Cisco has more formats. EPS ought be preferred. PPT could work to import & convert from Libre Impress. Can always get a Visio trial, and convert the art from there.
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, brochures, posters and many other documents.
![Libreoffice Draw Network Diagram Template Libreoffice Draw Network Diagram Template](https://i.ytimg.com/vi/_PqtXx_u2oM/maxresdefault.jpg)
Also--
- Cisco icons,
http://www.cisco.com/web/about/ac50/ac47/2.html - Cisco pt2,
http://www.cisco.com/c/en/us/solutions/enterprise/design-zone-smart-business-architecture/cvd.html - Visio Trial,
http://www.microsoft.com/en-us/evalcenter/evaluate-visio-professional-2013
Interesting, but haven't tried the Libre converter. That is, the latest version & all that--