ccna ipv6

ccna ipv6.3 Network Summary The LSA (0IA) is generated by the ABR and it advertises the network within a region to other regions in the OSPF autonomous system. These entries are diffused through the backbone area to other ABRO link state IDs for the address of the target network.4 ASBR Summary LSA (0IA) Generated by the ABR to describe reachability to the ASBR and sent from the backbone region to other ABRs. the link state ID is the ASBR router ID.5 External LSA (0E1 or E2) Generated by the ASBR and contains information about links outside the autonomous system. The link state ID is the address of the external network.7 NSSA External LSA (0N1 or N2) Generated by the ASBR with information about the NSSA that can be spread within the NSSA area , the ABR can convert an LSA of type 7 to an LSA of type 5 o The link state ID is the address of the external network.Chapter 17 OSPF .305 .17.1.10 OSPF Area TypesOSPF areas use a two-level structure, and the characteristics set by an area control the type of link state information it can receive. The key to distinguishing the different OSPF area types is how they handle routing outside the area. OSPF area types are described below.1 Standard area: can receive link update information, routes to the same area, inter-area routes, and routes from external ASes. Standard areas are usually connected to area 0.2 Trunk area: a central entity that connects the areas and allows for fast and efficient transmission of IP packets, and to which all other areas are connected to exchange routing information. The backbone area is also called area 0.3 StubArea: Does not receive routing information from external autonomous systems.