A restoration strategy based on PNNI routing in ATM networks

As network speeds increase, the effects of network facility failures (link and/or switching node) can be devastating both to the end users and service providers, depending on the nature of the affected applications. Hence robustness in broadband communication networks, i.e., continued service provision in the event of network failures, is an important issue and has received significant attention. While most prior work in this regard has focused on incorporating redundancy to provide uninterrupted services, in this paper we propose and analyze a restoration scheme based on the PNNI (private network-network interface) signalling and routing protocols for ATM networks. This restoration scheme utilizes the existing unused resources of the underlying network in order to restore the affected connections during network failures. Detailed performance and complexity trade-offs analysis has been conducted. Our results indicate that for the network studied in this paper, a restoration scheme based on PNNI is an attractive option.