VP's Priority Based Restoring Function Enhanced Self-healing Algorithm

Komwut WIPUSITWARAKUN  Hideki TODE  Hiromasa IKEDA  

IEICE TRANSACTIONS on Communications   Vol.E81-B   No.11   pp.2100-2109
Publication Date: 1998/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Performance and Quality of Service (QoS) of Multimedia Networks)
Category: ATM Networks
network survivability,  self-healing algorithm,  failure restoration,  

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Network survivability against various unexpected failures is one of indispensable technologies for the B-ISDN infrastructure. Self-healing algorithm is the technique to automatically restore the failed VP's (virtual paths) in the backbone ATM network. Since the B-ISDN transports various kinds of traffic with various levels of priority (Grade of Service: GoS), the effective self-healing algorithm should orderly restore the failed VP's based on the priority of their traversing traffic. This paper proposes the priority based restoring self-healing algorithm, which realizes the priority based restoring function by the two-timer mechanisms and a simple capacity reserving protocol. The simulation results show that the proposed algorithm can schedule the restoration process so that the failed VP's with higher priority are restored before the others with lower priority. In addition, the significant improvement in restoration speed for the highest priority traffic class has been achieved.