ospf-3----Page:32
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
|
Adjacency Maintenance Forming biconnected adjacencies: Each (Backup) MDR forms an adjacency with each neighboring (Backup) MDR that is (Backup) Dependent, providing a biconnected backbone. Each MDR Other forms an adjacency with its (Backup) MDR Parent, creating a biconnected adjacency graph. Forming uniconnected adjacencies: omit “Backup” in the above Existing adjacency: Maintain as long as either the router itself or the neighbor is a (Backup) MDR. Otherwise it is torn down. MDR TLV: To form new adjacencies more quickly in mobile networks, initialization DD packets include the MDR Parent and Backup MDR Parent of the sending router. Database Exchange Optimization: A router (master or slave) performing database exchange does not include an LSA header in its DD packets if it knows the neighbor has the same or newer instance of the LSA. Reduces DD packet overhead by about 50%. |