Reference Guide

Router Priority and Cost
Router priority and cost is the method the system uses to “rate” the routers.
For example, if not assigned, the system selects the router with the highest priority as the DR. The second highest priority is the
BDR.
● Priority is a numbered rating 0 to 255. The higher the number, the higher the priority.
● Cost is a numbered rating 1 to 65535. The higher the number, the greater the cost. The cost assigned reflects the cost
should the router fail. When a router fails and the cost is assessed, a new priority number results.
Figure 94. Priority and Cost Examples
OSPF Implementation
The Dell Networking OS supports up to 10,000 OSPF routes for OSPFv2. Within the 10,000 routes, you can designate up to
8,000 routes as external and up to 2,000 as inter/intra area routes.
Multiple OSPF processes (OSPF MP) are supported on OSPFv2 only; up to 32 simultaneous processes are supported.
On OSPFv3, the system supports only one process at a time for all platforms.
OSPFv2 and OSPFv3 can coexist on a switch, but you must configure them individually.
The system supports stub areas, totally stub (no summary) and not so stubby areas (NSSAs) and supports the following LSAs:
● Router (type 1)
● Network (type 2)
● Network Summary (type 3)
● AS Boundary (type 4)
● LSA(type 5)
● External LSA (type 7)
● Link LSA, OSPFv3 only (type 8)
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Open Shortest Path First (OSPFv2 and OSPFv3)