In this paper, the problem of how to enhance the survivability of network by use of protection in multi-domain
environment is studied. The traditional protection schemes are mainly based on the end-to-end calculation of protection
path, which is fixed through the entire protection path. This inflexibility does not fit well with the multi-domain
networks. Hence, we propose a multi-domain protection (MDP) scheme to solve the problem. It is a domain-oriented
scheme which can allow the protection path of a single connection be interconnected with a series of sections. As a result,
each section of the protection path can be calculated according to the most suitable protection method in each domain.
Simulation results show that MDP can combine various protection methods flexibly and improve survivability of
network obviously. If the protection method in each domain is chosen appropriately, the survivability of network can be
enhanced by 5% with MDP.
For reasons of survivability, many methods have been introduced to Automatically Switched Optical Network (ASON),
such as path protection. In path protection, the protection path is link-disjoint, node-disjoint or risk-disjoint with the
working path, which can improve the survivability of network. The complete risk-disjoint routing algorithm (CRDRA) is
the most popular algorithm in protection path selection at present, in which the links sharing same risk with those
contained in the working path are pruned away from the available resources when calculating protection path. By using
this algorithm, the survivability of network can be enhanced; but the number of connections which can be successfully
routed over current network drops. In this paper, a novel disjoint path selection scheme (DPSS) based on shared risk link
group (SRLG) is proposed. In this algorithm, the risk-sharing links are not removed, but to be partially pruned away
according to their availability and the weight of remained risk-sharing links should be adjusted to a proper value.
Selecting protection path with DPSS, the number of connections that can be successfully routed will increase; in the
mean time we can achieve a relative good survivability. Routing simulations have been done over mesh networks to
compare the suggested DPSS with link-disjoint routing algorithm (LDRA) and CRDRA. With the simulation results, a
conclusion can be made on the performance of different algorithms.
For reasons of survivability, many methods have been introduced to Automatically Switched Optical Network (ASON), such as path protection. In path protection, the protection path is risk-disjoint with the working path, which can improve the survivability of network. The complete risk-disjoint routing algorithm (CRDRA) is the most popular algorithm in protection path selection at present, in which the links sharing same risk with those contained in the working path are pruned away from the available resources when calculating protection path. By using this algorithm, the survivability of network can be enhanced; but the number of connections that can be successfully routed over current network drops. In this paper, a partial risk-disjoint routing algorithm (PRDRA) based on shared risk link group (SRLG) is proposed. In this algorithm, the risk-sharing links are not pruned away but had their weight adjusted to a proper value that is larger than normal value but still comparable. Selecting protection path with PRDRA, improved survivability can be achieved while the number of connections that can be successfully routed over current network is kept from serious decline. Routing simulations have been done over mesh networks to compare the two different algorithms. With the simulation results, a conclusion can be made on the performance of different algorithms.
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