  Networking operational costs and environmental concerns have lately driven
the quest for energy efficient equipment. In wired networks, energy efficient
Ethernet (EEE) interfaces can greatly reduce power demands when compared to
regular Ethernet interfaces. Their power saving capabilities have been studied
and modeled in many research articles in the last few years, together with
their effects on traffic delay. However, to this date, all articles have
considered them in isolation instead of as part of a network of EEE interfaces.
In this paper we develop a model for the traffic delay on a network of EEE
interfaces. We prove that, whatever the network topology, the per interface
delay increment due to the power savings capabilities is bounded and, in most
scenarios, negligible. This confirms that EEE interfaces can be used in all but
the most delay constrained scenarios to save considerable amounts of power.
