CCNP - ENTERPRISE - Study pointers - OSPF

My notes study notes for OSPF:

• When configuring a virtual link you specify the are to be traversed plus the Router I.D. of the end point.
•  e.g. - R1(config-router)#area 5 virtual link 3.3.3.3
•  Then on remote router: R3(config-router)#area 5 virtual-link 1.1.1.1

• When working on a Frame-relay environment you need to enter the network type cmd under the OSPF process:
• R2(config-router)#ip ospf network non-broadcast
• At the interface you need to set OSPF priority to prevent DR election on the routers that will not be a DR:
• R2(config-if)#ip ospf priority 0

• An INIT state can exist when a router ID has not been seen in a received Hello Packet
• A Stub area doesn't accept information from outside of the OSPF AS
• ABR's maintain a separate link-state database for each area they are attached to.