Open Shortest Path First Version 3 (OSPFv3)

This chapter covers the following subjects:

• OSPFv3 Fundamentals: This section provides an overview of the OSPFv3 routing protocol and the similarities to OSPFv2.

• OSPFv3 Configuration: This section demonstrates the configuration and verification of an OSPFv3 environment.

• IPv4 Support in OSPFv3: This section explains and demonstrates how OSPFv3 can be used for exchanging IPv4 routes.

OSPF Version 3 (OSPFv3), which is the latest version of the OSPF protocol, includes support for both the IPv4 and IPv6 address families. The OSPFv3 protocol is not backward compatible with OSPFv2, but the protocol mechanisms described in Chapters 8, “OSPF,” and 9, “Advanced OSPF,” are essentially the same for OSPFv3. This chapter expands on Chapter 9 and discusses OSPFv3 and its support of IPv6.

“Do I Know This Already?” Quiz

The “Do I Know This Already?” quiz enables you to assess whether you should read the entire chapter. If you miss no more than one of these self-assessment questions, you might want to move ahead to the “Exam Preparation Tasks” section. Table 10-1 lists the major headings in this chapter and the “Do I Know This Already?” quiz questions covering the material in those headings so you can assess your knowledge of these specific areas. The answers to the “Do I Know This Already?” quiz appear in Appendix A, “Answers to the ‘Do I Know This Already?’ Questions.”

Table 10-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping

1. OSPFv3 uses ___________ packet types for inter-router communication.

   1. three

   2. four

   3. five

   4. six

   5. seven

2. The OSPFv3 hello packet uses the ___________ for the destination address.

   1. MAC address 00:C1:00:5C:00:FF

   2. MAC address E0:00:00:06:00:AA

   3. IP address 224.0.0.8

   4. IP address 224.0.0.10

   5. IPv6 address FF02::A

   6. IPv6 address FF02::5

3. How do you enable OSPFv3 on an interface?

   1. Use the command network prefix/prefix-length under the OSPF process.

   2. Use the command network interface-id under the OSPF process.

   3. Use the command ospfv3 process-id ipv6 area area-id under the interface.

   4. Nothing. OSPFv3 is enabled on all IPv6 interfaces upon initialization of the OSPF process.

4. True or false: On a brand-new router installation, OSPFv3 requires only that an IPv6 link-local address be configured and that OSPFv3 be enabled on that interface to form an OSPFv3 neighborship with another router.

   1. True

   2. False

5. True or false: OSPFv3 support for IPv4 networks only requires that an IPv4 address be assigned to the interface and that the OSPFv3 process be initialized for IPv4.

   1. True

   2. False