Within an MPLS VPN, what does the PE convert an IPv4 prefix into?

In an MPLS VPN, when a PE router receives an IPv4 prefix from a connected CE router, it converts this into a VPN-IPv4 prefix. This is done by prepending a 64-bit Route Distinguisher (RD) to the standard 32-bit IPv4 prefix, creating a unique 96-bit VPN-IPv4 address. This ensures that identical IPv4 prefixes from different VPNs remain distinct within the MPLS backbone. The eBGP path association is a routing protocol concept, not a prefix conversion. Combining ASN, PE router-id, and IP prefix is not the standard format for VPN-IPv4. A 48-bit route combining IP and PE router-id is incorrect; the RD is 64 bits and the combined prefix is 96 bits.