In OSPF broadcast networks, the primary factor for electing the Designated Router (DR) is the interface priority value assigned to each router. The router with the highest interface priority becomes the DR. If multiple routers have the same highest priority, the router with the highest Router ID is selected. Interface priority is configurable and allows network administrators to influence DR election, making it the most significant criterion in the selection process.
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Cisco CCNA 200-301
IP Connectivity
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