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IPv6 (Internet Protocol version 6) is a revision of the Internet Protocol (IP) developed by the Internet Engineering Task Force (IETF). IPv6 is intended to succeed IPv4.
IPv6 implements a new addressing system that allows for far more addresses to be assigned than with Ipv4.
Multiprotocol Label Switching (MPLS) is deployed by many service providers for establishing their backbone networks.
The Cisco implementation of IPv6 provider edge router over MPLS is called 6PE,and it enables IPv6 sites to communicate with each other over an MPLS IPv4 core network using MPLS label switched paths.