Performance analysis of DQDB behaviour with priority levels

Abstract

94 49, FAX 39 95 338881 ( * * ) CSATI -P.zza Cappellini 12 95100 Catania-ITALY Tel. 39 95 53 84 44, FAX 39 95 538450 ABSTRACT .Recently some modifications have been introduced into the DQDB access protocol to improve its behaviour in certain operating conditions such as overload.In this paper we focus on the Bandwidth Balancing Method (BBM) which has been introduced into the latest versions of the standard. We present an extended analysis of the behaviour of the protocol with the BBM incorporated, assuming that more than one priority level is active in the network. The results presented are oriented towards evaluation of the effect the BBM has on access delay and bandwidth sharing in overload conditions.