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Example: Configuring OSPFv3 for IPv6

 
Figure 1: OSPFv3 for IPv6 Topology Diagram
OSPFv3 for IPv6 Topology Diagram

Figure 1 shows an OSPFv3 topology. Routers 0, 1, 2, and 3 are connected to the OSPFv3 backbone Area 0; Routers 2, 3, and 4 connect to each other across Area 1; and Area 2 is located between Router  4 and Router 5. Because Router 5 does not have a direct adjacency to Area 0, a virtual link is required across Area 1 between Router 3 and Router 4. Similarly, because Routers 0 and 1 have two separate Area 0 backbone sections, you need to configure a second virtual link across Area 1 between Routers 2 and 3.

On Router 0, add the so-0/3/2 interface into Area 0 of the OSPFv3 process.

Router 0

On Router 1, add the at-2/0/0 interface into Area 0 of the OSPFv3 process:

Router 1

On Router 2, add the interfaces connected to Routers 1, 3, and 4 into the OSPFv3 process. You must also complete the virtual link to Router 3 through Area 1 so that Router 1 can access the discontiguous portion of the OSPF backbone found on Router 0.

Router 2

For the OSPFv3 process on Router 3, configure the interfaces connected to Router 2 and Router 4 into Area 1 and the interface connected to Router 0 into Area 0. You must also configure two virtual links through Area 1—one connecting to Router 2 and the second connecting to Router 4. The virtual links allow Router  5 to access the OSPF backbone, and connect the discontiguous sections of Area 0 located at Router 0 and Router 1.

Router 3

On Router 4, add the connected interfaces into the OSPFv3 process. You must also complete the virtual link to Router 3 through Area 1 so that Router 5 can access the OSPF backbone.

Router 4

On Router 5, add the fe-0/0/0 interface into the OSPFv3 process to complete this example:

Router 5

Verifying Your Work

To verify proper operation of OSPFv3 for IPv6, use the following commands:

  • show ospf3 interface

  • show ospf3 neighbor

  • show ospf3 database

  • show ospf3 route

  • show interfaces terse (to see the IPv6 link local address assigned to the lo0 interface)

    Note

    To view prefix information, you must use the extensive option with the show ospf3 database command.

The following sections show the output of these commands used with the configuration example.

Note

In the below sample output, the stars indicate the “best” routes. These routes are the routes that are installed in the routing table.

Router 0 Status

user@router0> show ospf3 database

To provide a comparison between OSPFv3 show commands and legacy OSPFv2 show commands, the following is some sample output of the OSPFv2 connection between Routers 0 and 3:

user@router0> show ospf interface

Router 1 Status

user@router1> show ospf3 interface

Router 2 Status

user@router2> show ospf3 interface

Router 3 Status

user@router3> show ospf3 interface

To provide a comparison between OSPFv3 show commands and legacy OSPFv2 show commands, the following is some sample output of the OSPFv2 connection between Routers 0 and 3:

user@router3> show ospf interface

Router 4 Status

user@router4> show ospf3 interface

Router 5 Status

user@router5> show ospf3 interface