Open Shortest Path First (OSPFv2 and OSPFv3) | 699Figure 32-3. Priority and Costs ExampleImplementing OSPF with FTOSFTOS supports up to 10,000 OSPF routes. Within that 10,000 up to 8,000 routes can be designated asexternal and up to 2,000 designated as inter/intra area routes.FTOS version 7.8.1.0 and later support multiple OSPF processes (OSPF MP).Prior to 7.8.1.0, FTOS supports 1 OSPFv2 and 1 OSPFv3 process ID per system. Recall that OSPFv2 andOSPFv3 can coexist but must be configured individually.FTOS supports Stub areas, Totally Stub (No Summary) and Not So Stubby Areas (NSSAs) and supportsthe following LSAs, as discussed earlier in this document.• Router (type 1)• Network (type 2)• Network Summary (type 3)• AS Boundary (type 4)• AS External (type 5)Router 1Priority 200Cost 21Router 2Priority 180Cost 50Router 3Priority 100Cost 25Router 4Priority 150Cost 20Router 1 selected by the system as DR.Router 2 selected by the system as BDR.If R1 fails, the system subtracts 21 fromR1 s prioritynumber. R1 s new priority is 179.R2 as both the selected BDR and the now-highestpriority, becomes the DR.If R3 fails, the system subtracts 50 fromits priority.R2 s new priority is130.R4 is now the highest priority and becomes the DR.
