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Difficulty: Very hardIPv6 Static Routing

A network administrator needs to configure a backup floating static default route on router Edge-R1 to reach an upstream provider. The primary default route is currently learned via OSPFv3 with an administrative distance of 110110. The next-hop provider router interface has a global unicast address of 2001:db8:200:1::1/642001:\text{db8}:200:1::1/64 and a link-local address of fe80::250:56ff:fe9a:1234\text{fe80}::250:56\text{ff}:\text{fe9a}:1234 connected directly to interface GigabitEthernet0/0/0 on Edge-R1. Which command correctly configures the floating static default route using the provider's link-local address with an administrative distance of 130130?

  1. ipv6 route ::/0 GigabitEthernet0/0/0 fe80::250:56ff:fe9a:1234 130Answer
  2. B
    ipv6 route ::/0 fe80::250:56ff:fe9a:1234 130
  3. C
    ipv6 route ::/0 2001:db8:200:1::1 110
  4. D
    ipv6 route ::/0 GigabitEthernet0/0/0 fe80::250:56ff:ffff:1234 130

Answer

The correct command is 'ipv6 route ::/0 GigabitEthernet0/0/0 fe80::250:56ff:fe9a:1234 130'.
The option specifying 'ipv6 route ::/0 GigabitEthernet0/0/0 fe80::250:56ff:fe9a:1234 130' is correct because '::/0' represents the default route, the exit interface GigabitEthernet0/0/0 is explicitly declared alongside the link-local next hop, and the administrative distance of 130 makes it a floating static backup route relative to OSPFv3 (110).

Step-by-Step Solution

1
Identify the IPv6 network prefix representation for a default route.
The default route in IPv6 is represented by the prefix '::/0'.
Default routes match all destination IPv6 addresses not specifically listed in the routing table.
2
Determine the syntax requirements for specifying a link-local address as a next-hop.
When a link-local address (fe80::/10) is specified as the next hop, the local exit interface (GigabitEthernet0/0/0) must precede the next-hop address.
Link-local addresses are only unique on the local link, requiring explicit egress interface designation.
3
Set the administrative distance for floating static route functionality.
Set the administrative distance to 130, which is higher than OSPFv3's administrative distance of 110.
A floating static route remains inactive in the routing table until the primary dynamic routing path fails.

Key Concept

IPv6 Static Route Syntax with Link-Local Next-Hop and Floating Administrative Distance
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Topics

IPv6 Static Routing

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