BSCI Exam Cram™ 2 (Exam 642-801)

OSPF Operation in a Multiple-Area NBMA Environment

OSPF activities across multiple areas include operations such as creating link information, flooding techniques, and routing table construction. If a packet is heading for an intra-area network, it will be forwarded from an internal router to the destination router within the single area. Refer to the Type 1 and Type 2 LSAs for Area 1, as shown in Figure 5.3. However, as a packet needs to exit the area to another area, it follows these three steps:

1.	The packet is routed from the originating network to an area border router.
2.	The area border router transmits the packet through the transit area (backbone) to the ABR servicing the target network.
3.	The target area border router forwards the ...