Abstract:
Deficiency of flexibility and programmability of
legacy network architecture has been the concern of
many networking admirers for some years. Software
defined networking (SDN) is a new emerging concept
to logically centralize the network control plane in
order to automate the configuration of individual
network elements. However, the failures of SDN
controller are every large impact on the network
performance and availability. There are different
failure modes in SDN controller outages such as
hardware and software. Unplanned downtime is
mostly caused by software failure due to software
aging rather than hardware failure. The aging related
faults have a huge effect on the availability for
software components, SDN controllers. For that
reason, the work presented in this paper offers the
availability model for software aging of SDN
controllers by applying software rejuvenation. A
stochastic reward net (SRN) is proposed to evaluate
the availability assessment of a cluster of SDN
controllers. And then how software rejuvenation can
improve the performance of SDN controllers is
studied. To evaluate the availability of proposed
model, mathematical analysis is performed.
