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Difficulty: MediumIPv6 Static Routing

A network engineer is configuring a static route on router R1 to reach remote network 2001:db8:c0ff:20::/642001:\text{db8}:\text{c0ff}:20::/64. The engineer intends to forward traffic to the neighboring router using its link-local address fe80::215:c5ff:feab:3102\text{fe80}::215:c5ff:\text{feab}:3102 through R1's local interface GigabitEthernet0/0/1. Which Cisco IOS command successfully accomplishes this configuration?

  1. ipv6 route 2001:db8:c0ff:20::/64 GigabitEthernet0/0/1 fe80::215:c5ff:feab:3102Answer
  2. B
    ipv6 route 2001:db8:c0ff:20::/64 fe80::215:c5ff:feab:3102
  3. C
    ipv6 route fe80::215:c5ff:feab:3102 GigabitEthernet0/0/1 2001:db8:c0ff:20::/64
  4. D
    ip route 2001:db8:c0ff:20::/64 GigabitEthernet0/0/1 fe80::215:c5ff:feab:3102

Answer

The command specifying 'ipv6 route 2001:db8:c0ff:20::/64 GigabitEthernet0/0/1 fe80::215:c5ff:feab:3102' is the correct configuration.
The correct command follows exact Cisco IOS syntax for a fully specified static route: 'ipv6 route <prefix/mask> <exit-interface> <link-local-address>'. Because link-local IPv6 addresses are only significant on the local link, Cisco IOS requires the exit interface to be explicitly named.

Step-by-Step Solution

1
Identify the global configuration command syntax for IPv6 static routing.
The correct base command is 'ipv6 route <destination-prefix/prefix-length>'.
IPv6 routing commands use the 'ipv6' prefix rather than 'ip'.
2
Determine the mandatory parameters for link-local next-hop addresses.
A local exit interface must be included alongside the link-local address (fully specified static route).
Link-local addresses (fe80::/10) are link-scoped; without an exit interface, the router cannot determine which link to send packets out on.
3
Assemble the complete Cisco IOS command.
'ipv6 route 2001:db8:c0ff:20::/64 GigabitEthernet0/0/1 fe80::215:c5ff:feab:3102'
This places the destination network, local exit interface, and link-local next-hop in exact positional order.

Key Concept

Fully specified IPv6 static route requiring local exit interface when using link-local next-hop
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Topics

IPv6 Static Routing

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