A network engineer needs to configure an IPv6 static route on router R1 to forward traffic… — Cisco CCNA

A network engineer needs to configure an IPv6 static route on router R1 to forward traffic destined for remote subnet $2001:\text{db8}:\text{acad}:50::/64$ . The next-hop router's link-local address is $\text{fe80::fe54:99ff:fe12:34ab}$ via local interface GigabitEthernet0/0/2. Complete the Cisco IOS command below by filling in the exit interface and the next-hop address.

Answer:R1(config)# ipv6 route 2001:db8:acad:50::/64 【GigabitEthernet0/0/2】【fe80::fe54:99ff:fe12:34ab】

Answer

The missing command parameters are GigabitEthernet0/0/2 for the local exit interface (blank 1) and fe80::fe54:99ff:fe12:34ab for the link-local next-hop IPv6 address (blank 2).

When configuring an IPv6 static route using a link-local IPv6 address as the next hop, Cisco IOS requires a fully specified static route syntax where the local exit interface is specified first, followed by the link-local address. Therefore, the first blank requires the exit interface GigabitEthernet0/0/2 and the second blank requires the next-hop link-local address fe80::fe54:99ff:fe12:34ab.

Step-by-Step Solution

Identify the destination network prefix and prefix length.

The target network prefix is

2001:\text{db8}:\text{acad}:50::/64

This forms the first argument following the `ipv6 route` global configuration command keyword.

Determine the requirement for static routes configured with link-local next-hop addresses.

Because link-local addresses (

\text{fe80::/10}

) are only unique per link, Cisco IOS requires the local exit interface to be explicitly specified preceding the link-local address.

Without specifying the local exit interface, the router cannot determine which local interface to send packets out to reach the non-unique link-local address.

Assemble the complete IPv6 static route command string in Cisco IOS order.

`ipv6 route 2001:db8:acad:50::/64 GigabitEthernet0/0/2 fe80::fe54:99ff:fe12:34ab`

This populates GigabitEthernet0/0/2 as the first blank and fe80::fe54:99ff:fe12:34ab as the second blank.

Key Concept

Fully specified IPv6 static route syntax using a link-local next-hop address and local outbound interface.

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