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Zorluk: ZorIPv6 Static Routing

A network administrator is configuring static routing on router HQ to forward traffic bound for remote subnet 2001:db8:feed:10::/642001:\text{db8}:\text{feed}:10::/64. The outbound connection uses a point-to-point serial-like Ethernet link where the remote router interface uses the link-local address fe80::21a:2bff:fe3c:4d5e\text{fe80}::21a:2bff:\text{fe3c}:4d5e on interface GigabitEthernet0/0/1. The primary path must use an administrative distance of 11, but if configured using a link-local next-hop address without an outbound interface specified, Cisco IOS will reject the command. Which command correctly establishes a fully-specified IPv6 static route for this destination using the link-local next hop?

  1. ipv6 route 2001:db8:feed:10::/64 GigabitEthernet0/0/1 fe80::21a:2bff:fe3c:4d5eCevap
  2. B
    ipv6 route 2001:db8:feed:10::/64 fe80::21a:2bff:fe3c:4d5e
  3. C
    ipv6 route 2001:db8:feed:10::/64 GigabitEthernet0/0/1 fe80::21a:2bFF:FE3c:4d5e 120
  4. D
    ip route 2001:db8:feed:10::/64 GigabitEthernet0/0/1 fe80::21a:2bff:fe3c:4d5e

Cevap

The correct command is 'ipv6 route 2001:db8:feed:10::/64 GigabitEthernet0/0/1 fe80::21a:2bff:fe3c:4d5e', which specifies both the exit interface and the link-local address for a fully-specified IPv6 static route.
When configuring an IPv6 static route with a link-local address as the next hop, Cisco IOS requires a fully-specified static route syntax: 'ipv6 route <destination-prefix/prefix-length> <exit-interface> <link-local-next-hop>'. Since link-local addresses (FE80::/10) are only unique on the local link, specifying GigabitEthernet0/0/1 clarifies which link to transmit packets across.

Adım Adım Çözüm

1
Identify the destination prefix and prefix length.
The target prefix is 2001:db8:feed:10::/642001:\text{db8}:\text{feed}:10::/64.
The prefix must be explicitly identified at the start of the Cisco IOS IPv6 static route command syntax.
2
Determine the next-hop mechanism requirements for link-local addresses.
When a link-local address (fe80::…\text{fe80}::\dots) is used as a next hop, Cisco IOS requires specifying the local exit interface alongside the link-local address.
Link-local addresses are scope-limited to a single link, so the router needs the exit interface identifier to know which link to send the packet on.
3
Construct the exact syntax for a fully-specified route.
The syntax is 'ipv6 route <prefix/length> <exit-interface> <link-local-address>'.
This syntax creates a valid fully-specified IPv6 static route with the default administrative distance of 1.

Anahtar Kavram

IPv6 Fully-Specified Static Routing with Link-Local Next-Hop
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Konular

IPv6 Static Routing

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