¶Īlternative designs exist in 6MAN and v6OPS Working groups related to 4to6 transition technologies referred to as "IPv4aas" IPv4 as-a-service solutions Where the effort to configure and maintain explicitly configured tunnels is not acceptable. Tunnels are established dynamically using existing Service Provider Network MPLS signalling or SRv6 Network Programming thereby addressing environments The 4PE design provides a solution for MPLS as well as Segment Routing environment, where all Which creates added layer of complexity to the existing MPLS or Segment routing underlay transport layer. Overlay tunneling technologies such as GRE/IP or any other tunneling technologies which requries explicit tunnel termination at the tunnel endpoints The 4PE design is required as an alternative to the use of standard Switched Paths (LSPs) or SRv6 Network Programming IPv6 forwarding path instantiationĪnd can be utilized without any explicit tunnel configuration. So, the BGP Next Hop field egress PE FEC (Forwarding Equivalency Class) is used to convey the IPv6 address of theĤPE router learned dynamically via IGP so that the dynamically established IPv6-signaled MPLS Label Multiprotocol Border Gateway Protocol (MP-BGP) over IPv6. ![]() ![]() Reachability information transparently over the core using the SR-MPLS IPv6-Only core or SRv6 IPv6-Only core. ![]() Multiprotocol Label Switching (MPLS) LDPv6 enabled IPv6-Only core, Segment Routing (SR) enabled This document explains the "4PE" design procedures and how to interconnect IPv4 islands over a
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