The Cisco ASR 9900 switch fabric cards are the advanced switch fabrics for the Cisco routers, supporting high-density 100 Gigabit Ethernet line cards. The system architecture of the Cisco switch fabric card is designed to accommodate improved programmable deployment models and convergence of Layer 2 and Layer 3 services, as required by today's wireline, Data-Center-Interconnect (DCI), and Radio Access Network (RAN) aggregation applications.