The Catalyst 8500 CSR family of Campus Switch Routers provides the next-generation switching paradigm for both switching performance and critical network services. Including support for all IP and IPX routing standards, the Catalyst 8500 CSR family of campus backbone switches offers a complete suite of sophisticated features. The Catalyst 8500 CSR family contains several key components of the new enterprise campus network architecture, providing for high-speed performance, resiliency, quality of service (QoS), and security within the network backbone. With new ATM and Packet-over-SONET uplinks, the Catalyst 8540 CSR delivers metropolitan area network (MAN)/wide area network (WAN) solutions with scalable performance, lower cost of ownership, and the features needed in New World Networks.The Catalyst 8500 CSR family offers a complete set of campus-required features such as Hot Standby Router Protocol (HSRP), Protocol Independent Multicast (PIM) for multicast routing, and a full set of routing protocols, including Routing Information Protocol (RIP), RIP version 2, Open Shortest Path First (OSPF), Interior Gateway Routing Protocol (IGRP), Enhanced IGRP, and Border Gateway Protocol (BGPv4). As QoS mechanisms become more important in the campus, the Catalyst 8500 CSR family provides, in its first phase, four queues per port based on IP precedence. In the following phase, the Catalyst 8500 CSR family will provide support for a more granular method of determining QoS and ensuring minimal latency and packet loss for mission-critical applications.