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Difficulty: EasyOSPFv2 Network Types and DR/BDR Selection

A network administrator configures the command `ip ospf priority 0` on a router's Ethernet interface connected to a broadcast multiaccess network. Which behavior will this router exhibit during OSPF DR and BDR elections on this segment?

  1. The router is completely excluded from participating in DR and BDR elections on the interface.Answer
  2. B
    The router will become the Designated Router if its Router ID is higher than all neighboring routers.
  3. C
    The router immediately preempts the active Designated Router and triggers a new election.
  4. D
    The router defaults to becoming the Backup Designated Router instead of the Designated Router.

Answer

The router is completely excluded from participating in DR and BDR elections on the interface.
In OSPFv2 broadcast and non-broadcast multiaccess networks, setting the interface priority to 0 prevents the router from participating in the DR/BDR election. The router will always remain a DROther on that segment.

Step-by-Step Solution

1
Analyze the interface configuration command
The command `ip ospf priority 0` sets the OSPF router priority for the specific interface to zero.
In OSPFv2, interface priority determines candidate eligibility for DR/BDR election on multiaccess networks.
2
Evaluate the effect of a priority value of 0
A priority value of 0 explicitly disqualifies the interface from becoming either the Designated Router (DR) or Backup Designated Router (BDR).
Routers with priority 0 remain in the DROther state regardless of their Router ID, loopback addresses, or physical IP addresses.

Key Concept

OSPF Interface Priority 0 Election Disqualification
Estimated Time:45s
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Topics

OSPFv2 Network Types and DR/BDR Selection

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