OSPF五種常見LSA

##OSPF 的序列號取值範圍：

0x80000001 Min

0x7FFFFFFF Max 

##OSPF定義了兩種確認機制：

 

顯示確認，使用專有的報文進行確認

隱式確認，（基於序列號的確認機制）收到一份報文，而後向發送者回復一份序列號相同的報文。 僅有ospf支持這種確認機制。dbd報文

##OSPF建議：

     一、一臺ABR最多關聯3個區域

     二、單個區域內最多包含50臺路由器

     三、一臺路由鄰居最多不超過60個

OSPF LSAs

     一、Router LSA

     二、Network LSA

     三、Summary LSA

     四、Summary ASB LSA

     五、External LSA

     

##Router LSA

     一、僅在本區域內傳播不能穿越ABR

     二、每臺屬於一個區域的路由器都會基於該區域通告一條1類LSA

     三、一個區域內只發一個一類LSA，包含純拓撲信息，包含全部宣告進此區域的直連鏈路、前綴、掩碼、網絡類型及度量值              

     

     Link-ID：通告該LSA的路由器的RID

     ADV Router：通告該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、同區域內傳播

     二、通告者：MA網段中的DR

     三、純拓撲信息，包含了該MA網段直連的全部路由器的RID信息，該MA網段的掩碼

Link-ID 該網段DR接口的IP地址

ADV Router ：該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、傳播範圍： 除了該區域外的整個OSPF路由選擇域

     二、通告者：ABR

     三、包含內容：一條3類LSA包含一條OSPF域間路由，O IA

     

     Link-ID ：3類LSA路由的前綴

     ADV Router ： ABR的RID 。 3類LSA在OSPF路由選擇域內傳遞的時候，爲了保證可達性，每跨越一個ABR都會自動改寫爲該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、傳遞範圍：除了ASBR所在區域以外的整個路由選擇域

     二、通告者：和ASBR在同一個區域的ABR路由器

     三、包含內容： 純拓撲信息，表述了ASBR所在位置

     Link-ID：ASBR的RID

     ADV Router :通告者ABR的RID，而且該值每跨越一個ABR都會自動改變，同3類LSA

##External LSA

     一、傳遞範圍： 整個OSPF路由選擇域

     二、通告者： ASBR

     三、包含內容： 純路由信息，一條OSPF域外路由對應一條5類LSA

     Link-ID 域外路由的路由前綴

     ADV Router ASBR的RID ，該LSA在OSPF域內傳遞時，ADV Router 不會發生任何改變。

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上僅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 :種子度量值

     對於OSPF而言，若是將BGP路由重分發進入，則Seed Metric默認爲1，全部其餘外部路由缺省SeedMetric爲20；

     重分發路由進OSPF指定metric-type 和metric值， 使用tag能夠配合route-map等實現高級路由控制。