Cisco Certified Network Associate (CCNA) Practice Exam

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What command is used to set the router ID in OSPFv3?

  1. router-id 1.1.1.1

  2. set router-id 1.1.1.1

  3. ospf router-id 1.1.1.1

  4. ipv6 ospf router-id 1.1.1.1

The correct answer is: router-id 1.1.1.1

To set the router ID in OSPFv3, the correct command is "ipv6 ospf router-id 1.1.1.1." In OSPFv3, which is designed for IPv6 networks, a specific command structure is necessary. Unlike OSPF for IPv4, where the command is simply "router-id," OSPFv3 requires you to specify "ipv6 ospf" followed by the router ID in the appropriate format. The configuration for OSPFv3 takes into account the differences in addressing between IPv4 and IPv6, hence the inclusion of "ipv6" in the command. This command helps the router identify itself within the OSPF domain, which is crucial for proper routing decisions and forming adjacencies with other OSPF routers. Understanding this subtlety is important for effective implementation and troubleshooting of OSPFv3 in a network environment.

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