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Difficulty: MediumIPv6 Static Routing

An engineer needs to configure a static route on a Cisco router to forward traffic destined for 2001:db8:a:10::/642001:\text{db8}:\text{a}:10::/64. The route must use the next-hop router's link-local address fe80::211:25ff:feab:1234\text{fe80}::211:25\text{ff}:\text{feab}:1234 via the local interface GigabitEthernet0/1. Which command correctly configures this IPv6 static route?

  1. ipv6 route 2001:db8:a:10::/64 GigabitEthernet0/1 fe80::211:25ff:feab:1234Answer
  2. B
    ipv6 route 2001:db8:a:10::/64 fe80::211:25ff:feab:1234
  3. C
    ipv6 route 2001:db8:a:10::/64 GigabitEthernet0/1 fe80::211:25ff:fffe:1234
  4. D
    ip route 2001:db8:a:10::/64 GigabitEthernet0/1 fe80::211:25ff:feab:1234

Answer

ipv6 route 2001:db8:a:10::/64 GigabitEthernet0/1 fe80::211:25ff:feab:1234
The command 'ipv6 route 2001:db8:a:10::/64 GigabitEthernet0/1 fe80::211:25ff:feab:1234' is correct because configuring an IPv6 static route with a link-local next-hop address requires a fully specified route configuration that explicitly specifies the local exit interface prior to the link-local next-hop address.

Step-by-Step Solution

1
Identify the proper command syntax for IPv6 static routing.
The configuration must use the global configuration command starting with 'ipv6 route' followed by the target destination prefix and prefix length (2001:db8:a:10::/64).
Cisco IOS differentiates IPv4 and IPv6 static routes by requiring the 'ipv6 route' keyword for IPv6.
2
Determine the required parameters for a link-local next-hop address.
Because the next-hop is a link-local address (fe80::/10), the command must explicitly include both the exit interface (GigabitEthernet0/1) and the link-local address (fe80::211:25ff:feab:1234).
Link-local addresses are only valid on a specific physical link. Without the local exit interface context, the router cannot determine which outgoing interface to use to reach the next-hop.

Key Concept

Fully Specified IPv6 Static Route
Estimated Time:1m 0s
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Topics

IPv6 Static Routing

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