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I forgot to mention that the Cisco icons could be found here http://www.cisco.com/web/about/ac50/ac47/2.html. Not that it really matters.

Hello everyone!
I'm trying to draw a network diagram using tikz and Cisco symbols.
I have the cisco symbols in the folder figs/Cisco/3015_eps/
When I use the following code:

\usepackage{tikz}
\usetikzlibrary{chains}
\usetikzlibrary{positioning}
\usepackage{epstopdf}
\begin{tikzpicture}
[start ...