Modern WAN architectures require additional network capabilities to support current higher bandwidth
and mission-critical applications. Requirements for deploying voice over IP (VoIP) and video
conferencing include high availability, IP multicast, and quality of service (QoS). Today, most
enterprises rely on private WAN connections such as Frame Relay, ATM, or leased-line services to
connect their businesses. When deploying a traditional Frame Relay or ATM-based private WAN,
however, network operations must implement point-to-point or hub-and-spoke architectures that make
provisioning and management of moves, adds, or changes on the network complex. Also, the operational
expense for a private WAN can sometimes be higher...