Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 465
Implementing OSPF with FTOS, FTOS supports Stub areas
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Figure 24-3. Priority and Costs Example Router 2 Priority 180 Cost 50 Router 3 Priority 100 Cost 25 Router 1 Priority 200 Cost 21 Router 4 Priority 150 Cost 20 Router 1 selected by the system as DR. Router 2 selected by the system as BDR. If R1 fails, the system subtracts 21 fromR1 s priority number. R1 s new pirority is 179. R2 as both the selected BDR and the now-highest priority, 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. Implementing OSPF with FTOS FTOS supports up to 10,000 OSPF routes. Within that 10,000 up to 8,000 routes can be designated as external 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 and OSPFv3 can coexist but must be configured individually. FTOS supports Stub areas, Totally Stub (No Summary) and Not So Stubby Areas (NSSAs) and supports the 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) Open Shortest Path First (OSPFv2 and OSPFv3) | 465
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