{
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  "docId": "RFC3509",
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    "abstract": "Open Shortest Path First (OSPF) is a link-state intra-domain routing protocol used for routing in IP networks. Though the definition of the Area Border Router (ABR) in the OSPF specification does not require a router with multiple attached areas to have a backbone connection, it is actually necessary to provide successful routing to the inter-area and external destinations. If this requirement is not met, all traffic destined for the areas not connected to such an ABR or out of the OSPF domain, is dropped. This document describes alternative ABR behaviors implemented in Cisco and IBM routers. This memo provides information for the Internet community.",
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    },
    "authors": [
      {
        "name": "Alex D. Zinin"
      },
      {
        "name": "Acee Lindem"
      },
      {
        "name": "Derek M. Yeung"
      }
    ],
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      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
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      "confidence": "high",
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      "originalValue": null,
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    "docLabel": "IETF RFC 3509",
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      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
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    "docNumber": "3509",
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      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "docTitle": "Alternative Implementations of OSPF Area Border Routers",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
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      "confidence": "high",
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      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "doi": "10.17487/RFC3509",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
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    "href": "https://doi.org/10.17487/RFC3509",
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      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
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    "keywords": [
      "Traffic",
      "Backbone"
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    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
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    "pages": "12",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "publicationDate": "2003-04-01",
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      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
    },
    "publisher": "IETF",
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      "confidence": "high",
      "note": "Static: provider",
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      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
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      "bibliographic": [
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        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=1 proseBlocks=3 skippedAnchorBlocks=2",
        "note": "Parsed from RFC HTML references/informative sections",
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        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
        "updated": "2026-10-16T20:41:30.125Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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    "resolvedHref": "https://www.rfc-editor.org/info/rfc3509/",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
      "updated": "2026-10-16T20:41:30.125Z",
      "version": "extractDocs.js@commit:2c3b1db1b97b"
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    "status": {
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
        "updated": "2026-10-16T20:41:30.125Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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        "confidence": "high",
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        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
        "updated": "2026-10-16T20:41:30.125Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
        "updated": "2026-10-16T20:41:30.125Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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      "statusNote": "Informational",
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        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
        "updated": "2026-10-16T20:41:30.125Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3509/",
        "updated": "2026-10-16T20:41:30.125Z",
        "version": "extractDocs.js@commit:2c3b1db1b97b"
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}