New simulation model for availability evaluation is implemented by discrete-event network simulator ns-3. In this paper the impact of physical length of the SRLGs on network availability is evaluated using Monte Carlo simulation. Such a routing algorithm avoids creating working and spare path pairs that have links contained in the same SRLG, to minimize the negative impact of SRLG failure on logical connection availability. The usual approach to solving this problem consists of introducing more spare capacity to the network and also using a routing algorithm that takes SRLGs into account when computing paths. Specifically, such a failure can cause both working and spare wavelength path of a logical connection between two edge nodes to fail at the same time, leaving them disconnected until a repair is done. digging or earthquake) and causes failures of multiple links. Failure of common resource usually occurs due to physical force (e.g. Such a group, called shared risk link group (SRLG), introduces a situation where a single failure of common resource can cause multiple failures. In optical networks a group of logically distinct links can unintentionally share a physical resource (e.g.
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