# BGP Aggregation

As the number of BGP router addresses in an autonomous system grows, each router in the AS requires more memory and CPU time to process all the addresses from the routing table. BGP provides a technique, called aggregation, that can reduce the size of a router's routing table. Aggregation summarizes a range of addresses into a single route entry.

### To Create an Aggregate Route Entry

1. Enter the necessary information:

Aggregate State: Click Enable to turn on BGP address aggregation. Click Disable to turn off this feature.

IP/Netmask: Specify the IP address and subnet mask of the new aggregate address.

AS Set: Select this option to include the AS paths of all contributing routes in the AS-Set field.

Suppress Option: Specifies which more-specific routes should be filtered out (suppressed) from routing updates.

Summary Only: Select this option to direct BGP to suppress all more-specific routes.

Route Map: Select the route map that specifies the more-specific routes that are to be filtered out from routing updates.

Advertise Map: Select the route map to match routes for the AS-Path attribute of the aggregate route entry.

Attribute Map: Select the route map that sets the attributes of the aggregated route.

2. Click Add to add this entry.

3. Click OK to save the settings and return to the Virtual Router Basic Configuration page. Click Apply to save the settings and to continue configuring BGP.

The WebUI displays the summarized IP address.

### To Remove an Aggregate Route Entry

1. Click Remove in the Action column of the aggregate address that you want to delete.

A system message prompts you to confirm the removal.

2. Click OK to confirm the removal, or Cancel to cancel it.

## Other Configurations

From this page, you can perform the following configurations:

### To Configure Basic BGP Parameters

To configure basic BGP settings, see BGP Virtual Router Settings.

### To Configure a Confederation

To configure BGP confederations, see BGP Confederations.

### To Specify Reachable Networks

To specify networks that are reachable from the virtual router, see BGP Network Setting Configuration.

### To Configure BGP Communities

To configure BGP communities, see BGP Communities.

### To Configure Redistribution Rules

To configure conditions to redistribute routes to the current BGP router, see BGP Redistribution Rules.

### To Configure BGP Neighbors

To configure BGP neighbors, see BGP Neighbors.

### To Configure BGP Peer Groups

To configure BGP peer groups, see BGP Peer Groups.

### To Configure an AS-Path Access List

To configure an AS-Path access list, see BGP AS-Path Access List Configuration.