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Difficulty: HardIPv6 Static Routing

A network administrator needs to configure an IPv6 static route on router R1 to forward traffic to the remote network 2001:db8:10:20::/642001:\text{db8}:10:20::/64. The next-hop router's interface has a link-local address of fe80::212:79ff:fe34:5678\text{fe80}::212:79\text{ff}:\text{fe34}:5678 connected to R1's local interface GigabitEthernet0/0/1. Which Cisco IOS command correctly provisions this static route?

  1. ipv6 route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::212:79ff:fe34:5678Answer
  2. B
    ipv6 route 2001:db8:10:20::/64 fe80::212:79ff:fe34:5678
  3. C
    ipv6 route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::212:79ff:fffe:3456:7800
  4. D
    ipv6 route 2001:db8:10:20::/64 fe80::212:79ff:fe34:5678 GigabitEthernet0/0/1

Answer

The command 'ipv6 route 2001:db8:10:20::/64 GigabitEthernet0/0/1 fe80::212:79ff:fe34:5678' correctly configures the fully specified IPv6 static route.
The command correctly uses the Cisco IOS syntax for a static route pointing to a link-local address: 'ipv6 route <prefix/length> <exit-interface> <link-local-address>'. Because link-local IPv6 addresses (FE80::/10) are valid only on the local link, the local exit interface must be explicitly stated.

Step-by-Step Solution

1
Identify the target destination prefix and length.
Destination prefix is 2001:db8:10:20::/642001:\text{db8}:10:20::/64.
The prefix specifies the remote network to be added to the IPv6 routing table.
2
Evaluate the next-hop address type.
The next-hop address fe80::212:79ff:fe34:5678\text{fe80}::212:79\text{ff}:\text{fe34}:5678 is a link-local IPv6 address (starts with FE80::/10).
Link-local addresses require explicit egress interface identification because they are bound to a specific link.
3
Apply Cisco IOS IPv6 static route command syntax for link-local next hops.
Syntax must be: 'ipv6 route <prefix/length> <exit-interface> <link-local-next-hop>'.
Cisco IOS requires the local exit interface (GigabitEthernet0/0/1) immediately following the prefix and preceding the link-local address.

Key Concept

IPv6 Static Routing with Link-Local Next Hop
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Topics

IPv6 Static Routing

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