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Difficulty: MediumIPv6 Static Routing

A network administrator is configuring a static route on a Cisco router using a link-local address (fe80::2) as the next hop to reach the remote network 2001:db8:10:20::/64. The local egress interface is GigabitEthernet0/0/1. Which Cisco IOS command correctly configures this route?

  1. ipv6 route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::2Answer
  2. B
    ipv6 route 2001:db8:10:20::/64 fe80::2
  3. C
    ip route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::2
  4. D
    ipv6 route 2001:db8:10:20::/64 fe80::2 GigabitEthernet0/0/1

Answer

The correct command is 'ipv6 route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::2'.
When configuring an IPv6 static route using a link-local next-hop address, Cisco IOS requires a fully specified static route where the local exit interface (GigabitEthernet0/0/1) is provided prior to the next-hop IPv6 address (fe80::2).

Step-by-Step Solution

1
Identify the global configuration command syntax for IPv6 static routing.
The command structure must start with 'ipv6 route' followed by destination-prefix/prefix-length.
IPv6 static routes in Cisco IOS require the 'ipv6 route' keyword.
2
Determine the formatting requirements for link-local next-hop addresses.
Because link-local addresses (FE80::/10) are reused across multiple links, the router requires a fully specified route that includes the local exit interface before the link-local next-hop address.
Without specifying the exit interface, Cisco IOS rejects the link-local next hop as ambiguous.

Key Concept

Fully Specified IPv6 Static Routes using Link-Local Next-Hop Addresses
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Topics

IPv6 Static Routing

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