There are numerous reasons you might want to implement MPLS/VPN technology in your enterprise WAN; in most cases you have to provide local or end-to-end layer-3 isolation between different groups of users.
The “When should companies consider building MPLS networks into their WANs?” article I wrote for SearchEnterpriseWan lists a few of the scenarios (Himawan Nugroho’s blog describes another case study). If you’re looking for in-depth use cases, technology overviews and sample (working & tested) configurations, register for my Enterprise MPLS VPN Deployment webinar.
We migrated our blog a few days ago, and the commenting functionality is not there yet. In the meantime please find our content on LinkedIn and comment there.