Configuring IPv4 Routing for OSPFv3

Two Essential Steps for IPv4 Routing Configuration

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Which two steps must you perform on each device that is configured for IPv4 routing before you implement OSPFv3? (Choose two)



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A. B. C. D. E.


Before implementing OSPFv3 on devices configured for IPv4 routing, there are two important steps you must perform:

  1. Configure an Autonomous System Number (ASN)
  2. Configure a Router ID


  1. Configure an Autonomous System Number (ASN):

An autonomous system (AS) is a collection of networks and routers that operate under a single administrative domain. To enable OSPFv3, you must configure an autonomous system number (ASN) on each router in the network. OSPFv3 uses this number to distinguish one AS from another. The ASN must be the same on all routers in the same OSPFv3 domain. You can configure an ASN using the following command:

router ospfv3 [ASN]

The ASN can be any number between 1 and 4,294,967,295, but it is recommended to use a number between 1 and 65,535.

  1. Configure a Router ID:

A router ID (RID) is a unique identifier that OSPFv3 uses to identify each router in the network. OSPFv3 uses the RID to determine the shortest path to each destination network. The RID can be manually configured or automatically assigned by the router. To configure a router ID manually, use the following command:

router-id [IP address]

The IP address used for the RID must be a valid IP address on the router. If you do not manually configure the RID, OSPFv3 will automatically assign one based on the highest IP address on a loopback interface or physical interface that is in an "up/up" state.

Therefore, the correct answers are A and C: configure an autonomous system number and configure a router ID.

The other options, B, D, and E, are not necessary for OSPFv3 configuration. However, it is important to note that OSPFv3 is an IPv6 routing protocol, so it requires IPv6 to be enabled on the router. Enabling IPv6 unicast routing is also necessary for OSPFv3 to function properly.