8 Proposed Configuration (2/3) RP is the address of the UDL interface of the feed router Receivers in receive network never to switch to SPT Configure the networks so receive networks reach RP through the UDL Join path uses UDL
9 Proposed Configuration (3/3) Item –If using routing protocol –Cost of the unidirectional link interface of receive routers is not to be huge –Re-compute interface costs of routers achieve routing config. as the previous slide minimize the number of re-computed interfaces –A rule of thumb to configure interface costs for a more general network topology
10 A Rule of Thumb for Interface Costs V is a constant
11 Determining V Set V such that V is the determinant of inter-network path selection V > 2*max(rc(R,U)-rc(R,B), rc(X2,R) – rc(Y2-R), …) Placing U and B on one subnet simplifies our life.