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Zorluk: Çok zorIPv6 Static Routing

A network administrator is configuring a backup floating static IPv6 route on router R1 to reach the remote prefix 2001:db8:acad:44::/642001:\text{db8}:\text{acad}:44::/64. The primary route to this subnet is learned via OSPFv3 with an administrative distance of 110. The administrator wants to route backup traffic through the link-local address fe80::211:23ff:fe45:6789fe80::211:23ff:fe45:6789 of the neighboring router connected to interface GigabitEthernet0/0/1GigabitEthernet0/0/1, assigning an administrative distance of 130. Which Cisco IOS command correctly configures this floating static route?

  1. ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:fe45:6789 130Cevap
  2. B
    ipv6 route 2001:db8:acad:44::/64 fe80::211:23ff:fe45:6789 130
  3. C
    ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:feff:6789 130
  4. D
    ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:fe45:6789 90

Cevap

The command 'ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:fe45:6789 130' correctly configures the fully specified floating static IPv6 route.
The correct command uses the syntax 'ipv6 route <prefix/mask> <exit-interface> <next-hop-address> [administrative-distance]'. When a link-local address is used as the next hop, the local exit interface is mandatory because link-local addresses are scoped to the local link. Specifying an administrative distance of 130 ensures the route functions as a floating static route, acting as a backup to the OSPFv3 route which has an administrative distance of 110.

Adım Adım Çözüm

1
Identify the requirements for using a link-local address as an IPv6 static route next hop.
Because IPv6 link-local addresses (FE80::/10) are non-routable and exist only on a single local link, Cisco IOS requires specifying the local exit interface alongside the link-local next-hop address (a fully specified static route).
Without the exit interface, the router cannot resolve which interface to forward packets out of toward the non-unique link-local address.
2
Determine the administrative distance required for a floating static backup route.
The primary route has an OSPFv3 administrative distance of 110. To create a backup route that remains dormant in the routing table until the primary route fails, the static route AD must be set higher than 110 (specifically 130 as requested).
Lower administrative distances are preferred by the Cisco IOS routing table logic.
3
Verify syntax and address accuracy.
The syntax 'ipv6 route <prefix/mask> <exit-interface> <link-local-next-hop> <administrative-distance>' yields 'ipv6 route 2001:db8:acad:44::/64 GigabitEthernet0/0/1 fe80::211:23ff:fe45:6789 130'.
This matches all parameters, including proper EUI-64 link-local address formatting and correct AD placement.

Anahtar Kavram

Fully specified IPv6 static routes using link-local next-hop addresses and floating static administrative distance configuration.
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Konular

IPv6 Static Routing

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