Ospf lsa notes

Ospf lsa notes
In AS, routers generate lsa based on classification, and las sets form lsdb. The routing descriptions in ospf are encapsulated in lsa. Router lsa (1): it is generated when no vro is available. It describes the link status and cost of the vro and transmits the Network lsa in the region (2). It is generated by dr, describes the link status of this segment, which is transmitted within the region. Network summary lsa (3): it is generated by the abr, describes the route of a Network segment in the region, and notifies Asbr summary lsa (4) in other related regions: it is generated by the abr, describe the route to the asbr and advertise it to other relevant regions except the region where the asbr is located. As external lsa (5): A route generated by the asbr that describes the routes outside the AS and advertised to all regions (except stub and nssa regions) Nssa lsa (7): generated by the asbr, a route that is described outside of the AS. It is only transmitted in The nssa region. The difference between Stub and totally stub: routes outside of the AS are not propagated in the stub region, and all routes are not propagated in the totallystub region.