Understanding Route Distinguishers in an MPLS Network

C.

In an MPLS network, route distinguishers (RD) are used to uniquely identify VPNv4 address prefixes. Each VPNv4 prefix must have a unique RD assigned to it. The RD is used in conjunction with the IPv4 address prefix to create a VPNv4 address.

Option A is incorrect because route distinguishers do not allow multiple instances of a routing table to coexist within the edge router. Instead, they enable the identification of unique VPNv4 prefixes to avoid overlapping addresses across the MPLS network.

Option B is also incorrect because label bindings are performed by the Label Distribution Protocol (LDP) or the Resource Reservation Protocol (RSVP) in MPLS networks, and not by route distinguishers.

Option D is incorrect because route targets (RT) are used to define which prefixes are imported and exported on the edge router in MPLS VPNs, not route distinguishers.

Therefore, the correct answer is Option C. Route distinguishers make a unique VPNv4 address across the MPLS network.