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Difficulty: EasyIPv6 Static Routing

A network administrator needs to configure a static IPv6 route on a Cisco router to reach the destination network 2001:db8:acad:1::/64 using the next-hop router's link-local address fe80::1 via local interface GigabitEthernet0/0/1. Which Cisco IOS command correctly accomplishes this configuration?

  1. ipv6 route 2001:db8:acad:1::/64 GigabitEthernet0/0/1 fe80::1Answer
  2. B
    ipv6 route 2001:db8:acad:1::/64 fe80::1
  3. C
    ip route 2001:db8:acad:1::/64 GigabitEthernet0/0/1 fe80::1
  4. D
    ipv6 route 2001:db8:acad:1:: 255.255.255.0 GigabitEthernet0/0/1 fe80::1

Answer

The command 'ipv6 route 2001:db8:acad:1::/64 GigabitEthernet0/0/1 fe80::1' correctly configures the IPv6 static route using a link-local address with the mandatory local exit interface.
The correct command specifies 'ipv6 route' followed by the target IPv6 network prefix/length (2001:db8:acad:1::/64), the local exit interface (GigabitEthernet0/0/1), and the next-hop link-local address (fe80::1). In Cisco IOS, link-local addresses cannot be used as static route next-hops without identifying the local exit interface.

Step-by-Step Solution

1
Identify the destination IPv6 prefix and length
Destination prefix is 2001:db8:acad:1::/64.
IPv6 static routes require CIDR prefix notation (/64).
2
Evaluate next-hop address requirements
The next-hop address fe80::1 is a link-local address.
Link-local addresses (fe80::/10 range) are non-global and exist on every interface, making them ambiguous to the routing table without an exit interface context.
3
Formulate the correct Cisco IOS IPv6 static route command syntax
Command format: ipv6 route <destination-prefix/mask> <exit-interface> <link-local-next-hop>
Cisco IOS requires both the local exit interface and the link-local next-hop address for fully specified static routes using link-local next-hops.

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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