Abstract
Connection oriented packet networks such as IP/MPLS can better meet QoS guarantees in terms of delay jitter, bandwidth etc. These connection oriented networks are more vulnerable to failures that could be classified into link/path and degraded failures. Virtual Path Hopping (VPH) concept discussed here eliminates terminations of data communications in data plane due to degraded failures detected by control plane timers. Dynamic Virtual Path Allocation (DVPA) algorithm proposed here can achieve very fast recovery for premium traffic (PT) from link/path failures while keeping efficiency of network high. This recovery time consists of two main parts; time taken to detect failures and time taken to activate backup path. DVPA algorithm virtually makes time taken to activate backup path `zero' for PT as it uses active backup path. DVPA algorithm maintains a VP-pool between ingress and egress and two or more VPs will be active at any given time, depending on traffic. Also DVPA algorithm makes sure that active backup path is always occupied by best effort traffic (BET) when there are no failures, increasing efficiency of network. According to simulation results, implementing DVPA algorithm in conjunction with VPH concept can achieve a very high availability for PT in future IP/MPLS.
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