Understanding OSPFv3 LSA Types

ABD.

OSPFv3 (Open Shortest Path First version 3) is a routing protocol that is used to route IP packets in IPv6 networks. OSPFv3 uses different types of LSAs (Link State Advertisements) to advertise information about the network topology to other routers in the network.

The three LSA types used by OSPFv3 are:

A. Link LSA: This type of LSA is used to advertise information about the link-local addresses and state of each router interface. Link LSAs are flooded within a single link or area and are not forwarded beyond that area.

B. Intra-Area Prefix LSA: This type of LSA is used to advertise information about IPv6 prefixes within an OSPFv3 area. Intra-Area Prefix LSAs are flooded within the area and are not forwarded beyond that area.

C. Interarea-prefix LSA for ASBRs: This type of LSA is used to advertise information about IPv6 prefixes that are external to the OSPFv3 domain and are reachable via an Autonomous System Boundary Router (ASBR). Interarea-prefix LSAs are flooded between areas and are not forwarded beyond the OSPFv3 domain.

The other two LSA types that are used by OSPFv2 but not OSPFv3 are:

D. Autonomous system external LSA: This type of LSA is used to advertise information about external routes that are imported into OSPFv2 from another routing protocol or a static route.

E. Internetwork LSA: This type of LSA is used to advertise information about routers that are not directly connected to the backbone area in OSPFv2. The internetwork LSA is not used in OSPFv3.

In summary, OSPFv3 uses the Link LSA, Intra-Area Prefix LSA, and Interarea-prefix LSA for ASBRs. The Autonomous system external LSA and Internetwork LSA are used in OSPFv2 but not OSPFv3.