A Point to Point Protocol (“PPP”) link running PPP Multilink Protocol with multi-class extensions (“Multilink-Extension”) having both peers on the PPP link support a number of egress priority queues negotiated during the Multilink-Extension negotiation. Each peer also establishes a number of classes equal to the negotiated number of egress priority queues. Thus, communication devices that have a different default number, or different maximum number, of egress priority queues can interoperate in a manner that ensures packets have the same per-hop behavior (“PHB”). The present invention is both memory efficient and processing time efficient because only the minimum number of egress priority queues necessary are instantiated.