OSPF LSA in Details

Somedays before (last year), I have published a post about the OSPF LSAs types and definitions. Today I am going to share some more details about the SLAs as which router will generate the which LSAs:

1. 

SLA Name: Router LSA 

Link-State ID: Originating router ID of the router

Generated By: Router LSAs are generated by every router. 

2. 

SLA Name: Network LSA 

Link-State ID: Interface IP address of the DR

Generated By: Network LSAs are generated by the DR on a multi-access segment. They are the representation of the multi-access segment and all the routers attached to the segment. Segments that do not have a DR, such as point-to-point, will not have a network LSA.

3.

SLA Name: Network summary LSA

Link-State ID: Destination network number

Generated By: Network summary LSAs are generated by ABRs. 

4.

SLA Name: ASBR summary LSA

Link-State ID: Router ID of AS boundary router

Generated By: ASBR summary LSAs are also generated by the ABR. This LSA describes the location of an ASBR, not a network. 

5. 

SLA Name: AS external LSA

Link-State ID: External network number

Generated By: Autonomous System (AS) External LSAs are originated by the ASBRs and describe a network outside of the AS.

7. 

SLA Name: NSSA external LSA
Link-State ID: External network number
Generated By: Not-So-Stubby Area (NSSA) external LSAs are originated by the ASBR within the NSSA. These types of LSAs are flooded only throughout the NSSA.

I hope it will very helpful for you!