Journal of Network and Systems Management
Optimal maintenance of a spanning tree
Journal of the ACM (JACM)
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ATM networks are currently moving from the experimental stage oftest-beds to a commercial state where production networks aredeployed and operated. The ATM Forum PNNI (Private Network toNetwork Interface) standard introduces an architecture suited foran internetwork which, in principle, can also be used as anintra-network nodal interface. However, the current PNNI fallsshort in providing an acceptable solution due to severe performancelimitations in intra-network operation, limited functionality andthe lack of open interfaces for functional extensions andservices.OPENET is a common, open and high-performance network controlplatform based on performance and functional enhancements to thePNNI platform. It is designed to address the issues ofinteroperability (being vendor independent), scalability (in termsof network size and volume of calls), high performance (in terms ofcall processing latency and throughput) and functionality. OPENETis mainly an intra-networking extension to current PNNI. It iscompatible with PNNI in the internetwork environment where largenetworks must be partitioned according to natural topological ororganizational boundaries.The major novelty of the OPENET architecture (compared to thecurrent PNNI) is its focus on network control performance. Aparticular emphasis is given to the increase of the overall rate ofconnection handling, to the reduction of the call establishmentlatency and to the efficient utilization of the network resources.These performance enhancements are achieved by the use of a nativeATM distribution tree for the dissemination of utilization update,light-weight call setup, take down and modification signaling, theuse of fast setup and takedown with the future option to implementthem in hardware, and extensive use of caching and pre-calculationfor route computation. OPENET also extends PNNI in terms offunctionality. It utilizes a new signaling paradigm that bettersupports fast reservation and multicast services, a rich controlcommunication infrastructure which enables the development ofaugmented services leveraging the existing functions, messagingsystem and information of the network control platform.