Which VPN ID is reserved as the transport VPN carrying control traffic in Cisco SD-WAN?
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Correct answer: VPN 0.
Why this is the answer
VPN 0 is the correct answer because it is a reserved VPN ID in Cisco SD-WAN used specifically for transporting control plane traffic between SD-WAN devices (vSmart, vBond, vManage, and vEdge/cEdge routers). This includes OMP (Overlay Management Protocol) routes, TLOCs (Transport Locators), and other essential control messages. VPN 1 is typically used for management access to the device itself. VPN 512 and VPN 514 are not reserved for this specific control plane function; they are generally available for data plane services, similar to other VPN IDs in the range of 1-511 and 513-65535.
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