OSPF: Difference between revisions - Network Security Wiki

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;Type 2 - Network LSAs

Generated by the DR on a multi access segment

Represents the pseudonode (~~designated router~~) for a multiaccess link.

Represents the pseudonode(DR) for a multiaccess link.

Provides similar information to an LSA type 1 for the multi access segment and subnet which it belongs

;Type 3 - Network Summary LSA / ABR Summary Route

Generated by ABRs

Contain the subnets & costs ~~but omit the topological data from all subnets in one area and sent to another area via the ABR~~

Contain the subnets & costs

Omit the topological data from all subnets in one area and sent to another area via the ABR

;Type 4 - ASBR summary LSA / ASBR Location

Injected by an ABR into the backbone to advertise the presence of an ASBR within an area

Generated by ___

Represents ASBRs

Represents ASBRs and are identical in structure to a type 3 LSA and sent when crossing an AS boundary

Identical in structure to a type 3 LSA

;Type 5 - AS external LSA / ASBR Summary Route

Generated by ASBRs

~~Describe~~ a route external to ~~the~~ OSPF ~~domain~~

Flooded throughout the AS to advertise a route external to OSPF

;Type 7 - NSSA External LSA

Generated by the ASBR in an NSSA area

Used in stub areas in place of a type 5 LSA.

Converted into a type 5 LSA by the ABR when leaving the area

* LSA as per Areas<ref>www.ericsson.com/in</ref>:-