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How is the designated router (DR) determined by OSPF on a multi-access network segment?
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The highest interface priority, then the highest RID
OSPF routers elect a designated router (DR) and backup designated router (BDR) on multi-access network segments, in order to minimize the amount of update traffic sent between OSPF neighbors. All routers on a multi-access network segment form adjacencies with the DR and BDR, but not with each other. Network events are communicated to the DR, and the DR distributes the event to the rest of the network. The DR is determined by the router with the highest interface priority number. If the priority numbers tie, then the router with the highest router ID (RID) becomes the DR. The default priority number is 1, and can be configured as high as 255. Changing the priority to 0 makes the router ineligible to become the DR or BDR. The ip ospf priority # command is used to manually configure a priority on a specific interface. The lowest interface priority does not determine the DR. The OSPF process ID has no effect on DR elections. |
