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Also Generalize Backup Designated Router for Biconnected Redundancy In an OSPF broadcast network, a BDR is added for redundancy. The adjacencies of the DR and BDR form a biconnected subgraph. Each non-DR/BDR node is adjacent with the DR and the BDR. In a multihop wireless network, BDRs can be added so that each node is a neighbor of at least two DR/BDR nodes. Additional adjacencies can then be added to form a biconnected subgraph. Each non-DR/BDR node is adjacent with one DR and one BDR (or a 2nd DR). The DR/BDR selection and adjacencies shown in the example were computed by the proposed Essential CDS algorithm. |