OSPFv2 Protocol LSA Header
- OSPFv2 Router LSA
- OSPFv2 Network LSA
- OSPFv2 Network/ASBR Summary LSA
- OSPFv2 Autonomous System External LSA
- OSPFv2 Not-So-Stubby Area External LSA
OSPFv2 Protocol LSA Header
┃ 16bit | 8bit | 8bit ┃
┏----------+--------+------┓
┃ Age | Option | Type ┃
┠----------+--------+------┨
┃ Link State ID ┃
┠--------------------------┨
┃ Advertising Router ┃
┠--------------------------┨
┃ Sequence ┃
┠----------+---------------┨
┃ Checksum | Length ┃
┗----------+---------------┛
| Type | LSA Type | Command |
|---|---|---|
| 1 | Router LSA | show ip ospf database router |
| 2 | Network LSA | show ip ospf database network |
| 3 | Network Summary LSA | show ip ospf database summary |
| 4 | ASBR Summary LSA | show ip ospf database asbr-summary |
| 5 | AS External LSA | show ip ospf database external |
| 6 | Group Membership LSA | |
| 7 | NSSA External LSA | show ip ospf database nssa-external |
| 8 | External Attributes LSA | show ip ospf database |
| 9 | Opaque LSA (link链路本地范围 ) | |
| 10 | Opaque LSA (area本地区域范围) | |
| 11 | Opaque LSA (AS范围) |
OSPFv2 Router LSA
┃ 8bit | 8bit | 8bit | 8bit ┃
┏---------------------------+--------+--------┓
┃ Age | Option | Type=1 ┃
┠---------------------------+--------+--------┨
┃ Link State ID ┃
┠---------------------------------------------┨
┃ Advertising Router ┃
┠---------------------------------------------┨
┃ Sequence ┃
┠---------------------------+-----------------┨
┃ Checksum | Length ┃
┠-----------+---------------+-----------------┨
┃00000|V|E|B| 0x00 | Number of Links ┃
┠-----------+---------------+-----------------┨
┃ Link ID ┃
┠---------------------------------------------┨
┃ Link Data ┃
┠-----------+---------------+-----------------┨
┃ Link Type | Number of Tos | Metric ┃
┠-----------+---------------+-----------------┨
┃ Tos | 0x00 | Tos Metric ┃
┠-----------+---------------+-----------------┨
┃ ... ┃
┠---------------------------------------------┨
┃ Link ID ┃
┠---------------------------------------------┨
┃ Link Data ┃
┗---------------------------------------------┛
| Link Type | Link connected to: | Link ID Value | Link Data Value |
|---|---|---|---|
| 1 | another Router (point-to-point) | neighboring router’s ID | 和网络相连的始发路由器接口的ipaddr |
| 2 | a Transit Network | designated router’s interface’s IP addr | 和网络相连的始发路由器接口的ipaddr |
| 3 | a Stub Network | IP网络/子网地址 | 网络ip addr / subnet mask |
| 4 | virtual link | neighboring router’s ID | 始发路由器接口的mib-ii ifindex值 |
OSPFv2 Network LSA
┃ 16bit | 8bit | 8bit ┃
┏----------+--------+------┓
┃ Age | Option |Type=2┃
┠----------+--------+------┨
┃ Link State ID ┃
┠--------------------------┨
┃ Advertising Router ┃
┠--------------------------┨
┃ Sequence ┃
┠----------+---------------┨
┃ Checksum | Length ┃
┠----------+---------------┨
┃ Network Mask ┃
┠--------------------------┨
┃ Attached Router ┃
┠--------------------------┨
┃ ... ┃
┠--------------------------┨
┃ Attached Router ┃
┗--------------------------┛
OSPFv2 Network/ASBR Summary LSA
┃ 8bit | 8bit | 8bit | 8bit ┃
┏-------------+--------+----------┓
┃ Age | Option | Type=3/4 ┃
┠-------------+--------+----------┨
┃ Link State ID ┃
┠---------------------------------┨
┃ Advertising Router ┃
┠---------------------------------┨
┃ Sequence ┃
┠-------------+-------------------┨
┃ Checksum | Length ┃
┠-------------+-------------------┨
┃ Network Mask ┃
┠------+--------------------------┨
┃ 0x00 | Metric ┃
┠------+--------------------------┨
┃ Tos | Tos Metric ┃
┠------+--------------------------┨
┃ ... ┃
┠------+--------------------------┨
┃ 0x00 | Metric ┃
┗---------------------------------┛
OSPFv2 Autonomous System External LSA
┃ 8bit | 8bit | 8bit | 8bit ┃
┏----------------+--------+--------┓
┃ Age | Option | Type=5 ┃
┠----------------+--------+--------┨
┃ Link State ID ┃
┠----------------------------------┨
┃ Advertising Router ┃
┠----------------------------------┨
┃ Sequence ┃
┠----------------+-----------------┨
┃ Checksum | Length ┃
┠----------------+-----------------┨
┃ Network Mask ┃
┠-+-------+------------------------┨
┃E|0000000| Metric ┃
┠-+-------+------------------------┨
┃ Forwarding Address ┃
┠----------------------------------┨
┃ External Route Tag ┃
┠-+-------+------------------------┨
┃E| Tos | Metric ┃
┠-+-------+------------------------┨
┃ Forwarding Address ┃
┠----------------------------------┨
┃ External Route Tag ┃
┠----------------------------------┨
┃ ... ┃
┠----------------------------------┨
┃ Network Mask ┃
┠-+-------+------------------------┨
┃E|0000000| Metric ┃
┠-+-------+------------------------┨
┃ Forwarding Address ┃
┠----------------------------------┨
┃ External Route Tag ┃
┗----------------------------------┛
E:External Metric bit:0(E1)/1(E2)
OSPFv2 Not-So-Stubby Area External LSA
┃ 8bit | 8bit | 8bit | 8bit ┃
┏----------------+--------+--------┓
┃ Age | Option | Type=5 ┃
┠----------------+--------+--------┨
┃ Link State ID ┃
┠----------------------------------┨
┃ Advertising Router ┃
┠----------------------------------┨
┃ Sequence ┃
┠----------------+-----------------┨
┃ Checksum | Length ┃
┠----------------+-----------------┨
┃ Network Mask ┃
┠-+-------+------------------------┨
┃E| Tos | Metric ┃
┠-+-------+------------------------┨
┃ Forwarding Address ┃
┠----------------------------------┨
┃ External Route Tag ┃
┠----------------------------------┨
┃ ... ┃
┠----------------------------------┨
┃ Network Mask ┃
┠-+-------+------------------------┨
┃E| Tos | Metric ┃
┠-+-------+------------------------┨
┃ Forwarding Address ┃
┠----------------------------------┨
┃ External Route Tag ┃
┗----------------------------------┛
E:External Metric bit:0(E1)/1(E2)
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