I think routers and switches configuration files, commands and results are boring even with tcolorbox bells and whistles. In any case this is something I've found in my computer:
\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{booktabs}
\usepackage{etoolbox}
\usepackage[most]{tcolorbox}
\newtcblisting{cisco}[1][]{size=fbox, listing only, listing options={style=tcblatex,basicstyle=\ttfamily\scriptsize,tabsize=2,language=sh},#1}
\begin{document}
\begin{frame}[fragile]{cisco}
\begin{cisco}[title=Example of cisco command]
master#show ip cef 10.200.254.4
10.200.254.4/32, version 44, epoch 0, cached adjacency 10.200.200.2
0 packets, 0 bytes
tag information set, all rewrites owned
local tag: 20
fast tag rewrite with Eth0/0/0, 10.200.200.2, tag imposed {18} via 10.200.200.2, Ethernet0/0/0, 0 dependencies
next hop 10.200.200.2, Ethernet0/0/0
valid cached adjacency
tag rewrite with Et0/0/0, 10.200.200.2, tags imposed {18}
\end{cisco}
\end{frame}
\end{document}

not blandandnot boringwith Cisco IOS commands in mind ;-) – Ignasi Mar 10 '16 at 16:22