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Difficulty: EasyIPv6 Static Routing

A network technician is configuring an IPv6 static route on a router to reach network 2001:DB8:5000:10::/642001:\text{DB8}:\text{5000}:10::/64. The technician intends to use the neighbor's link-local address FE80::2\text{FE80}::2 as the next hop. Which Cisco IOS command correctly configures this route using local interface GigabitEthernet0/1?

  1. ipv6 route 2001:DB8:5000:10::/64 GigabitEthernet0/1 FE80::2Answer
  2. B
    ipv6 route 2001:DB8:5000:10::/64 FE80::2
  3. C
    ip route 2001:DB8:5000:10::/64 GigabitEthernet0/1 FE80::2
  4. D
    ipv6 route FE80::2 2001:DB8:5000:10::/64 GigabitEthernet0/1

Answer

The command 'ipv6 route 2001:DB8:5000:10::/64 GigabitEthernet0/1 FE80::2' correctly configures the static route.
In Cisco IOS, a fully specified static route using a link-local next-hop address MUST explicitly specify the local exit interface (e.g., GigabitEthernet0/1) prior to the link-local address. This resolves ambiguity because link-local addresses exist on every IPv6-enabled interface.

Step-by-Step Solution

1
Identify the proper command syntax for IPv6 static routing
Begin with 'ipv6 route' followed by the target destination prefix and length.
Cisco IOS requires 'ipv6 route' for configuring static IPv6 prefixes.
2
Determine interface and next-hop parameter rules for link-local addresses
Include the local exit interface GigabitEthernet0/1 before the next-hop link-local address FE80::2\text{FE80}::2.
Because link-local addresses belong to the FE80::/10\text{FE80}::/10 block and are non-routable outside their local segment, the router must know which exit interface to use to reach the next hop.

Key Concept

IPv6 Static Route Link-Local Next-Hop Syntax
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Topics

IPv6 Static Routing

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