How will EIGRPv6 react if there is an IPv6 subnet mask mismatch between the Global Unicast addresses on a point-to-point link?

Question

Options

• AEIGRPv6 will form a neighbor relationship.
• BEIGRPv6 will not form a neighbor relationship.
• CEIGRPv6 will form a neighbor relationship, but with the log MSG: "EIGRPv6 neighbor not on a
• DEIGRPv6 will form a neighbor relationship, but routes learned from that neighbor will not be

• A
  83% (39)
• B
  2% (1)
• C
  11% (5)
• D
  4% (2)

Explanation

EIGRPv6 uses IPv6 link-local addresses (not global unicast addresses) to form neighbor adjacencies and exchange hello packets. Because the neighbor relationship is established over link-local addresses, a mismatch in the prefix length (subnet mask) of the global unicast addresses configured on a point-to-point link has no effect on EIGRPv6 neighbor formation. The routers will still exchange hellos over their link-local addresses and successfully bring up the adjacency. This is a key behavioral difference from EIGRPv4, where subnet mask mismatches on the interface addresses prevent neighbor relationships from forming.

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