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Configuring Stub and Not-So-Stubby Areas (Optional)

To control the advertisement of external routes into an area, you can create stub areas and not-so-stubby areas (NSSAs) in an OSPF network. In the network shown in Figure 75, area 0.0.0.7 has no external connections and can be configured as a stub area. Area 0.0.0.9 only has external connections to static routes and can be configured as an NSSA.

Figure 75: OSPF Network Topology with Stub Areas and NSSAs

Image g015030.gif

To configure stub areas and NSSAs in an OSPF network like the one shown in Figure 75:

  1. Create the area and enable OSPF on the interfaces within that area.

    For instructions, see Creating Additional OSPF Areas.

  2. Configure an area border router to bridge the areas.

    For instructions, see Configuring Area Border Routers.

  3. Navigate to the top of the configuration hierarchy in either the J-Web or the CLI configuration editor.
  4. To configure each Services Router in area 0.0.0.7 as a stub area router, perform the configuration tasks described in Table 130.
  5. If you are finished configuring the router, commit the configuration.
  6. Go on to one of the following procedures:

Table 130: Configuring Stub Area and Not-So-Stubby Area Routers

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the 0.0.0.7 level in the configuration hierarchy.
  1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
  2. Next to Protocols, click Edit.
  3. Next to Ospf, click Edit.
  4. Under Area id, click 0.0.0.7.

From the [edit] hierarchy level, enter

edit protocols ospf area 0.0.0.7

Configure each Services Router in area 0.0.0.7 as a stub router.

  1. In the Stub option list, select Stub and click OK.
  2. Repeat Step 1 for every Services Router in the stub area to configure them with the stub parameter for the area.
  1. Set the stub attribute:

    set stub

  2. Repeat Step 1 for every Services Router in the stub area to configure them with the stub parameter for the area.

Navigate to the 0.0.0.9 level in the configuration hierarchy.
  1. On the main Configuration page next to Protocols, click Edit.
  2. Next to Ospf, click Edit.
  3. Under Area id, click 0.0.0.9.

From the [edit] hierarchy level, enter

edit protocols ospf area 0.0.0.9

Configure each Services Router in area 0.0.0.9 as an NSSA router.

  1. In the Stub option list, select Nssa and click OK.
  2. Repeat Step 1 for every Services Router in the NSSA to configure them with the nssa parameter for the area.
  1. Set the nssa attribute:

    set nssa

  2. Repeat Step 1 for every Services Router in the NSSA to configure them with the nssa parameter for the area.
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