RFC1483 describes two different methods for carrying connectionless network interconnect traffic over an ATM network: Routed protocol data units (PDUs) and Bridged PDUs.
- Routing allows multiplexing of multiple protocols over a single ATM virtual circuit (VC). The protocol of a carried PDU is identified by prefixing the PDU with an IEEE 802.2 Logical Link Control (LLC) header.
- Bridging performs higher-layer protocol multiplexing implicitly by ATM virtual circuits. For more information, refer to RFC1483.