This paper describes about the adoption of Carrier Ethernet is causing the creation of large Layer 2 domains that require fast and predictable convergence. In particular, Service providers require fast convergence to support video and voice services for their triple-play deployments. Moreover, this mechanism for resilient failovers must be flexible and it must support complex ring topologies. It also should support fast convergence when scaling the number of VLANs and MAC addresses. Consequently, Cisco® has designed a new Resilient Ethernet Protocol (REP) that meets these requirements for fast and predictable convergence in Layer 2 ring topologies.
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