300-410 Question 192
Single answerA network engineer is configuring EIGRP for IPv6 on a router in a dynamic environment. They want to simplify the configuration process by avoiding manual neighbor configuration while ensuring that EIGRP neighbors are dynamically discovered. Which command should the engineer use to achieve this?
- A
ipv6 eigrp neighbor
- B
eigrp router-id
- C
eigrp stub
- D
no eigrp neighbor
Show answer and explanation
Correct answer: D
Explanation
Dynamic neighbor discovery in EIGRP is achieved by using multicast packets to communicate with neighboring routers. By default, EIGRP uses this mechanism, but if static neighbors have been configured (through 'ipv6 eigrp neighbor'), this dynamic behavior is overridden. To re-enable dynamic neighbor discovery, the 'no eigrp neighbor' command is used, ensuring that EIGRP uses multicast traffic for neighbor discovery rather than static definitions.
- A. Incorrect.
This command is used to statically configure an EIGRP neighbor in IPv6, which is the opposite of dynamic neighbor discovery. It requires manually specifying the neighbor's IPv6 address.
- B. Incorrect.
This command is used to configure the router's EIGRP router ID and does not impact the discovery of dynamic neighbors.
- C. Incorrect.
This command configures the router as an EIGRP stub, which limits the routes advertised by the router but does not influence neighbor discovery.
- D. Correct.
This command ensures that the router relies on multicast packets to dynamically discover EIGRP neighbors instead of using manually configured static neighbors.