QoS Policy Propagation via BGP (QPPB), ez a feature lehetőséget ad arra hogy BGP attribútumokat és prefixeket képezzünk le CEF paraméterekre. Ezzel forgalom szabályokat tudunk érvényesíteni, és átvinni a hálózaton. Joe Harris oldalán található róla egy leírás. Leírás a cisco oldalán: Configuring QPPB

The Border Gateway Protocol (BGP) is an interdomain routing protocol that exchanges reachability information with other BGP systems. It is defined by RFC 1163. The Policy Propagation via BGP feature allows you to classify packets based on the following: • Access lists. • BGP community lists. A community is a group of destinations that share some common attribute. You use community lists to create groups of communities to use in a match clause of a route map. As with access lists, a series of community lists can be created. • BGP autonomous system paths. An autonomous system path is a collection of networks under a common administration sharing a common routing strategy. BGP carries the autonomous system path in its routing updates. You can filter routing updates by specifying an access list on both incoming and outbound updates based on the BGP autonomous system path. • IP Precedence. See the section " About IP Precedence" earlier in this chapter. • Source and destination address lookup. You can specify whether the IP Precedence level is obtained from the source (input) address or destination (output) address entry in the route table. After a packet has been classified using BGP, you can use other QoS features such as CAR and WRED to specify and enforce business policies to fit your business model. BGP Policy Propagation leverages BGP to distribute QoS policy to remote routers in your network. It allows ingress routers to prioritize incoming traffic.

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