Four OSPFv2 routers are connected to a shared multi-access Ethernet segment. Place the steps of the OSPF Designated Router (DR) election logic in the correct order of evaluation, from the initial eligibility filter to the final operational behavior.
- 1Exclude any interface configured with an OSPF priority of 0 from candidate eligibility.
- 2Select the router candidate with the highest OSPF interface priority value.
- 3Break priority ties by selecting the candidate router with the numerically highest OSPF Router ID.
- 4Enforce non-preemption by maintaining the active DR role even if a router with a higher priority boots later.
Cevap
The correct operational sequence is: Exclude routers with an OSPF priority of 0, select the candidate with the highest interface priority, break ties using the highest OSPF Router ID, and finally enforce non-preemption so an established DR remains active.
On multi-access broadcast networks, OSPF DR/BDR election begins by filtering out any router configured with priority 0. For remaining eligible routers, the router with the highest OSPF interface priority is preferred. If priorities are equal, the router with the highest Router ID breaks the tie. Once a DR is elected, the process is non-preemptive, meaning new routers joining the segment will not replace an active DR even if they have superior metrics.
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OSPFv2 DR/BDR Election Logic and Precedence Rules