EIGRP on IPv6 Devices

B

EIGRP (Enhanced Interior Gateway Routing Protocol) is a routing protocol that supports both IPv4 and IPv6 networks. When configuring EIGRP on IPv6 devices, there are some differences from the way it is configured on IPv4 devices.

A. The configuration uses process numbers: The statement is true. EIGRP on IPv6 devices uses process numbers to differentiate between different EIGRP instances. Process numbers are used in the EIGRP router configuration command, which is "ipv6 router eigrp [process number]." The process number must match on all devices that are running EIGRP on the same network segment.

B. It is configured directly on the interface: The statement is false. EIGRP is not configured directly on the interface on either IPv4 or IPv6 devices. Instead, it is configured under the router process using the "ipv6 router eigrp" command.

C. The configuration uses secondary IP addresses: The statement is false. EIGRP on IPv6 devices does not use secondary IP addresses. Instead, each interface is configured with a primary IPv6 address, and EIGRP uses that address for routing.

D. The neighbors of each device are directly configured: The statement is false. EIGRP on IPv6 devices uses multicast to discover neighboring routers. When a new router running EIGRP is connected to the network, it sends a multicast message to all other routers on the same network segment to announce its presence. Other routers running EIGRP respond to the multicast message and become neighbors with the new router.

In summary, the only true statement about EIGRP on IPv6 devices is that it uses process numbers to differentiate between different EIGRP instances.