Sublime Text 2 Syntax Definitition for Cisco router/switch/firewall configurations. This package will highlight Cisco configuration and commands within Sublime Text 2.
Without Git: Download the zip from github, and extract the files to your Sublime Text "Packages" directory, into a new directory named Cisco. You can find the packages directy by going to Preferences -> Browse packages, within Sublime Text 2.
With Git: Clone the repository in your Sublime Text "Packages" directory:
git clone git://github.com/tunnelsup/sublime-cisco-syntax.git
Once installed navigate to View->Syntax->Cisco to apply the Cisco syntax to the document.
This syntax definition will automatically be applied to .txt files and .cfg files.
Once Cisco syntax is turned on you can then try different color schemes by going to Preferences -> Color Schemes.
If you wish to customize this even further for your own needs navigate to the Cisco package (Preferences -> Browse Packages). Edit the Cisco Definitions.json-tmlanguage file within Sublime Text 2. After your changes go to Tools -> Build, to rebuild the syntax definitions.
See official website for further information and discussion. http://www.tunnelsup.com/tup/2013/03/29/sublime-text-2-cisco-syntax-and-snippets