Is the MPLS VPN RD of the AR router globally unique

A VPN-IPv4 address consists of 12 bytes. The first 8 bytes represent the RD and the last 4 bytes represent the IPv4 address prefix. The RDs are used to distinguish IPv4 prefixes with the same address space. IPv4 addresses with RDs are VPN-IPv4 addresses (VPNv4 addresses). After receiving IPv4 routes from a CE, a PE converts the routes to globally unique VPN-IPv4 routes and advertises the routes on the public network. Each service provider can independently allocate RDs . When CEs are dual-homed to PEs, RDs must be globally unique to ensure correct routing.

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