# BGP Communities

A BGP community consists of routes that share a common attribute. A BGP community specifies a destination grouped into a logical unit to make it easier to apply routing policies. By performing global configurations for a community of routes, you reduce the amount of tasks, time, CPU work, and memory needed to set parameters for each route. Once you have established which routes you want to include in your community, you create a community list to which you add the IP addresses of the desired routes.

### To Create a Community List

1. Enter the necessary information:

Community List ID: A value that identifies the community list that contains the list of remote networks.

Permit: Denies or permits BGP traffic for routers with entries in the community list.

Comm Type: This section specifies the community parameters:

as: Select this option if the NetScreen device will not advertise the listed network destinations to other autonomous systems.

no advertise: Select this option if the NetScreen device will not advertise the listed network destinations to any peer devices.

no-export: Select this option if the NetScreen device will not advertise the listed network destinations to EBGP peers, except sub-autonomous systems within the confederation.

no-export-subconfed: Select this option if the NetScreen device will not advertise the listed network destinations to any peer devices grouped in a confederation.

AS number: Enter the ID number of the AS.

final two octets: Enter the ID number of the community value.

2. Click Add in the Action column.

The network is added to the list.

### To Remove a Route from a Community

1. Click Remove in the Action column of the route 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 Redistribution Rules

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

### To Configure an Aggregate Address

To configure an aggregated BGP address, see BGP Aggregation.

### 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.