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Difficulty: EasyOSPFv2 Network Types and DR/BDR Selection

An administrator connects a router interface to a broadcast multiaccess Ethernet network running OSPFv2. The administrator executes the command `ip ospf priority 0` under the interface configuration mode. How will this router participate in the OSPF Designated Router (DR) and Backup Designated Router (BDR) election on this segment?

  1. It becomes completely ineligible to serve as a DR or BDR.Answer
  2. B
    It will win the election if its Router ID is numerically higher than all other routers.
  3. C
    It will automatically be elected as the BDR regardless of physical interface IP address.
  4. D
    It defaults to acting as the DR unless another router has a manually configured priority of 255.

Answer

The router becomes completely ineligible to serve as a DR or BDR on the network segment.
Configuring `ip ospf priority 0` explicitly disables a router's eligibility to participate in Designated Router (DR) and Backup Designated Router (BDR) elections on multiaccess network types. The router will always remain in the DROTHER state for that interface segment.

Step-by-Step Solution

1
Evaluate the interface priority value
The command `ip ospf priority 0` sets the OSPF priority for the interface to 0.
In OSPFv2, interface priority determines DR/BDR election participation (default priority is 1).
2
Apply OSPF DR/BDR election rules for priority 0
A priority of 0 prevents the interface from ever becoming a DR or BDR.
Routers with a priority of 0 remain in the DROTHER state on multiaccess networks.

Key Concept

OSPF Interface Priority 0 Ineligibility
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Topics

OSPFv2 Network Types and DR/BDR Selection

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