Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 364

www.dell.com | support.dell.com Figure 20-3. 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, you can designate up to 8,000 routes as external and up to 2,000 designated as inter/intra area routes. FTOS version 7.8.1.0 and later supports multiple OSPF processes (OSPF MP). The MXL Switch supports up to 16 processes simultaneously. FTOS supports SA, Totally Stub (No Summary), and NSSAs and supports the following LSAs, as described earlier in this document. • Router (type 1) • Network (type 2) • Network Summary (type 3) • AS Boundary (type 4) • AS External (type 5) • NSSA External (type 7) 362 | Open Shortest Path First (OSPFv2)