Summary

Existing quality of service (QoS) class standardization for packet-based layer 2 and layer 3 services is largely non binding or missing. Recommendation ITU-T Y.1566 intends to simplify technical Ethernet, multiprotocol label switching (MPLS) and internet protocol (IP) QoS interconnection negotiations. Four ordinary classes and four auxiliary classes have been defined. This set of classes covers a wide range of transport service offerings.

The Recommendation gives guidance on how to deal with issues resulting from differences in QoS deployments of interconnecting service providers, aiming at the preservation of the original intent of the service.