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Difficulty: EasyIPv6 Static Routing

A network engineer is configuring static routes on a Cisco IOS router to establish reachability to remote networks. Which TWO commands represent syntactically valid IPv6 static route configurations?

  1. ipv6 route 2001:db8:acad:2::/64 gigabitethernet 0/0/0 fe80::1Answer
  2. ipv6 route 2001:db8:acad:3::/64 2001:db8:acad:1::2 130Answer
  3. C
    ipv6 route 2001:db8:acad:4::/64 fe80::1
  4. D
    ipv6 route 2001:db8:acad:5::/64 2001:db8:acad:1::fffe:2/64

Answer

The syntactically valid IPv6 static route configurations are the fully specified route specifying both GigabitEthernet 0/0/0 and next-hop link-local address fe80::1, and the floating static route specifying the global unicast next-hop 2001:db8:acad:1::2 with an administrative distance of 130.
The command specifying both the exit interface GigabitEthernet 0/0/0 and the link-local next-hop address fe80::1 is valid because link-local addresses require an exit interface to define the link scope. The command specifying destination network 2001:db8:acad:3::/64 with global unicast next-hop 2001:db8:acad:1::2 and administrative distance 130 is also valid for configuring a floating static route.

Step-by-Step Solution

1
Evaluate the link-local next-hop static route syntax requirements.
Link-local addresses (fe80::/10) require an exit interface to be specified because link-local addresses are only unique to a given link.
Cisco IOS cannot resolve an egress interface solely from a link-local next-hop address.
2
Evaluate global unicast static route syntax and administrative distance positioning.
Global unicast next-hop static routes can be configured with an optional administrative distance parameter at the end of the command.
Setting an administrative distance higher than dynamic routing protocols creates a backup or floating static route.

Key Concept

IPv6 Static Route Syntax Rules for Link-Local and Global Unicast Next Hops
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Topics

IPv6 Static Routing

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