scope:

This Recommendation includes a broad consideration of approaches toward achieving end-to-end IP performance objectives on as many UNI-UNI paths as possible, including some detailed examples of how some approaches might work in practice. Examples include how service providers might handle cases where the aggregated impairments exceed those specified in a requested QoS class (such as those of [ITU-T Y.1541]).

The advantages and disadvantages of each approach are evaluated to the extent currently possible.

For the purposes of this Recommendation, dynamic inter-AS routing using border gateway protocol (BGP) is assumed as per current practices.

Other approaches for achieving end-to-end IP performance objectives have been mentioned, such as a "Costed Bids Method" and "Bid Discovery Using a Global Registry". As these methods differ fundamentally from those treated here, with significantly different implications for deployment, these and other possible approaches are for further study.