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Forum Replies

  1. Hi Rene,
    Do areas work the same way ON IPV6 as on OSPF v2?

  2. HI
    How to config with many area .could you pls exam. thanks a lots

  3. Hello Sanjiv.

    In order to clarify why you’re getting the error, first let’s look back on how a router chooses its router ID. A router ID is always in the format of an IPv4 address. The router ID is chosen in the following order:

    1. If a router ID is configured in the ospf configuration, this is used as the router ID.
    2. If no router ID is configured, then it uses the highest IP address of a loopback interface
    3. If no loopback interface exists, it will use the highest IP address of any physical interface in the “up” state.

    Now if you’re using IPv4, then one of the a

    ... Continue reading in our forum

  4. 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

  5. Hello Chris,

    Good question, this can be confusing. Originally, OSPFv3 was created only for IPv6:


    Later, OSPFv3 was updated to support address-families:


    This means you can run it for IPv6 and IPv4 (and some other address families like multicast).

    The “ipv6 ospf” commands are the “old” commands and the “ospfv3” commands are the newer commands.

    If you use “ipv6 ospf” on an interface and later use “ospfv3” then you’ll see that the “ipv6 ospf” command will disappear.

    “ipv6 router ospf” is t

    ... Continue reading in our forum

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