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Difficulty: MediumIPv6 Static Routing

A network engineer is configuring static routes on a Cisco IOS router to forward traffic to remote IPv6 networks. Which TWO statements accurately describe the requirements and behavior of IPv6 static route configurations? (Select TWO.)

  1. When specifying an IPv6 link-local address as the next-hop address, the local exit interface MUST also be specified in the command.Answer
  2. To configure a floating static IPv6 backup route, the administrative distance value must be set higher than the administrative distance of the primary route.Answer
  3. C
    When using a global unicast address as the next hop, specifying the outbound exit interface is mandatory for the route to enter the IPv6 routing table.
  4. D
    A default IPv6 static route uses the prefix notation 0.0.0.0/0 followed by the next-hop IPv6 address.

Answer

The correct statements are: specifying the local exit interface is mandatory when using a link-local next-hop address, and configuring a floating static route requires an administrative distance higher than the primary route.
In Cisco IOS IPv6 static routing, link-local next-hop addresses require the specifying of the local exit interface because link-local addresses are ambient to the specific interface link. Furthermore, creating a backup (floating) static route requires setting an administrative distance value strictly higher than the primary route so it remains inactive until the primary path fails.

Step-by-Step Solution

1
Analyze link-local next-hop requirements
Link-local addresses are non-routable outside their local segment, making the exit interface mandatory for path identification.
Without specifying the exit interface, the router cannot determine which local link connects to the link-local neighbor.
2
Analyze floating static route administrative distance mechanics
Setting a higher administrative distance keeps the static route out of the routing table until the primary route drops.
Lower administrative distance routes are preferred by the Cisco IOS routing table logic.

Key Concept

IPv6 Static Route Next-Hop Types and Administrative Distance Configuration
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Topics

IPv6 Static Routing

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