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In view of both the growing dynamic traffic and increasing costs, in future, network operators will have to adopt a multi-period network planning technique that aims to jointly account for the upgrade of both the network, and the optical and the IP edges. In the current work, for an IP-over-Elastic Optical Network, we propose a multi-layer network planning technique that is multi-period in nature, i.e. the approach relies on efficient forecasts for a short-term increase in the volume. We formulate the problem as an integer linear programme with the aim of reducing the (i) capital expenditure (CapEx) – by minimizing the addition of any equipment every period and (ii) operational expenditure (OpEx) – by minimizing any displacement(s) of the equipment and reconfiguration(s) in successive periods. We conduct extensive simulations considering realistic networks to validate the proposed network planning technique. The …