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In the traditional port channel model, link aggregation was only possible to a single device. MEC and vPC are two new port channel concepts that extend link aggregation across two physical switches. MEC and vPC address the multitude of new network connectivity challenges where link aggregation connectivity across two devices is required. There are a number of benefits that VSS and vPC bring to network designs. Some of the major benefits of both of these technologies include: utilizes all available uplink bandwidth, allows the creation of resilient Layer 2 topologies based on link aggregation and eliminates the dependence of Spanning Tree Protocol in Layer 2 access distribution layer(s).
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