Applying ASPath Filters

AS-path filters that are configured on a router select those routes that are allowed. Routes that are selected behave as described here:

■ The selected routes enter the local BGP table when the selection is applied on the incoming routes from a neighbor; routes that are not selected are silently dropped.

■ The selected routes are transmitted to the neighbor when the selection is applied on the outgoing routes to the neighbor; routes that are not selected are used locally but are never sent to the neighbor.

© 2005, Cisco Systems, Inc. Route Selection Using Policy Controls 3-29

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