scope:

[ITU-T Y.2111] defines general requirements for resource and admission control functions for next generation networks (NGN). These requirements are independent of the underlying transport technology.

Multiprotocol label switching (MPLS) is considered to be a key transport technology in core networks. In particular, networks which use MPLS with traffic engineering (MPLS-TE) capabilities provide significant assurance that the delivery of the desired quality of service (QoS) for a variety of services and applications will occur.

Resource and admission control functions (RACF) are used to control the flow of traffic from access networks into the MPLS core [ITU-T Y.2111]. A distributed architectural structure of one RACF functional entity, the transport resource control functional entity (TRC-FE) is considered in this Recommendation. In this architectural arrangement, MPLS transport resource information is available in label edge routers (LER) and gateways connected to the LERs. This Recommendation defines the distributed architecture for the TRC-FE and specifies supporting requirements.