The QoS policy propagation via BGP feature was introduced in Cisco IOS Release 11.1(17)CC. With Release 11.1(20)CC, the QoS policy propagation via BGP feature has the following enhancements:
QoS group ID---You can set an internal QoS group ID that can be used later to perform rate-limiting or weighted fair queuing based on the Qos group ID. In the previous release you could only set up to eight IP precedence level to classify packets. By setting the QoS group ID in addition to the IP precedence, you can now have more than eight classes on which to perform rate-limiting or weighted fair queuing.
Source and destination address lookup---You can specify whether the IP precedence level or QoS group ID used is obtained from the source (input) address or destination (output) address entry in the route table. In the previous release you could only use the destination address. You can now specifying the input or output address.
For more infrmation : http://www.cisco.com/univercd/cc/td/doc/product/software/ios111/cc111/bgpprop.htm
