Abstract
As virtualization is becoming a promising way to support various emerging application,
provisioning survivability to requested virtual networks (VN) in a resource efficient way is
important. In this paper, we investigate the survivable VN embedding (SVNE) problem from a new
perspective. First, we consider the failure dependent protection (FDP) in which each primary
facility node would have a different backup facility node, as opposed to the Failure Independent
Protection (FIP) which has been studied before, in order to provide the same degree of protection
against a single node failure with less substrate resources. Secondly, we enhance the VN with
additional computing and communication resources and design the Enhanced VN (or EVN) before
embedding it to the substrate in order to further reduce the amount of substrate resources needed
to survive a single facility node failure. The work is the first that combines the FDP with EVN
design (FD-EVN) to explore a resource efficient solution to the SVNE problem. After presenting a
binary quadratic programming (BQP) formulation of the FD-EVN design problem and a Mixed Integer
Linear Programming (MILP) formulation of the EVN embedding (EVNE) problem, we propose two
heuristic algorithms for FD-EVN design, as well as an EVNE algorithm that explores primary and
backup substrate resources sharing. Simulations are conducted to evaluate the performance of the
solutions to the BQP/MILP formulation when possible, and the heuristics. The proposed FD-EVN
approach has shown to be resource efficient and in particular, outperform other approaches in
terms of request acceptance ratio and embedding cost, although as a tradeoff, requiring more
service migration after failures.
© 2013 IEEE
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