Which tag is used by the PE router to forward the packet to the correct customer?
The Route Target is the extended community attached to a VPNv4 route that controls which VRF(s) import it, so a PE router installs a prefix only into the customer VRF whose import route-target matches, ensuring traffic is forwarded into the correct customer's routing context rather than another customer's. The Route Distinguisher only makes otherwise-identical customer prefixes unique across MP-BGP so they can coexist without collision; it plays no role in deciding which customer's VRF ultimately receives the route.
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