NBBS traffic management overview

H. Ahmadi, P. F. Chimento, R. A. Guerin, L. Gun, B. Lin, R. O. Onvural, T. E. Tedijanto
1995 IBM Systems Journal  
In this paper, we describe an integrated set of procedures used for bandwidth management and congestion control in high-speed packetswitched networks such as asynchronous transfer mode (ATM), which are part of IBM's Networking BroadBand Services (NBBS) architecture. These controls are designed to support a wide variety of services with different characteristics in the network and operate at different time scales: connection-level controls such as path selection, admission control and bandwidth
more » ... llocation, and packet-level controls that discriminate between packets from different connections to support multiple levels of service guarantees. Connection-level controls are applied at connection setup time and are based on the connection characterization and the network state at that time. They perform efficient allocation of resources to ensure performance guarantees for connections while achieving high utilization of network resources. Various packetlevel controls developed include access or rate control and intermediate node buffer management and scheduling. For connections that do not require explicit service guarantees, NBBS offers an available bit rate service. This service mostly relies on packet-level control in the form of an end-to-end rate-based flow control algorithm that regulates the flow of traffic into the network. This paper, in addition to providing an overview of the different mechanisms used for traffic management in NBBS, highlights how they interact to ensure efficient network operation. Wopyright 1995 by International Business Machines Corporation. Copying in printed form for private use is permittedwithout payment of royalty provided that (1) each reproduction is done without alteration and (2) theJournal reference and IBM copyright notice are included on the first page. The title and abstract, but no other portions, of this paper may be copied or distributed royalty freewithout further permission by computerbased and other information-service systems. Permission torepublish any other portion of this paper must be obtained from the Editor. 604 AHMADI ET AL.
doi:10.1147/sj.344.0604 fatcat:34fdczyro5f73eg52wpofmbg4y