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Difficulty: EasyOSPFv2 Network Types and DR/BDR Selection

A network administrator configures an OSPFv2 interface on a Multiaccess Ethernet network with the command `ip ospf priority 0`. What is the impact of this configuration on the DR/BDR election process on that segment?

  1. The router interface is completely excluded from becoming either a Designated Router (DR) or Backup Designated Router (BDR).Answer
  2. B
    The router interface will become the DR if it has a higher Router ID than all other routers on the multiaccess segment.
  3. C
    The router interface can only be elected as the Backup Designated Router (BDR) and cannot serve as the DR.
  4. D
    The router interface will immediately win the election because priority 0 is evaluated before numerical priorities 1 through 255.

Answer

The router interface is completely excluded from becoming either a Designated Router (DR) or Backup Designated Router (BDR).
In OSPFv2 multiaccess networks, setting an interface's priority to 0 explicitly revokes its eligibility to participate in DR and BDR elections. The interface remains in the DROTHER state and forms adjacencies only with the elected DR and BDR.

Step-by-Step Solution

1
Evaluate the function of OSPF interface priority values.
OSPF interface priority ranges from 0 to 255, where default priority is 1.
The priority value determines eligibility and preference during DR/BDR elections on broadcast multiaccess networks.
2
Analyze the specific behavior of priority 0.
Configuring `ip ospf priority 0` marks the interface as ineligible for DR/BDR roles.
A router with priority 0 will always transition directly to the DROTHER state upon adjacency establishment.

Key Concept

OSPF Interface Priority 0 and DR/BDR Ineligibility
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Topics

OSPFv2 Network Types and DR/BDR Selection

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