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Difficulty: MediumIPv6 Static Routing

A network engineer is configuring IPv6 static routes on a Cisco router to forward traffic to the destination network 2001:db8:acad:10::/642001:\text{db8}:\text{acad}:10::/64. The primary path must use the neighbor's link-local address fe80::2\text{fe80}::2 via the local exit interface GigabitEthernet0/0/1. A secondary floating static route must use the global unicast next-hop address 2001:db8:acad:3::22001:\text{db8}:\text{acad}:3::2 with an administrative distance of 130. Which two commands must be configured on the router?

  1. ipv6 route 2001:db8:acad:10::/64 gigabitethernet0/0/1 fe80::2Answer
  2. ipv6 route 2001:db8:acad:10::/64 2001:db8:acad:3::2 130Answer
  3. C
    ipv6 route 2001:db8:acad:10::/64 fe80::2
  4. D
    ipv6 route 2001:db8:acad:10::/64 2001:db8:acad:3::2 1

Answer

The two correct commands are the fully specified static route using interface GigabitEthernet0/0/1 with link-local next-hop fe80::2, and the static route specifying next-hop 2001:db8:acad:3::2 with administrative distance 130.
The command specifying GigabitEthernet0/0/1 alongside fe80::2 correctly formats a fully specified IPv6 static route using a link-local next-hop address. The command specifying 2001:db8:acad:3::2 followed by 130 correctly configures a floating static route with an administrative distance of 130.

Step-by-Step Solution

1
Identify the mandatory syntax requirement for IPv6 static routes using link-local next-hop addresses.
Link-local addresses (fe80::/10) are non-routable and ambiguous without a specific local interface identifier. Therefore, the command must include the local exit interface alongside the link-local next-hop address.
Cisco IOS requires a fully specified route format whenever a link-local address serves as the next hop.
2
Evaluate the administrative distance configuration for the backup floating static route.
The backup route uses global unicast next-hop 2001:db8:acad:3::2 and requires an administrative distance higher than the primary route (default AD = 1), so 130 must be appended to the command.
Floating static routes remain inactive in the routing table until the primary route fails, which occurs only if their administrative distance is higher than the primary route's AD.

Key Concept

IPv6 Static Route Command Syntax and Floating Static Route AD Configuration
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Topics

IPv6 Static Routing

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