LAN/WAN interconnection : congestion control in X.25 protocol relays

Abstract

This paper addresses the problem of congestion control in X.25 protocol relays for LAN/WAN interconnection. Load/throughput and load/transit delay curves are evaluated for different load situations, and for different traffic patterns such as interactive and batch traffic. The results show that, although the relay can always stay away from the congestion collapse situation due to the X.25 built-in flow control mechanisms, it can not guarantee fairness in the sharing of the relay internal resources and bandwidth among the active connections. The conclusions point to some possible solutions to this problem.