For several years were actively developing solutions for creation regional cross-border gateways that allowed to implement high performance, reliable and effective connections between national scientific -educational networks in the East Europe. Created and proposed for implementation connections are used for providing access of regional NRENs to Trans-European academic infrastructure GEANT (the pan-European data network for the research and education community). However, external optical gateways without developed internal connectivity at national level cannot solve the main problem -to provide high speed and cost effective access for end users to GEANT resources and services. To eliminate the existing misbalance in the networking infrastructure in RENAM was elaborated a project of national optical networking backbone upgrading. The project is focusing on transferring internal backbone to utilization of modern routing and switching equipment that will allow implementing new communication technologies. Upgraded optical infrastructure will significantly improve access to the wide range of GEANT network services and resources for national users' communities.