An engineer configures ipv6 route 2001:db8:dead::/48 fe80::1 on a router and the static route does not get installed. Why does this static route fail to install?
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Correct answer: Cisco requires the outgoing interface to be specified when the next-hop is a link-local IPv6 address.
Why this is the answer
Cisco IOS requires that when a link-local IPv6 address (like fe80::1) is used as the next-hop for a static route, the outgoing interface must also be specified. This is because link-local addresses are only unique on a specific link, so the router needs to know which interface to send the traffic out of to reach that next-hop. Without the outgoing interface, the router cannot determine the correct path. The other options are incorrect: Link-local next-hops are valid but require the interface. IPv6 uses Neighbor Discovery Protocol (NDP) for address resolution, not ARP, but NDP still needs to know which interface to use to find the neighbor. While NDP resolves link-local addresses, it doesn't negate the need for the outgoing interface in the static route definition.
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