Abstract

Tolly Group Report #202146 (September 2002) validates Fujitsu’s GeoStream R920/R980 IP Switching Node for carrier-core use. Tests confirmed 100% line-rate forwarding of 64-, 512-, and 1,518-byte frames across eight Gigabit-Ethernet ports for IPv4, IPv6, and mixed traffic, with microsecond-class latency (≈48 µs at 64-byte IPv4, ≈60 µs at 64-byte IPv6).

Service-provider features held under load. The platform supported 32,000 simultaneous BRAS sessions, established VPLS multipoint bridging, and interoperated with Cisco 7206 and Juniper M5/M20 in MPLS-VPN scenarios. MPLS-TE drills showed hitless protection: cable-pull failures triggered LSP switchover in 916 µs, while CLI-initiated transitions took 452 µs, both well inside the 50 ms carrier window.

Quality-of-service and traffic-engineering exercises demonstrated effective per-class bandwidth enforcement and congestion isolation. DiffServ EF streams kept 100% of offered load during oversubscription, and DiffServ AF queues held a programmed 4:2:1 Gold/Silver/Bronze ratio under full load. Together these results show the GeoStream R920/R980 delivers wire-speed IPv4/IPv6 forwarding, rapid MPLS recovery, large BRAS scale, and standards-based QoS, making it a robust backbone choice for converged IP/MPLS networks.