{
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  "docId": "RFC5556",
  "document": {
    "abstract": "Current IEEE 802.1 LANs use spanning tree protocols that have a number of challenges. These protocols need to strictly avoid loops, even temporary ones, during route propagation, because of the lack of header loop detection support. Routing tends not to take full advantage of alternate paths, or even non-overlapping pairwise paths (in the case of spanning trees). This document addresses these concerns and suggests applying modern network-layer routing protocols at the link layer. This document assumes that solutions would not address issues of scalability beyond that of existing IEEE 802.1 bridged links, but that a solution would be backward compatible with 802.1, including hubs, bridges, and their existing plug-and-play capabilities. This memo provides information for the Internet community.",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML abstract",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "authors": [
      {
        "name": "Dr. Joseph D. Touch"
      },
      {
        "name": "Radia Perlman"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "docId": "RFC5556",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "docLabel": "IETF RFC 5556",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "docNumber": "5556",
    "docNumber$meta": {
      "confidence": "high",
      "note": "From the RFC index entry (rfc-index.xml <doc-id>)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "docTitle": "Transparent Interconnection of Lots of Links (TRILL): Problem and Applicability Statement",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "docType": "Informational",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "doi": "10.17487/RFC5556",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "href": "https://doi.org/10.17487/RFC5556",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "keywords": [
      "STP"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "Spanning Tree Protocol",
        "Ieee 802.1"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T21:13:28.368Z",
      "version": "extractDocs.js@commit:2d729ed26f61"
    },
    "pages": "17",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "publicationDate": "2009-05-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "references": {
      "bibliographic": [
        "IEEE.STD802.1D.2004",
        "IEEE.STD802.1Q.2006",
        "RFC826",
        "RFC1812",
        "RFC3376",
        "RFC3819",
        "RFC3927",
        "RFC3971",
        "RFC4286",
        "RFC4541",
        "RFC4861",
        "orphan/RFC5556/h:9cbe3f2e",
        "orphan/RFC5556/h:5e0efca8",
        "orphan/RFC5556/h:a5008203",
        "orphan/RFC5556/h:77558fcd",
        "orphan/RFC5556/h:671cb205"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=19 proseBlocks=20 skippedAnchorBlocks=18",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
        "updated": "2026-10-20T17:29:01.451Z",
        "version": "extractDocs.js@commit:8277ba975118"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc5556/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
      "updated": "2026-10-20T17:29:01.451Z",
      "version": "extractDocs.js@commit:8277ba975118"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
        "updated": "2026-10-20T17:29:01.451Z",
        "version": "extractDocs.js@commit:8277ba975118"
      },
      "errataExist": true,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
        "updated": "2026-10-20T17:29:01.451Z",
        "version": "extractDocs.js@commit:8277ba975118"
      },
      "errataUrl": [
        "https://www.rfc-editor.org/errata/rfc5556",
        "https://www.rfc-editor.org/errata_search.php?rfc=5556"
      ],
      "errataUrl$meta": {
        "confidence": "high",
        "note": "Parsed from errata links on RFC/Datatracker pages",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
        "updated": "2026-10-20T17:29:01.451Z",
        "version": "extractDocs.js@commit:8277ba975118"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
        "updated": "2026-10-20T17:29:01.451Z",
        "version": "extractDocs.js@commit:8277ba975118"
      },
      "statusNote": "Informational",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
        "updated": "2026-10-20T17:29:01.451Z",
        "version": "extractDocs.js@commit:8277ba975118"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5556/",
        "updated": "2026-10-20T17:29:01.451Z",
        "version": "extractDocs.js@commit:8277ba975118"
      }
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}