vPC Data Plane Operation
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vPC technology is designed to always forward traffic locally when possible. In a normal network condition, vPC peer link is not used for the regular vPC traffic and is considered to be an extension of the control plane between the vPC peer switches. The vPC peer link carries the following type of traffic:

Image vPC control traffic, such as Cisco FSoE, BPDUs, and LACP messages

Image Flooding traffic, such as broadcast, multicast, and ...

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