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Difficulty: EasyOSPFv2 Neighbor Adjacencies and Router ID

An engineer is troubleshooting an OSPFv2 neighbor adjacency issue between two directly connected routers. Which two parameters must match on the interconnecting interfaces for an OSPFv2 neighbor relationship to successfully form? (Select TWO.)

  1. Area IDAnswer
  2. Hello and Dead timer intervalsAnswer
  3. C
    OSPF Process ID
  4. D
    OSPF Router ID

Answer

The parameters that must match for OSPFv2 neighbor adjacency formation are Area ID and Hello and Dead timer intervals.
For two routers to establish an OSPFv2 neighbor adjacency, several parameters exchanged in Hello packets must match: Area ID, Hello and Dead timers, subnet mask/subnet ID, and authentication settings. Area ID and Hello/Dead timers are mandatory matching parameters.

Step-by-Step Solution

1
Identify OSPFv2 Hello packet parameter requirements for neighbor formation.
OSPF Hello packets contain parameters that must match (Area ID, Subnet Mask, Hello/Dead timers, Authentication, MTU) and parameters that must be unique (Router ID).
Matching parameters ensure both routers agree on common network boundaries and operational timings.
2
Evaluate local vs global OSPF settings.
The OSPF Process ID is locally significant to the router, and the Router ID must be unique per router.
Process IDs do not affect protocol negotiation across links, while duplicate Router IDs cause protocol conflicts.

Key Concept

OSPFv2 Neighbor Adjacency Requirements
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Topics

OSPFv2 Neighbor Adjacencies and Router ID

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