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Difficulty: MediumIPv6 Static Routing

A network administrator needs to configure a static route on router R1 to reach the destination subnet 2001:db8:fed:10::/642001:\text{db8}:\text{fed}:10::/64. The next-hop router's interface uses the link-local IPv6 address fe80::2\text{fe80}::2 across the local GigabitEthernet0/0/1 point-to-point link. Which command must be entered on R1 to properly establish this route?

  1. ipv6 route 2001:db8:fed:10::/64 GigabitEthernet0/0/1 fe80::2Answer
  2. B
    ipv6 route 2001:db8:fed:10::/64 fe80::2
  3. C
    ipv6 route 2001:db8:fed:10::/64 fe80::2 GigabitEthernet0/0/1
  4. D
    ipv6 route 2001:db8:fed:10::/64 GigabitEthernet0/0/1

Answer

The command 'ipv6 route 2001:db8:fed:10::/64 GigabitEthernet0/0/1 fe80::2' is the correct configuration.
When configuring an IPv6 static route using a link-local address as the next hop, Cisco IOS requires a fully specified route syntax containing both the local exit interface and the link-local address in the format: 'ipv6 route <prefix/mask> <exit-interface> <link-local-address>'. The option specifying 'GigabitEthernet0/0/1' followed by 'fe80::2' accurately matches this syntax requirement.

Step-by-Step Solution

1
Identify the target destination prefix and prefix length
Destination prefix is 2001:db8:fed:10::/642001:\text{db8}:\text{fed}:10::/64.
Static routing commands start with the target network prefix and mask length.
2
Evaluate the next-hop address type
The next-hop address fe80::2\text{fe80}::2 is a link-local IPv6 address (FE80::/10 range).
Link-local addresses are non-routable and scoped strictly to a single link segment.
3
Apply Cisco IOS fully specified IPv6 static route syntax rules
The required command format is 'ipv6 route <prefix/mask> <exit-interface> <link-local-next-hop>'.
Specifying the exit interface GigabitEthernet0/0/1 before the link-local address fe80::2\text{fe80}::2 resolves interface ambiguity.

Key Concept

Fully specified IPv6 static routes with link-local next-hop addresses
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Topics

IPv6 Static Routing

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