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Route filtering
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<p>In the context of <a href="/facts/Network_routing/Ml6MVCaC">network routing</a>, route filtering is the process by which certain routes are not considered for inclusion in the local route database, or not advertised to one's neighbours. Route filtering is particularly important for the <a href="/facts/Border_Gateway_Protocol/XfYgBzW3">Border Gateway Protocol</a> on the global <a href="/facts/Internet/Xw1rVvJU">Internet</a>, where it is used for a variety of reasons. One way of doing route filtering with external-resources in practice is using <a href="/facts/Routing_Policy_Specification_Language/gkJSrUMR">Routing Policy Specification Language</a> in combination with <a href="/facts/Internet_Routing_Registry/IfIvuC9R">Internet Routing Registry</a> databases. </p>