Chuck Robbins is frustrated. The vice president of U.S. channel sales wonders why Cisco, which controls upward of 80 percent of the U.S. market for core routers and switches, didn't fare better in VARBusiness ' 2005 Annual Report Card (ARC) partner-satisfaction study in its area of expertise--data-networking infrastructure equipment. "How can it be that we have the dominant market share, but not the highest level of partner satisfaction?" Robbins asks.