Lessons Learned in Interconnecting Sandia's Network Backbone Routers to a Core ATM Switch

We learned some valuable lessons during the migration of the corporate unclassified production network's Cisco Systems 7000 series routers to the Lucent Technologies GlobeView 2000 ATM switch. This paper documents those lessons learned and discusses in some detail each phase of the migration process. The unclassified production network at Sandia National Laboratories consists of various telecommunications devices. Some of the devices include Cisco routers, Cisco Asynchronous Transfer Mode (ATM) and Ethernet switches, and Bay Networks hubs. The Cisco 7000 series routers and some LightStream 1010 (LS1010) ATM switches are interconnected with the GlobeView ATM switch at the core of the network. Prior to introducing ATM into the production network, the Cisco routers were interconnected on a Fiber Distributed Data Interface (FDDI) ring at the core with High Speed Serial Interface (HSSI) point-to-point connections to remote routers in various geographic locations throughout Sandia's campus.