Network

OSPFv3 LSA Message Format

OSPFv3 Protocol LSA Header

  • OSPFv3 Router LSA
  • OSPFv3 Network LSA
  • OSPFv3 Inter-Area Prefix LSA
  • OSPFv3 Inter-Area Router LSA
  • OSPFv3 AS External LSA
  • OSPFv3 Link LSA
  • OSPFv3 Intra-Area Prefix LSA
    Prefix Option

OSPFv3 Protocol LSA Header

┃ 16bit    | 16bit   ┃
┏----------+---------┓
┃ Age      | Type    ┃
┠----------+---------┨
┃ Link State ID      ┃
┠--------------------┨
┃ Advertising Router ┃
┠--------------------┨
┃ Sequence           ┃
┠----------+---------┨
┃ Checksum | Length  ┃
┗----------+---------┛

Link State Type

┏---+----+----+-------------------┓
┃ U | S2 | S1 | LSA Function Code ┃
┗---+----+----+-------------------┛
S2 S1 Flooding Diffusion Ranger
0 0 链路本地
0 1 区域
1 0 AS
1 1 Reserved
Type OSPFv3 Type Name Type OSPFv2 Type Name Command
0x2001 Router LSA 1 Router LSA show ip ospf database router
0x2002 Network LSA 2 Network LSA show ip ospf database network
0x2003 Inter-Area Prefix LSA 3 Network Summary LSA show ip ospf database summary
0x2004 Inter-Area Router LSA 4 ASBR Summary LSA show ip ospf database asbr-summary
0x4005 AS External LSA 5 AS External LSA show ip ospf database external
0x2006 Group Membership 6 Group Membership LSA
0x2007 Type7 LSA 7 NSSA External LSA show ip ospf database nssa-external
0x0008 Link LSA no corresponding LSA
0x2009 Intra-Area Prefix LSA no corresponding LSA

OSPFv3 Router LSA

┃ 8bit           | 8bit |    16bit    ┃
┏-----------------------+-------------┓
┃ Age                   | Type=0x2001 ┃
┠-----------------------+-------------┨
┃ Link State ID                       ┃
┠-------------------------------------┨
┃ Advertising Router                  ┃
┠-------------------------------------┨
┃ Link State Sequence                 ┃
┠-----------------------+-------------┨
┃ Link State Checksum   | Length      ┃
┠------+---------+------+-------------┨
┃ 0000 | W|V|E|B | Option             ┃ 
┠------+---------+------+-------------┨
┃ Interface Type | 0x00 | Metric      ┃
┠----------------+------+-------------┨
┃ 实例 ID                             ┃
┠-------------------------------------┨
┃ Neighbor Interface ID               ┃
┠-------------------------------------┨
┃ Neighbor Router ID                  ┃
┠-------------------------------------┨
┃                 ...                 ┃
┠----------------+------+-------------┨
┃ Interface Type | 0x00 | Metric      ┃
┠----------------+------+-------------┨
┃ 实例 ID                             ┃
┠-------------------------------------┨
┃ Neighbor Interface ID               ┃
┠-------------------------------------┨
┃ Neighbor Router ID                  ┃
┗-------------------------------------┛
Interface Type Link connected to:
1 another Router (point-to-point)
2 a Transit Network
3 Reserved
4 virtual link

OSPFv3 Network LSA

┃ 8bit | 8bit |    16bit    ┃
┏-------------+-------------┓
┃ Age         | Type=0x2002 ┃
┠-------------+-------------┨
┃ Link State ID             ┃
┠---------------------------┨
┃ Advertising Router        ┃
┠---------------------------┨
┃ Link State Sequence       ┃
┠-------------+-------------┨
┃ Checksum    | Length      ┃
┠------+------+-------------┨
┃ 0x00 | Option             ┃ 
┠------+--------------------┨
┃ Attached Router           ┃
┠---------------------------┨
┃           ...             ┃
┠---------------------------┨
┃ Attached Router           ┃
┗---------------------------┛

OSPFv3 Inter-Area Prefix LSA

┃ 8bit          | 8bit          |    16bit    ┃
┏-------------------------------+-------------┓
┃ Age                           | Type=0x2003 ┃
┠-------------------------------+-------------┨
┃ Link State ID                               ┃
┠---------------------------------------------┨
┃ Advertising Router                          ┃
┠---------------------------------------------┨
┃ Link State Sequence                         ┃
┠-------------------------------+-------------┨
┃ Checksum                      | Length      ┃
┠---------------+---------------+-------------┨
┃ 0x00          | Metric                      ┃
┠---------------+---------------+-------------┨
┃ Prefix Length | Prefix Option | 0x0000      ┃
┠---------------+---------------+-------------┨
┃ IPaddr Prefix                               ┃
┃ ...                                         ┃
┗---------------------------------------------┛

OSPFv3 Inter-Area Router LSA

┃ 8bit | 8bit |    16bit    ┃
┏-------------+-------------┓
┃ Age         | Type=0x2004 ┃
┠-------------+-------------┨
┃ Link State ID             ┃
┠---------------------------┨
┃ Advertising Router        ┃
┠---------------------------┨
┃ Link State Sequence       ┃
┠-------------+-------------┨
┃ Checksum    | Length      ┃
┠------+------+-------------┨
┃ 0x00 | Option             ┃
┠------+--------------------┨
┃ 0x00 | Metric             ┃
┠------+--------------------┨
┃ Destination Router ID     ┃
┗---------------------------┛
Destination Router ID:ASBR's RID

OSPFv3 AS External LSA

┃ 8bit          | 8bit          |    16bit       ┃
┏-------------------------------+----------------┓
┃ Age                           | Type=0x4005    ┃
┠-------------------------------+----------------┨
┃ Link State ID                                  ┃
┠------------------------------------------------┨
┃ Advertising Router                             ┃
┠------------------------------------------------┨
┃ Link State Sequence                            ┃
┠-------------------------------+----------------┨
┃ Checksum                      | Length         ┃
┠---------------+---------------+----------------┨
┃ 00000 | E|F|T | Metric                         ┃
┠---------------+---------------+----------------┨
┃ Prefix Length | Prefix Option | Interface Type ┃
┠---------------+---------------+----------------┨
┃ IPaddr Prefix                                  ┃
┃ ...                                            ┃
┠------------------------------------------------┨
┃ Transit IPaddr (if F=1)                        ┃
┠------------------------------------------------┨
┃ External Route Tag (if T=1)                    ┃
┠------------------------------------------------┨
┃ Reference Link State ID (option)               ┃
┗------------------------------------------------┛
E:External Metric bit:0(E1)/1(E2)

┃ 8bit          | 8bit            |    16bit    ┃
┏---------------------------------+-------------┓
┃ Age                             | Type=0x0008 ┃
┠---------------------------------+-------------┨
┃ Link State ID                                 ┃
┠-----------------------------------------------┨
┃ Advertising Router                            ┃
┠-----------------------------------------------┨
┃ Link State Sequence                           ┃
┠---------------------------------+-------------┨
┃ Checksum                        | Length      ┃
┠-----------------+---------------+-------------┨
┃ Router Priority | Option                      ┃
┠-----------------+-----------------------------┨
┃ 链路本地 Prefix地址                          ┃
┃ ...                                           ┃
┠-----------------------------------------------┨
┃ Number of Prefix                              ┃
┠-----------------+---------------+-------------┨
┃ Prefix Length   | Prefix Option | 0x0000      ┃
┠-----------------+---------------+-------------┨
┃ IPaddr Prefix                                 ┃
┃ ...                                           ┃
┠-----------------------------------------------┨
┃ ...                                           ┃
┠-----------------------------------------------┨
┃ Number of Prefix                              ┃
┠-----------------+---------------+-------------┨
┃ Prefix Length   | Prefix Option | 0x0000      ┃
┠-----------------+---------------+-------------┨
┃ IPaddr Prefix                                 ┃
┃ ...                                           ┃
┗-----------------------------------------------┛

OSPFv3 Intra-Area Prefix LSA

┃ 8bit          | 8bit          | 16bit                     ┃
┏-------------------------------+---------------------------┓
┃ Age                           | Type=0x2009               ┃
┠-------------------------------+---------------------------┨
┃ Link State ID                                             ┃
┠-----------------------------------------------------------┨
┃ Advertising Router                                        ┃
┠-----------------------------------------------------------┨
┃ Link State Sequence                                       ┃
┠-------------------------------+---------------------------┨
┃ Checksum                      | Reference Link State Type ┃
┠-------------------------------+---------------------------┨
┃ Reference Link State ID                                   ┃
┠-----------------------------------------------------------┨
┃ Reference Advertising Router                              ┃
┠---------------+---------------+---------------------------┨
┃ Prefix Length | Prefix Option | Metric                    ┃
┠---------------+---------------+---------------------------┨
┃ IPaddr Prefix                                             ┃
┃ ...                                                       ┃
┠-----------------------------------------------------------┨
┃ ...                                                       ┃
┠---------------+---------------+---------------------------┨
┃ Prefix Length | Prefix Option | Metric                    ┃
┠---------------+---------------+---------------------------┨
┃ IPaddr Prefix                                             ┃
┃ ...                                                       ┃
┗-----------------------------------------------------------┛

Prefix Option

┏-+-+-+-+---+----+----+----┓
┃ | | | | P | MC | LA | NU ┃
┗-+-+-+-+---+----+----+----┛

P :Propagate,传播位
MC:MultiCast,多播位
LA:Local Address,本地地址位
NU:No Unicast,无单播位