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Difficulty: MediumIPv6 Static Routing

A network administrator needs to configure a fully specified IPv6 static route on a Cisco router to reach the remote network 2001:DB8:ACAD:1::/642001:\text{DB8}:\text{ACAD}:1::/64 using the neighbor router's link-local address FE80::2\text{FE80}::2 reachable via the local GigabitEthernet0/1\text{GigabitEthernet0/1} interface. Which command correctly configures this route?

  1. ipv6 route 2001:DB8:ACAD:1::/64 GigabitEthernet0/1 FE80::2Answer
  2. B
    ipv6 route 2001:DB8:ACAD:1::/64 FE80::2
  3. C
    ipv6 route 2001:DB8:ACAD:1::/64 GigabitEthernet0/1 FE80::2 110
  4. D
    ipv6 route 2001:DB8:ACAD:1::/64 GigabitEthernet0/1 FE80::FFFE:2

Answer

The command 'ipv6 route 2001:DB8:ACAD:1::/64 GigabitEthernet0/1 FE80::2' correctly configures the fully specified IPv6 static route.
When configuring an IPv6 static route using a link-local address as the next-hop, Cisco IOS mandates a fully specified route that includes both the local exit interface and the link-local address of the adjacent router.

Step-by-Step Solution

1
Identify the mandatory components of an IPv6 static route command with a link-local next hop.
The general syntax requires specifying both the local exit interface and the link-local next-hop address: 'ipv6 route <prefix/mask> <exit-interface> <link-local-address>'.
Because IPv6 link-local addresses (FE80::/10) are only unique on a single local link, Cisco IOS cannot determine which outbound interface to use unless the interface is explicitly defined.
2
Evaluate the specified parameters.
Destination prefix = 2001:DB8:ACAD:1::/64, Exit interface = GigabitEthernet0/1, Next-hop = FE80::2.
Combining these exact parameters in order produces a valid fully specified static route configuration.

Key Concept

Fully specified IPv6 static routes requiring both an exit interface and link-local next-hop address.
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Topics

IPv6 Static Routing

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