Mobile Ad Hoc Networks

166  ◾  Mobile Ad Hoc Networks: Current Status and Future Trends

When determining the dominating set, OSPF MDR and OSPF OR/SP utilize the algorithm

suggested by OLSR to create a local CDS of relaying nodes. OSPF MDR uses its own different

method to create a global CDS, known as the backbone.

Each extension performs retransmission differently. OSPF MPR has the most straightforward

approach in which the sending router retransmits if the LSA is not acknowledged. On the other

end of the spectrum, in OSPF OR/SP, any nonactive (not selected) OR is eligible for retransmis-

sion. In OSPF MDR, specific BMDRs are selected to perform retransmission.

In terms of adjacency reduction, OSPF MPR creates adjacencies between MPRs and MPR

selectors. Similarly, in ...