# Configuring an area aggregate range

Use the following procedure to configure OSPF area aggregate ranges to reduce the number of link state advertisements that are required within the area. You can also control advertisements.

## Prerequisites

- Install the Advanced License.

- Enable IP routing globally on the switch.

- Assign an IP address to the VLAN that you want to enable with OSPF.

  Routing is automatically enabled on the VLAN when you assign an IP address to it.

## Procedure steps

1. From the navigation tree, double-click IP Routing.

2. In the IP Routing tree, double-click OSPF.

3. In the work area, click the Area Aggregate tab.

4. Click Insert.

5. Using the fields provided, create the new area aggregate.

6. Click Insert.

## Variable definitions

The following table describes the fields of the Area Aggregate tab.

Field | Description
--- | ---
AreaID | Specifies the unique identifier of the Area this address aggregate is found in.
LsdbType | Specifies the type of address aggregate. This field specifies the link state database type that this address aggregate applies to. Options available are: summaryLink or nssaExternalLink.
IpAddress | Specifies the IP address of the network or subnetwork indicated by the aggregate range.
Mask | Specifies the subnet mask that pertains to the network or subnetwork.
Effect | Specifies the aggregates effect. Subnets subsumed by aggregate ranges either trigger the advertisement of the indicated aggregate (advertiseMatching value) or result in the subnet not being advertised at all outside the area. Select one of the following types: AdvertiseMatching: advertises the aggregate summary LSA with the same LSID DoNotAdvertiseMatching: suppresses all networks that fall within the entire range AdvertiseDoNotAggregate: advertises individual networks
AdvertiseMetric | Specifies the advertisement metric associated with this aggregate. Enter an integer value between 0 and 65535, which represents the metric cost value for the OSPF area range.