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Difficulty: MediumIPv6 Static Routing

A network administrator needs to manually configure an IPv6 static route on router R2 to forward traffic toward subnet 2001:db8:cafe:20::/642001:\text{db8}:cafe:20::/64. The next-hop router R1 uses a link-local IPv6 address of fe80::1\text{fe80}::1 on the shared point-to-point link attached to R2's local interface GigabitEthernet0/1. Which Cisco IOS command correctly configures this route?

  1. ipv6 route 2001:db8:cafe:20::/64 GigabitEthernet0/1 fe80::1Answer
  2. B
    ipv6 route 2001:db8:cafe:20::/64 fe80::1
  3. C
    ipv6 route 2001:db8:cafe:20::/64 fe80::1 GigabitEthernet0/1
  4. D
    ip route 2001:db8:cafe:20::/64 GigabitEthernet0/1 fe80::1

Answer

The command 'ipv6 route 2001:db8:cafe:20::/64 GigabitEthernet0/1 fe80::1' correctly configures the fully specified IPv6 static route.
In IPv6 static routing, when a link-local address (fe80::/10 range) is referenced as the next-hop address, the router requires a fully specified route. The syntax must explicitly state the local outbound interface followed by the link-local IPv6 address.

Step-by-Step Solution

1
Identify the target IPv6 prefix, exit interface, and next-hop address type.
Destination is 2001:db8:cafe:20::/642001:\text{db8}:cafe:20::/64, local exit interface is GigabitEthernet0/1, and next-hop is link-local address fe80::1\text{fe80}::1.
IPv6 link-local addresses are non-routable beyond the local link and can exist on multiple interface links on the same router.
2
Apply Cisco IOS IPv6 fully specified static route syntax rules.
The correct command format is 'ipv6 route <ipv6-prefix/prefix-length> <exit-interface> <link-local-next-hop>'.
Without the local exit interface parameter specified first, the router cannot resolve which link the link-local neighbor resides on.

Key Concept

IPv6 Fully Specified Static Routing with Link-Local Next-Hop
Estimated Time:1m 30s
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Topics

IPv6 Static Routing

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