Abstract
Two energy saving approaches, called Fixed Upper Fixed Lower (FUFL) and Dynamic Upper Fixed Lower (DUFL), switching off idle optical Gigabit Ethernet (GbE) interfaces during low traffic periods, have been implemented on a testbed. We show on a simple network scenario that energy can be saved using off-the-shelf equipment not explicitly designed for dynamic on/off operation. No packet loss is experienced in our experiments. We indicate the need for faster access to routers in order to perform the reconfiguration. This is particularly important for the more sophisticated energy saving approaches such as DUFL, since FUFL can be implemented locally.
Highlights
Variation of traffic over day and night in backbone networks offers the opportunity to save energy by deactivating some network devices in low-demand hours
We validate the feasibility of implementation of two algorithms referred to as Fixed Upper Fixed Lower (FUFL) and Dynamic Upper Fixed Lower (DUFL) [2,3,4] on a testbed
We focus on two classes of approaches to calculation of network configuration [2, 3], namely, FUFL and DUFL
Summary
Variation of traffic over day and night in backbone networks offers the opportunity to save energy by deactivating some network devices (or their parts) in low-demand hours. The challenges (corresponding to steps schematically depicted in Figure 1) include (1) accurate monitoring of traffic data; (2) timely triggering network reconfiguration; (3) fast calculation of the desired (energy-efficient) network configuration; (4) the reconfiguration itself including signaling and the time needed to activate or deactivate the devices and potentially to reroute traffic. Issues such as network stability, increased delay, jitter, or even packet loss may occur in the network, which is crucial in the backbone. Our experiments show that it is possible to automatically and remotely switch on and off network interfaces in a dynamic manner using off-the-shelf equipment
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