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Difficulty: EasyOSPFv2 Network Types and DR/BDR Selection

A network administrator configures the interface command `ip ospf priority 0` on a router's GigabitEthernet interface connected to a broadcast multiaccess Ethernet network. What is the effect of setting the OSPF priority to 0 on this interface?

  1. The router becomes completely ineligible to be elected as a Designated Router (DR) or Backup Designated Router (BDR).Answer
  2. B
    The router is assigned the highest election precedence and will immediately become the Designated Router.
  3. C
    The router will participate in the election, and its highest loopback IP address will break any priority ties.
  4. D
    The interface automatically transitions its OSPF network type from broadcast to point-to-point.

Answer

The router becomes completely ineligible to be elected as a Designated Router (DR) or Backup Designated Router (BDR).
In OSPFv2 broadcast networks, setting the interface priority to 0 explicitly disables the router from participating in Designated Router (DR) or Backup Designated Router (BDR) elections. The router will remain in the DROTHER state for that segment regardless of its Router ID or IP addresses.

Step-by-Step Solution

1
Identify the function of OSPF interface priority on multiaccess networks.
Interface priority (default value of 1) determines candidate preference during DR and BDR elections.
OSPF uses priority values ranging from 0 to 255 to control router roles on broadcast segments.
2
Evaluate the special meaning of priority value 0.
A priority setting of 0 forces the interface into a DROTHER state, preventing it from ever becoming a DR or BDR.
By OSPF design, priority 0 indicates non-participation in election roles.

Key Concept

OSPF Priority 0 DR/BDR Election Exclusion
Estimated Time:45s
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Topics

OSPFv2 Network Types and DR/BDR Selection

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