Dell Force10 MXL Blade - Implementing OSPF with FTOS

362 | Open Shortest Path First (OSPFv2)
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Figure 20-3. Priority and Costs Example
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)
Router 1
Priority 200
Cost 21
Router 2
Priority 180
Cost 50
Router 3
Priority 100
Cost 25
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 from R1s priority
number. R1s new priority is 179.
R2 as both the selected BDR and the now-highest
priority, becomes the DR.
If R3 fails, the system subtracts 50 from its priority.
R2s new priority is 130.
R4 is now the highest priority and becomes the DR.