Company XYZ plans to run OSPF on a DMVPN network. They want to use spoke-to-spoke tunnels in the design. What is a drawback or concern in this type of design?

The correct answer is D. Manual configuration of the spokes with the appropriate priority will be needed. Split Horizon is EIGRP’s loop prevention mechanism. Distance Vector protocols also use Split Horizon for loop prevention. If you’re going to use OSPF, make sure that your hubs are the DR and BDR. If you only have one hub, make it the DR, and don’t configure a BDR.The key point…

Designing Network Infrastructure

Question

Options

AAdditional host routes will be inserted into the routing tables.
BManual configuration of the spoke IP address on the hub will be needed.
CThere will be split-horizon issue at the hub.
DManual configuration of the spokes with the appropriate priority will be needed.

How the community answered

(41 responses)

A
7% (3)
B
12% (5)
C
5% (2)
D
76% (31)

Explanation

Split Horizon is EIGRP’s loop prevention mechanism. Distance Vector protocols also use Split Horizon for loop prevention. If you’re going to use OSPF, make sure that your hubs are the DR and BDR. If you only have one hub, make it the DR, and don’t configure a BDR.The key point here is that the spokes should never be elected as DR or BDR. You can enforce this with ip ospf priority 0.

Topics

#DMVPN#OSPF#spoke-to-spoke#DR/BDR election

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