vPC is similar to Virtual Switch System (VSS) on the Catalyst 6500s. However, the key difference between vPC and VSS is that VSS creates a single logical switch. This results in a single control plane for both management and configuration purposes. Whereas with vPC each switch is managed and configured independently.
VSS appears as a "single switch", vPC runs on two separated switches.
VSS has a "single control plane", with vPC each switch runs individually.
VSS supports PAGP, vPC supports only LACP (or "static").
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