The main issue to solve for ATM multicast forwarding is the cellinterleaving problem using AAL5. In strategies using a multiplexing ID, there are two main options: to assign an ID per source or per PDU. This paper argues for the convenience of using PDU ID because it allows the share of IDs between all the senders, thus reducing the ID consumption and management complexity. Compound VC (CVC) goes a step beyond in proposing a variablelength ID to adapt to the group size and to reduce the

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... introduced by the multiplexing ID. The size of this ID is negotiated at connection establishment according to the traffic and group characteristics. This paper provides some hints towards obtaining some dimensioning rules for the number of IDs based on its dependencies on traffic and group parameters.