OSPF DROther Routers
Question
On an Ethernet segment, OSPF DROther routers form which type of adjacency with each other?
Answers
Explanations
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On an Ethernet segment, OSPF DROther routers form a 2Way adjacency with each other.
In OSPF, routers on a shared network segment elect a designated router (DR) and a backup designated router (BDR) to act as a hub for exchanging link-state information. All other routers on the segment become DROthers, which only exchange information with the DR and BDR.
The 2Way adjacency is the first stage of forming a neighbor relationship between OSPF DROther routers on a shared network segment. In this stage, the routers exchange hello packets to establish bidirectional communication and to confirm that they are on the same subnet.
Once the 2Way adjacency is established, the routers move on to the next stage, called the ExStart stage. In this stage, the DR and BDR initiate the exchange of database description (DBD) packets with the DROthers to synchronize their link-state databases.
After the ExStart stage, the routers move on to the Exchange stage, where they exchange link-state request (LSR) packets and link-state update (LSU) packets to exchange detailed information about their network topology.
Finally, if all goes well, the routers establish a Full adjacency, where they have synchronized their link-state databases and are ready to exchange routing updates with each other.
In summary, on an Ethernet segment, OSPF DROther routers form a 2Way adjacency with each other before moving on to the ExStart, Exchange, and Full stages of neighbor relationship establishment.
