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Zorluk: ZorIPv6 Static Routing

A network administrator is configuring a backup route on a Cisco IOS router to reach a remote branch office network with the prefix 2001:db8:fedc:9900::/562001:\text{db8}:\text{fedc}:9900::/56. The primary path is currently provided by OSPFv3 with an administrative distance of 110110. The administrator must configure a floating static route using the next-hop router's link-local address fe80::cafe:1fe80::cafe:1 over the local exit interface GigabitEthernet0/0/1GigabitEthernet0/0/1. Which command correctly configures this backup floating static route on the router?

  1. ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::cafe:1 120Cevap
  2. B
    ipv6 route 2001:db8:fedc:9900::/56 fe80::cafe:1 120
  3. C
    ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::cafe:1 90
  4. D
    ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::fffe:cafe:1 120

Cevap

The command 'ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::cafe:1 120' correctly configures the backup floating static route.
The correct command syntax for an IPv6 static route using a link-local next-hop requires specifying both the local exit interface and the link-local address of the neighbor. Furthermore, setting the administrative distance to 120120 ensures it is higher than the primary OSPFv3 route's administrative distance of 110110, making it a true floating static route.

Adım Adım Çözüm

1
Determine the required administrative distance for the backup route.
Since OSPFv3 has an administrative distance of 110110, the backup route must have an administrative distance greater than 110110 (such as 120120) to remain floating (inactive until the primary route fails).
Floating static routes rely on a higher administrative distance than the primary routing protocol.
2
Identify the next-hop address requirements for IPv6 static routing.
When using a link-local IPv6 address (fe80::/10fe80::/10) as the next-hop, Cisco IOS mandates a fully specified static route that includes the local exit interface (GigabitEthernet0/0/1GigabitEthernet0/0/1).
Link-local addresses are non-routable and only unique to the specific local link/interface.
3
Construct the exact Cisco IOS syntax.
'ipv6 route 2001:db8:fedc:9900::/56 GigabitEthernet0/0/1 fe80::cafe:1 120'
Syntax follows 'ipv6 route <prefix/mask> <exit-interface> <next-hop-address> [administrative-distance]'.

Anahtar Kavram

Fully Specified IPv6 Floating Static Route Configuration
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Konular

IPv6 Static Routing

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