Configuring OSPFv3 Areas

A large network scale leads to a huge LSDB size, causes routers to consume much storage space, affects network performance. To prevent these problems, you can configure OSPFv3 to divide an AS to different areas

Configuring OSPFv3 Stub Areas: A stub area is a special area in which ABRs do not flood the received AS external routes. Therefore, the number of LSAs is greatly reduced.

Configuring OSPFv3 NSSAs: Derived from a stub area, an NSSA allows AS external routes to be imported; an ASBR advertises Type 7 NSSA LSAs in the local NSSA.

Configuring OSPFv3 Virtual Links: In certain cases, the direct physical connection between a backbone area and a non-backbone area can hardly be realized. Thus, you can configure virtual links for the ABR that is not directly connected to the backbone area. Virtual links are mainly used for redundancy backups. The other ends of virtual links also need corresponding configurations.