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Difficulty: MediumOSPFv2 Neighbor Adjacencies and Router ID

During the OSPFv2 ExStart neighbor state, routers exchange initial Database Description (DBD) packets to establish a master-slave relationship. Which router attribute is compared to elect the master router?

Answer: Router ID / OSPF Router ID / router id / Router-ID / router-id / The Router ID / the router id

Answer

Router ID (the router with the numerically higher OSPF Router ID is elected as the master).
In the OSPF ExStart neighbor state, routers exchange empty Database Description (DBD) packets to decide which router controls the packet sequence numbers (the master). The router with the higher OSPF Router ID is elected master.

Step-by-Step Solution

1
Identify the neighbor state and process described in the prompt.
The scenario refers to the ExStart state where routers negotiate master/slave roles using DBD packets.
ExStart is designed to establish sequence numbers and determine control over database exchange.
2
Determine the parameter used to break ties and elect the master router.
The router with the higher OSPF Router ID is selected as the master.
OSPF specifies that the router possessing the highest Router ID acts as master to initiate DBD sequence numbering.

Key Concept

OSPFv2 Master/Slave Election during ExStart State
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Topics

OSPFv2 Neighbor Adjacencies and Router ID

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