Patent ID: 9077607
Filing Date: 2015-07-07
Classification: H04L

Abstract:
1. A method for filtering update messages received by a border gateway protocol (BGP) capable packet network device, comprising: configuring a policy filter in the packet network device with a filter explicit path attribute, a filter explicit prefix attribute, and a route map including a filter implicit path attribute and a filter implicit prefix attribute; receiving an update message that includes a plurality of message attributes; applying the filter explicit path attribute to the update message prior to applying the route map to the update message; in response to the filter explicit path attribute permitting at least one path in the plurality of message attributes, applying the filter implicit path attribute in the route map to the update message without applying the filter implicit prefix attribute in the route map to the update message; and in response to the filter implicit path attribute in the route map not permitting at least one path in the plurality of message attributes, dropping the update message without applying the filter explicit prefix attribute to the update message.