link ID) Neighboring Router ID: 2.2.2.2
(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
LSA2:由dr公告给网段中的其他路由器、通告网络的掩码、网络中的邻居。
Show ip ospf database
在router lsa中link id 和adv router是相同的，在net lsa中link id 为dr Show ip ospf database network 10.1.1.3
LSA3：描述域间路由、目标网络前缀和掩码、cost .由ABR公告。
Show ip ospf database
Show ip ospf database summary
R5#sh ip ospf database summary
OSPF Router with ID (35.1.1.5) (Process ID 1)
Summary Net Link States (Area 35)
Routing Bit Set on this LSA
LS age: 343
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: 80000001
Checksum: 0x6FB2
Length: 28
Network Mask: /32
TOS: 0 Metric: 11
Routing Bit Set on this LSA
LS age: 343
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 2.2.2.2 (summary Network Number)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x41DC
Length: 28
Network Mask: /32
TOS: 0 Metric: 11
Routing Bit Set on this LSA
LS age: 346
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
Routing Bit Set on this LSA
LS age: 346
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 10.1.1.0 (summary Network Number) Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xF921
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
Routing Bit Set on this LSA
LS age: 346
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 12.1.1.0 (summary Network Number) Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x6276
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
Routing Bit Set on this LSA
LS age: 347
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 13.1.1.0 (summary Network Number) Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xF0F0
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
Routing Bit Set on this LSA
LS age: 347
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 24.1.1.0 (summary Network Number) Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xC507
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
R3# show ip ospf database summary 24.1.1.0
本区域summary net links state中存储着所有本区域外所有网段的条目。
在看LSA3信息时，我们可以看到这条路由是哪个ABR通告的，这个网段的掩码是多少。
域间路由有距离矢量的特征。
R5show ip route
一个区域外条目cost等于本区域内cost加上ABR通告的cost.域间路由标识 o IA .我们可以用show ip route | o IA 来查找域间路由。
重分布路由 O E2和O E1 ,show ip route | o e2.可以在做重分布的时候更改类型redistribute rip subnets metric-type 1
R2#sh ip ospf database (asbr)部分信息：
R1#sh ip os da (ospf进程的一个普通路由器)部分信息：
R3#sh ip so da(abr)部分信息：
R5：sh ip os da (通过asbr和abr才能访问as外的网络)部分信息：
LSA4:ABR产生描述ASBR的信息，发送到此ABR直连但是ASBR不直连的网络。
Show ip ospf database asbr-summary
LSA5:描述AS域外的每一个网段，ASBR产生发送给域内的每个路由器。
Show ip ospf database external
R5#sh ip ospf da external
OSPF Router with ID (35.1.1.5) (Process ID 1)
Type-5 AS External Link States
Routing Bit Set on this LSA
LS age: 168
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 4.4.4.0 (External Network Number )
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0x1B71
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: 489
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 24.1.1.0 (External Network Number )
Advertising Router: 2.2.2.2
LS Seq Number: 80000002
Checksum: 0x5924
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。