OSPF Intra area Filtering / Type 1 LSA Filtering | Layer 3 Switching
OSPF Inter-Area Routing - Cisco
OSPF inter-area and intra-area routing rules | CCIE, the beginning!
11.0 Avoiding DRs and "neighbor" command on NBMA Different methods can be used to avoid the complications of configuring static neighbors and having specific routers becoming DRs or BDRs on the non-broadcast cloud. Specifying which method to use ...