This contribution proposes an algorithm for aggregating ABR virtual channel connections (VCCs) onto ABR virtual path connections (VPCs). ABR VPCs are particularly useful for connecting enterprise sites over the Internet, providing a virtual private network (VPN). The VPC/VCC hierarchy is also important for supporting Internet differentiated services over ATM. The coupling between the flow control mechanisms for VCCs and VPCs is not standardized. In this contribution, we propose fairness definitions for VPC bandwidth allocation, and describe an explicit rate algorithm for allocating the VPC capacity to the multiplexed VCCs. Preliminary simulation results indicate that the algorithm achieves the required fair allocations, while controlling queue sizes.

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