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Difficulty: MediumIPv6 Static Routing

An administrator must create a static route on a Cisco router for destination prefix 2001:db8:fed::/642001:\text{db8}:\text{fed}::/64. The next-hop router's link-local address is fe80::2\text{fe80}::2, reached via local interface GigabitEthernet0/1, and the route must be configured with an administrative distance of 110. Which Cisco IOS command correctly completes this configuration?

  1. ipv6 route 2001:db8:fed::/64 GigabitEthernet0/1 fe80::2 110Answer
  2. B
    ipv6 route 2001:db8:fed::/64 fe80::2 110
  3. C
    ip route 2001:db8:fed::/64 GigabitEthernet0/1 fe80::2 110
  4. D
    ipv6 route 2001:db8:fed::/64 GigabitEthernet0/1 fe80::2

Answer

ipv6 route 2001:db8:fed::/64 GigabitEthernet0/1 fe80::2 110
The correct command follows the exact Cisco IOS syntax for a fully specified IPv6 static route: 'ipv6 route <destination-prefix/mask> <exit-interface> <next-hop-link-local-address> [administrative-distance]'.

Step-by-Step Solution

1
Identify the proper global configuration command prefix for IPv6 static routing.
Use 'ipv6 route' rather than IPv4's 'ip route'.
Cisco IOS separates IPv4 and IPv6 routing table management commands.
2
Evaluate link-local next-hop address rules in Cisco IOS IPv6 static routes.
When a link-local address (fe80::/10) is used as the next hop, the local exit interface (GigabitEthernet0/1) MUST also be specified (fully specified static route).
Link-local addresses are valid only on the local link and are shared across multiple interfaces, creating ambiguity if an exit interface is not designated.
3
Append the optional Administrative Distance (AD) value to the end of the command.
Place '110' at the end of the command string.
Setting an explicit AD overrides the default static route administrative distance of 1.

Key Concept

Fully specified IPv6 static route command syntax requiring an exit interface when using a link-local next-hop address.
Estimated Time:1m 15s
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Topics

IPv6 Static Routing

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