BGP Aggregation

As the number of Border Gateway Protocol (BGP) router addresses in an autonomous system (AS) 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.

The Virtual Router (BGP) - Aggregate Address page supports both Internet Protocol version 4 (IPv4) and Internet Protocol version 6 (IPv6) if you set the IPv6 environment variable. The first area is for IPv4 parameters, and the second area is for IPv6 parameters. If IPv6 is not enabled, the second area will not appear.   

To Create an Aggregate Route Entry

This procedure applies to both IPv4 and IPv6 if you set the IPv6 environment variable. Unless otherwise indicated, the descriptions of the user interface are the same for both protocols.

  1. Enter the necessary information:

Aggregate State: Select Enable to turn on IPv4 BGP address aggregation. Select Disable to turn off this feature.

IPv6 Aggregate State: Select Enable to turn on IPv6 BGP address aggregation. Select Disable to turn off this feature.

(IPv4) IP/Netmask: Specify the IP address and subnet mask of the new aggregate address.

(IPv6) IP/Mask-length: Specify the IP address and mask length of the new aggregate address.

AS Set: Includes 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. Select one of the following:

Summary-Only: Directs BGP to suppress all more-specific routes.

Route Map: Directs BGP to suppress the more-specific routes that are specified by a route map. From the list, select a route map.

Advertise Map: Matches routes for the Advertise attribute of the aggregate route entry based on a route map. Select the route map.

Attribute Map: Sets the attributes of the aggregated route based on a route map. Select the route map.

  1. Click Add to add this entry.

  2. 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.

  1. 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, seeBGP 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, seeBGP Communities.

To Configure Redistribution Rules

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

To Configure BGP Neighbors

To configure BGP neighbors, seeBGP Neighbors.

To Configure BGP Peer Groups

To configure BGP peer groups, seeBGP Peer Groups.

To Configure an AS-Path Access List

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

 

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