A router providing differentiated services while transporting Internet
Protocol (IP) packets on an asynchronous transfer mode (ATM) backbone. A
network administrator may specify multiple precedence values (in the type
of service (TOS) portion of an IP header) associated with each SVC (set
up with desired QOS). IP packets with the specified precedence values are
transported on the associated SVC. By associating different precedence
values with different SVC and configuring different SVCs with different
QOS, differentiated services may be provided to IP packets.