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Forum Replies

  1. You can configure it like this:

    interface fa0/0
    ipv6 address FE80::1 link-local

    Just make sure it starts with FE80 and don’t forget “link-local” at the end.

  2. Hi AD,

    Link-local addresses are only used on the local link. These addresses are not routable and used only for things like neighbor discovery or to establish OSPF / EIGRP neighbor adjacencies and such.

    The idea behind IPv6 is that every device connected to the Internet should have a global unicast address. NAT/PAT for IPv4 were only “tricks” to get around the lack of available IPv4 addresses.

    On your own networks, you could use the unique local addresses in the fc00::/7 range. These are equal to IPv4 private range addresses.


  3. can you make a topic on how to read the opsv3 database? for example, in the following output:
    Net Link States (Area 0)

    ADV Router Age      Seq#                  Link ID    Rtr count             305      0x80000002   8                 2

    what is link id 8 referring to? is there a mapping to the link ip address?

  4. So we use an IPV4 Address for the Router-ID for IPV6 OSPF and EIGRP?
    Can you not use an IPV6 address for this?

  5. Can I ask what is the difference between the following 2 commands?

    “ospfv3 1 ipv6 area 0”
    “ipv6 ospf 1 area 0”

    I just tried this and it shows up differently under the running config:

    interface Ethernet0/0
    no ip address
    ipv6 enable
    ospfv3 1 ipv6 area 0
    interface Ethernet0/1
    no ip address
    ipv6 enable
    ipv6 ospf 1 area 0

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