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    "abstract": "MPLS Segment Routing (SR-MPLS) is a method of source routing a packet through an MPLS data plane by imposing a stack of MPLS labels on the packet to specify the path together with any packet-specific instructions to be executed on it. SR-MPLS can be leveraged to realize a source-routing mechanism across MPLS, IPv4, and IPv6 data planes by using an MPLS label stack as a source-routing instruction set while making no changes to SR-MPLS specifications and interworking with SR-MPLS implementations. This document describes how SR-MPLS-capable routers and IP-only routers can seamlessly coexist and interoperate through the use of SR-MPLS label stacks and IP encapsulation/tunneling such as MPLS-over-UDP as defined in RFC 7510.",
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    "authors": [
      {
        "name": "Xiaohu Xu"
      },
      {
        "name": "Stewart Bryant"
      },
      {
        "name": "Adrian Farrel"
      },
      {
        "name": "Syed Hassan"
      },
      {
        "name": "Wim Henderickx"
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      {
        "name": "Zhenbin Li"
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    "doi": "10.17487/RFC8663",
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      "confidence": "high",
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      "confidence": "high",
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      "confidence": "high",
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        "RFC6040",
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        "RFC7510",
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        "RFC7794",
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        "source": "parsed",
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        "source": "resolved",
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