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Configuring Area Border Routers

A Services Router operating as an area border router (ABR) has interfaces enabled for OSPF in the backbone area and in the area you are linking to the backbone. For example, Services Router B acts as the ABR in Figure 48 and has interfaces in both the backbone area and area 0.0.0.3.

  1. Navigate to the top of the configuration hierarchy in either the J-Web or the CLI configuration editor.
  2. Perform the configuration tasks described in Table 48.
  3. If you are finished configuring the network, commit the configuration.

    After you create the areas on the appropriate Services Routers and add and enable the appropriate interfaces to the areas, no additional configuration is required to enable OSPF traffic within or across the areas.

  4. Go on to one of the following procedures:

Table 48: Configuring Area Border Routers

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Ospf level in the configuration hierarchy.

In the configuration editor hierarchy, select Protocols>Ospf.

From the top of the configuration hierarchy, enter

edit protocols ospf

Verify that the backbone area has at least one interface enabled for OSPF.

Click 0.0.0.0 to display the Area ID 0.0.0.0 page, and verify that the backbone area has at least one interface enabled for OSPF.

For example, Services Router B in Figure 48 has the following interfaces enabled for OSPF in the backbone area:

  • Interface fe-0/0/0.0
  • Interface fe-0/0/1.0

To enable an interface on the backbone area, see Configuring a Single-Area OSPF Network (Required).

View the configuration using the show command:

show

For example, Services Router B in Figure 48 has the following interfaces enabled for OSPF in the backbone area:

area 0.0.0.0 { interface fe-0/0/0.0; interface fe-0/0/1.0; }

To enable an interface on the backbone area, see Configuring a Single-Area OSPF Network (Required).

Create the additional area with a unique area ID, in dotted decimal format.

  1. In the Area box, click Add new entry.
  2. In the Area ID box, type 0.0.0.2.
  1. Set the area ID to 0.0.0.2 and add an interface. For example:

    set area 0.0.0.2 interface fe-0/0/0

  2. Repeat Step 1 for each interface on this Services Router that you are adding to the area. Only one interface is required.

    Changes in the CLI are applied automatically when you execute the set command.

Add interfaces as needed to the OSPF area.

  1. In the Interface box, click Add new entry.
  2. In the Interface name box, type the name of an interface on the Services Router and click OK.
  3. Repeat Step 1 and Step 2 for each interface on this Services Router that you are adding to the backbone area. Only one interface is required.
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