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Difficulty: MediumIPv6 Static Routing

A network administrator needs to create a static route on router R1 to reach remote subnet 2001:db8:100:50::/642001:\text{db8}:100:50::/64. The administrator decides to specify the next-hop router R2 using R2's link-local address fe80::20c:29ff:fe01:a1b2fe80::20c:29ff:fe01:a1b2 across R1's outbound GigabitEthernet 0/0/1 interface. Which Cisco IOS command correctly configures this IPv6 static route?

  1. ipv6 route 2001:db8:100:50::/64 GigabitEthernet0/0/1 fe80::20c:29ff:fe01:a1b2Answer
  2. B
    ipv6 route 2001:db8:100:50::/64 fe80::20c:29ff:fe01:a1b2
  3. C
    ipv6 route 2001:db8:100:50::/64 GigabitEthernet0/0/1 fe80::20c:29ff:ffff:a1b2
  4. D
    ip route 2001:db8:100:50::/64 GigabitEthernet0/0/1 fe80::20c:29ff:fe01:a1b2

Answer

The command 'ipv6 route 2001:db8:100:50::/64 GigabitEthernet0/0/1 fe80::20c:29ff:fe01:a1b2' correctly configures the fully specified IPv6 static route.
The correct command uses the 'ipv6 route' keyword followed by the target destination network prefix (2001:db8:100:50::/642001:\text{db8}:100:50::/64), the local egress interface (GigabitEthernet0/0/1), and the link-local address of the adjacent router (fe80::20c:29ff:fe01:a1b2fe80::20c:29ff:fe01:a1b2). Because link-local addresses are valid only on their local segment, including the local exit interface is mandatory.

Step-by-Step Solution

1
Identify the proper command prefix for IPv6 static routing.
The command must begin with 'ipv6 route'.
Cisco IOS separates IPv4 ('ip route') and IPv6 ('ipv6 route') static configuration commands.
2
Evaluate next-hop requirements when using link-local addresses.
Both the exit interface and the link-local next-hop IPv6 address must be specified.
Link-local addresses (fe80::/10) are local to a specific link. Without specifying the exit interface, the router cannot determine which physical segment the link-local address belongs to.
3
Verify command syntax order.
Syntax: 'ipv6 route <destination-prefix/prefix-length> <exit-interface> <link-local-address>'.
This fully specified static route syntax satisfies all Cisco IOS requirements for link-local next-hops.

Key Concept

IPv6 Fully Specified Static Routing with Link-Local Next-Hop
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Topics

IPv6 Static Routing

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