.. titel: OSPF LSA Database Analyzer
.. snigel: ospf-lsa-analysator
.. datum: 2026-02-27 00:00:00 UTC
.. taggar: nätverk, ospf, lsa, routing, verktyg
.. kategori:
..länk:
.. beskrivning: OSPF LSA Database Analyzer - analysera visa ip ospf-databasutdata, visualisera områdestopologi, upptäcka inaktuella och anomala LSA:er
.. typ: text
<script src="https://cdnjs.cloudflare.com/ajax/libs/cytoscape/3.26.0/cytoscape.min.js"></script>
<style>
    .calc-container {
        max-width: 1000px;
        margin: 20px auto;
        padding: 20px;
    }

    .calc-header {
        margin-bottom: 30px;
        padding: 25px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border-radius: 12px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        color: white;
    }

    .calc-header h2 {
        margin-top: 0;
        color: white;
        font-size: 28px;
        margin-bottom: 10px;
    }

    .calc-header p {
        margin: 10px 0;
        opacity: 0.95;
        font-size: 15px;
    }

    .input-group {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 15px;
        margin-top: 20px;
    }

    .input-field {
        display: flex;
        flex-direction: column;
    }

    .input-field label {
        margin-bottom: 8px;
        font-weight: bold;
        color: white;
        font-size: 14px;
    }

    .input-field input,
    .input-field select,
    .input-field textarea {
        padding: 14px;
        font-size: 14px;
        border: 2px solid rgba(255,255,255,0.3);
        border-radius: 6px;
        background: rgba(255,255,255,0.95);
        transition: all 0.3s ease;
        color: #333;
    }

    .input-field input:focus,
    .input-field select:focus,
    .input-field textarea:focus {
        outline: none;
        border-color: #4CAF50;
        background: white;
        box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
    }

    .cli-textarea {
        font-family: 'Courier New', 'Lucida Console', monospace;
        font-size: 12px;
        resize: vertical;
        min-height: 160px;
    }

    .vendor-select {
        font-size: 14px;
        cursor: pointer;
    }

    .button-group {
        margin-top: 20px;
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
    }

    .submit-btn {
        padding: 14px 35px;
        font-size: 16px;
        background: #4CAF50;
        color: white;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        font-weight: bold;
        transition: all 0.3s ease;
        box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    }

    .submit-btn:hover {
        background: #45a049;
        transform: translateY(-1px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    }

    .submit-btn:active {
        background: #3d8b40;
        transform: translateY(0);
    }

    .result-section {
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
        margin-bottom: 15px;
        overflow: hidden;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        transition: all 0.3s ease;
    }

    .result-section:hover {
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

    .section-header {
        background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
        color: white;
        padding: 15px 20px;
        font-size: 18px;
        font-weight: bold;
    }

    .section-content {
        padding: 20px;
        background: #fafafa;
    }

    .data-row {
        display: flex;
        margin: 12px 0;
        padding: 10px;
        background: white;
        border-radius: 4px;
        border-left: 3px solid #4CAF50;
    }

    .data-label {
        font-weight: bold;
        color: #555;
        min-width: 180px;
        flex-shrink: 0;
    }

    .data-value {
        color: #333;
        font-family: 'Courier New', monospace;
        word-break: break-word;
    }

    .data-value.highlight {
        color: #4CAF50;
        font-weight: bold;
        font-size: 18px;
    }

    .help-text {
        margin-top: 15px;
        font-size: 13px;
        color: rgba(255,255,255,0.9);
        background: rgba(0,0,0,0.15);
        padding: 10px 15px;
        border-radius: 4px;
        line-height: 1.6;
    }

    .help-text strong {
        color: white;
    }

    /* LSA Bar Chart */
    .lsa-bar-row {
        display: flex;
        align-items: center;
        margin: 8px 0;
        gap: 10px;
    }

    .lsa-type-label {
        min-width: 200px;
        font-size: 13px;
        color: #555;
        font-weight: bold;
        flex-shrink: 0;
    }

    .lsa-bar-track {
        flex: 1;
        background: #e8e8e8;
        border-radius: 4px;
        height: 22px;
        overflow: hidden;
    }

    .lsa-bar-fill {
        height: 100%;
        border-radius: 4px;
        transition: width 0.6s ease;
        min-width: 2px;
    }

    .lsa-count-badge {
        min-width: 36px;
        text-align: right;
        font-weight: bold;
        color: #333;
        font-size: 14px;
    }

    /* Table styles */
    table tr:hover td {
        background: #f5f9ff !important;
    }

    th[data-col] {
        user-select: none;
    }

    th[data-col]:hover {
        background: #e8e8e8 !important;
    }

    th .sort-arrow {
        color: #aaa;
        font-size: 11px;
    }

    .filter-bar select,
    .filter-bar input[type="checkbox"] {
        cursor: pointer;
    }

    /* Alert badges */
    .alert-badge {
        display: inline-block;
        padding: 4px 12px;
        border-radius: 12px;
        font-size: 13px;
        font-weight: bold;
        color: white;
    }

    /* Graph legend */
    .legend-dot {
        display: inline-block;
        width: 14px;
        height: 14px;
        border-radius: 3px;
        vertical-align: middle;
        margin-right: 4px;
    }

    /* Responsive */
    @media (max-width: 768px) {
        .input-group {
            grid-template-columns: 1fr;
        }

        .lsa-type-label {
            min-width: 130px;
            font-size: 11px;
        }

        #ospf-graph {
            height: 280px !important;
        }

        .data-row {
            flex-direction: column;
        }

        .data-label {
            margin-bottom: 5px;
            min-width: auto;
        }

        .section-header {
            font-size: 15px;
        }
    }

    @media (max-width: 480px) {
        .calc-header h2 {
            font-size: 20px;
        }

        #ospf-graph {
            height: 220px !important;
        }

        .lsa-type-label {
            min-width: 100px;
            font-size: 10px;
        }

        .submit-btn {
            padding: 12px 20px;
            font-size: 14px;
        }
    }
</style>
<div class="calc-container">
Lila rubrik med ingångar
<div class="calc-header">
<h2>OSPF LSA Database Analyzer</h2>
<p>Klistra<code style="background:rgba(255,255,255,0.2);padding:2px 6px;border-radius:3px;">show ip ospf database</code>utdata för att visualisera områdestopologi, upptäcka inaktuella LSA:er och analysera ditt OSPF-nätverk.</p>
<div class="input-group">
<div class="input-field">
<label for="vendor-select">Försäljare</label>
<select class="vendor-select" id="vendor-select">
<option value="auto">Automatisk upptäckt</option>
<option value="cisco-ios">Cisco IOS / NX-OS</option>
<option value="juniper">Juniper JunOS</option>
<option value="aruba-aos-cx">Aruba AOS-CX</option>
<option value="sonic">Broadcom SONiC (FRR)</option>
<option value="extreme-exos">Extreme ExtremeXOS</option>
</select>
</div>
</div>
<div class="input-field" style="margin-top:12px;">
<label for="cli-textarea">CLI-utgång</label>
<textarea class="cli-textarea" id="cli-textarea" placeholder="Paste show ip ospf database output here...

Example: Cisco IOS
  show ip ospf database

Juniper:
  show ospf database

SONiC (vtysh):
  show ip ospf database" rows="10"></textarea>
</div>
<div class="button-group">
<button class="submit-btn" onclick="analyzeOSPF()" type="button">Analysera</button>
<button class="submit-btn" onclick="loadExample()" style="background:#607d8b;" type="button">Ladda exempel</button>
</div>
<div class="help-text">
<strong>Kommandon:</strong>Cisco IOS/NX-OS:<code style="background:rgba(255,255,255,0.15);padding:1px 5px;border-radius:3px;">show ip ospf database</code>| 
            Juniper:<code style="background:rgba(255,255,255,0.15);padding:1px 5px;border-radius:3px;">show ospf database</code>| 
            Aruba AOS-CX:<code style="background:rgba(255,255,255,0.15);padding:1px 5px;border-radius:3px;">show ip ospf database</code>| 
            SONiC (vtysh):<code style="background:rgba(255,255,255,0.15);padding:1px 5px;border-radius:3px;">show ip ospf database</code><br/>Valfri detalj: bifoga<code style="background:rgba(255,255,255,0.15);padding:1px 5px;border-radius:3px;">summary</code>, <code style="background:rgba(255,255,255,0.15);padding:1px 5px;border-radius:3px;">external</code>, eller<code style="background:rgba(255,255,255,0.15);padding:1px 5px;border-radius:3px;">router</code>för att filtrera efter LSA-typ.
            SONiC/FRR-utgången är identisk med Cisco IOS-format.</div>
</div>
Resultatområde (dold tills du klickar på Analysera)
<div id="results-area" style="display:none;">
Avsnitt 1: LSA-typfördelning
<div class="result-section">
<div class="section-header">LSA-typfördelning<span style="float:right;font-size:13px;font-weight:normal;opacity:0.9;">Router-ID:<strong id="router-id-display">—</strong>| 
                    Behandla:<strong id="process-id-display">—</strong>| 
                    Total:<strong id="total-lsa-count">0</strong>LSAs
                     | 
                    Områden:<strong id="area-count">0</strong>
</span>
</div>
<div class="section-content">
<div id="lsa-breakdown"></div>
<div style="margin-top:14px;display:flex;gap:10px;flex-wrap:wrap;align-items:center;">
<span id="stale-badge" style="display:none;background:#f39c12;color:white;padding:4px 12px;border-radius:12px;font-size:13px;font-weight:bold;">⚠ Inaktuella LSA:er:<span id="stale-count">0</span>
</span>
<span id="maxage-badge" style="display:none;background:#e74c3c;color:white;padding:4px 12px;border-radius:12px;font-size:13px;font-weight:bold;">✗ MaxAge LSA:er:<span id="maxage-count">0</span>
</span>
<span style="background:#3498db;color:white;padding:4px 12px;border-radius:12px;font-size:13px;font-weight:bold;">Externa LSA:er:<span id="ext-count">0</span>
</span>
</div>
</div>
</div>
Avsnitt 2: Areatopologidiagram
<div class="result-section">
<div class="section-header">Områdestopologi<span id="graph-badge" style="font-size:12px;font-weight:normal;opacity:0.85;margin-left:10px;"></span>
</div>
<div class="section-content" style="padding:15px;">
<div id="ospf-graph" style="width:100%;height:420px;border:1px solid #e0e0e0;border-radius:4px;background:#fafafa;"></div>
<div style="margin-top:12px;display:flex;gap:18px;flex-wrap:wrap;font-size:12px;color:#555;align-items:center;">
<span><span class="legend-dot" style="background:#2ecc71;"></span>Område 0 (ryggrad)</span>
<span><span class="legend-dot" style="background:#3498db;"></span>Område utan ryggrad</span>
<span><span class="legend-dot" style="background:#ecf0f1;border:1px solid #bdc3c7;"></span>Router</span>
<span><span class="legend-dot" style="background:#f39c12;"></span>ABR</span>
<span><span class="legend-dot" style="background:#e74c3c;"></span>ASBR</span>
<span><span class="legend-dot" style="background:#95a5a6;"></span>Externa rutter</span>
</div>
</div>
</div>
Avsnitt 3: Anomalifynd
<div class="result-section">
<div class="section-header">Anomalifynd<span id="anomaly-header-badge" style="font-size:12px;font-weight:normal;opacity:0.85;margin-left:10px;"></span>
</div>
<div class="section-content">
<div id="anomaly-list"></div>
</div>
</div>
Avsnitt 4: LSA-tabell
<div class="result-section">
<div class="section-header">LSA-databas</div>
<div class="section-content">
Filterstapel
<div class="filter-bar" style="display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:12px;padding:10px 12px;background:white;border-radius:4px;border:1px solid #e0e0e0;">
<label style="font-weight:bold;font-size:13px;color:#555;">Område:</label>
<select id="area-filter" onchange="currentAreaFilter=this.value;if(currentDB)renderLSATable(currentDB);" style="padding:6px 10px;border:1px solid #ddd;border-radius:4px;font-size:13px;"></select>
<label style="font-weight:bold;font-size:13px;color:#555;margin-left:10px;">Typer:</label>
<label style="font-size:12px;color:#555;"><input checked="" onchange="toggleTypeFilter(1,this.checked)" type="checkbox"/>T1-router</label>
<label style="font-size:12px;color:#555;"><input checked="" onchange="toggleTypeFilter(2,this.checked)" type="checkbox"/>T2-Net</label>
<label style="font-size:12px;color:#555;"><input checked="" onchange="toggleTypeFilter(3,this.checked)" type="checkbox"/>T3-summa</label>
<label style="font-size:12px;color:#555;"><input checked="" onchange="toggleTypeFilter(4,this.checked)" type="checkbox"/>T4-ASBR</label>
<label style="font-size:12px;color:#555;"><input checked="" onchange="toggleTypeFilter(5,this.checked)" type="checkbox"/>T5-Ext</label>
<label style="font-size:12px;color:#555;"><input checked="" onchange="toggleTypeFilter(7,this.checked)" type="checkbox"/>T7-NSSA</label>
</div>
<div style="overflow-x:auto;">
<table style="width:100%;border-collapse:collapse;font-size:13px;">
<thead>
<tr style="background:#f5f5f5;border-bottom:2px solid #ddd;">
<th data-col="type" onclick="setSortCol('type')" style="padding:8px 10px;text-align:left;cursor:pointer;white-space:nowrap;">Typ<span class="sort-arrow"> ↕</span></th>
<th data-col="linkId" onclick="setSortCol('linkId')" style="padding:8px 10px;text-align:left;cursor:pointer;">LSID<span class="sort-arrow"> ↕</span></th>
<th data-col="advRouter" onclick="setSortCol('advRouter')" style="padding:8px 10px;text-align:left;cursor:pointer;">ADV router<span class="sort-arrow"> ↕</span></th>
<th data-col="age" onclick="setSortCol('age')" style="padding:8px 10px;text-align:right;cursor:pointer;">Åldras<span class="sort-arrow"> ↓</span></th>
<th style="padding:8px 10px;text-align:left;">Seq#</th>
<th style="padding:8px 10px;text-align:left;">Kontrollsumma</th>
<th style="padding:8px 10px;text-align:center;">Länkar</th>
<th style="padding:8px 10px;text-align:left;">Status</th>
</tr>
</thead>
<tbody id="lsa-table-body">
<tr>
<td colspan="8" style="text-align:center;padding:20px;color:#888;">Klistra in CLI-utdata och klicka på Analysera.</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>slutresultat-området
</div>slutkalk-behållare
<script>
'use strict';

/* =========================================================
   STATE
   ========================================================= */
let currentDB   = null;
let cyInstance  = null;
let currentSort = { col: 'age', dir: 'desc' };
let currentAreaFilter = 'all';
let currentTypeFilter = new Set([1, 2, 3, 4, 5, 7, 9, 10, 11]);

/* =========================================================
   UTILITY
   ========================================================= */
/**
 * Escape HTML entities to prevent XSS.
 * @param {*} s - value to escape
 * @returns {string}
 */
function escHtml(s) {
    if (s === null || s === undefined) return '';
    return String(s)
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;');
}

/* =========================================================
   VENDOR AUTO-DETECTION
   ========================================================= */
/**
 * Detect OSPF output vendor from raw CLI text.
 * @param {string} raw
 * @returns {string} vendor key
 */
function detectOSPFVendor(raw) {
    if (/OSPF database,\s+Area/i.test(raw)) return 'juniper';
    if (/OSPF Router with ID[\s\S]*?VRF/i.test(raw)) return 'aruba-aos-cx';
    if (/OSPF Router with ID/i.test(raw)) return 'cisco-ios';
    // Fallback: try cisco-ios parser (FRR/SONiC identical format)
    return 'cisco-ios';
}

/* =========================================================
   CISCO IOS / NX-OS / ARUBA AOS-CX / BROADCOM SONIC PARSER
   ========================================================= */
/**
 * Parse Cisco IOS, NX-OS, Aruba AOS-CX, and SONiC (FRR) OSPF database output.
 * All four vendors produce near-identical show ip ospf database output.
 *
 * @param {string} raw - raw CLI output
 * @returns {object} parsed database object
 */
function parseCiscoOSPFDatabase(raw) {
    const result = {
        vendor: 'cisco-ios',
        routerId: null,
        processId: null,
        areas: {},
        lsas: [],
    };

    // Parse header: "OSPF Router with ID (1.1.1.1) (Process ID 1)"
    const headerM = raw.match(/OSPF Router with ID\s*\(?([\d.]+)\)?\s*\(?Process ID\s+(\d+)\)?/i);
    if (headerM) {
        result.routerId  = headerM[1];
        result.processId = parseInt(headerM[2], 10);
    }

    // Aruba AOS-CX header variant: "(Process 1) VRF default"
    if (!result.processId) {
        const arubaM = raw.match(/OSPF Router with ID\s*\(?([\d.]+)\)?\s*\(?Process\s+(\d+)\)?/i);
        if (arubaM) {
            result.routerId  = arubaM[1];
            result.processId = parseInt(arubaM[2], 10);
        }
    }

    // FRR/SONiC header: "OSPF Router with ID (1.1.1.1)"
    if (!result.routerId) {
        const frrM = raw.match(/OSPF Router with ID\s*\(?([\d.]+)\)?/i);
        if (frrM) result.routerId = frrM[1];
    }

    const LSA_SECTION_MAP = {
        'router link states':             1,
        'net link states':                2,
        'summary net link states':        3,
        'summary asb link states':        4,
        'type-5 as external link states': 5,
        'type-7 as external link states': 7,
        'type-9 opaque link states':      9,
        'type-10 opaque link states':     10,
        'type-11 opaque link states':     11,
    };

    const lines = raw.split('\n');
    let currentType = null;
    let currentArea = '__domain__';
    let headerPassed = false;

    for (const line of lines) {
        const trimmedLower = line.trim().toLowerCase();

        // Check for LSA section header
        let sectionMatched = false;
        for (const [pattern, typeNum] of Object.entries(LSA_SECTION_MAP)) {
            if (trimmedLower.includes(pattern)) {
                currentType = typeNum;
                const areaM = line.match(/\(Area\s+([\d.]+)\)/i);
                currentArea  = areaM ? areaM[1] : '__domain__';
                headerPassed = false;
                if (!result.areas[currentArea]) result.areas[currentArea] = { lsas: [] };
                sectionMatched = true;
                break;
            }
        }
        if (sectionMatched) continue;

        // Column header row signals that data rows follow
        if (/Link ID\s+ADV Router\s+Age/i.test(line)) {
            headerPassed = true;
            continue;
        }
        if (!headerPassed || currentType === null) continue;

        // LSA data row: LinkID  AdvRouter  Age  Seq#  Checksum  [LinkCount/Tag]
        const lsaM = line.match(
            /^\s*([\d.]+)\s+([\d.]+)\s+(\d+)\s+(0x[0-9a-fA-F]+)\s+(0x[0-9a-fA-F]+)(?:\s+(\d+))?/
        );
        if (lsaM) {
            const age = parseInt(lsaM[3], 10);
            const lsa = {
                type:      currentType,
                area:      currentArea,
                linkId:    lsaM[1],
                advRouter: lsaM[2],
                age,
                seqNum:    lsaM[4],
                checksum:  lsaM[5],
                linkCount: lsaM[6] !== undefined ? parseInt(lsaM[6], 10) : null,
                isStale:   age > 1700 && age < 3600,
                isMaxAge:  age >= 3600,
            };
            result.lsas.push(lsa);
            if (!result.areas[currentArea]) result.areas[currentArea] = { lsas: [] };
            result.areas[currentArea].lsas.push(lsa);
        }
    }

    return result;
}

/* =========================================================
   JUNIPER JUNOS PARSER
   ========================================================= */
/**
 * Parse Juniper JunOS OSPF database output (show ospf database).
 *
 * @param {string} raw - raw CLI output
 * @returns {object} parsed database object
 */
function parseJuniperOSPFDatabase(raw) {
    const result = {
        vendor: 'juniper',
        routerId: null,
        processId: null,
        areas: {},
        lsas: [],
    };

    const JUNIPER_TYPE_MAP = {
        router:  1,
        network: 2,
        summary: 3,
        asbrsum: 4,
        extern:  5,
        nssa:    7,
        opaque:  9,
    };

    const lines = raw.split('\n');
    let currentArea = null;

    for (const line of lines) {
        // Area section header: "    OSPF database, Area 0.0.0.0"
        const areaM = line.match(/OSPF database,\s+Area\s+([\d.]+)/i);
        if (areaM) {
            currentArea = areaM[1];
            if (!result.areas[currentArea]) result.areas[currentArea] = { lsas: [] };
            continue;
        }

        // Skip the column header row
        if (/^\s*Type\s+ID\s+Adv Rtr/i.test(line)) continue;
        if (!currentArea) continue;

        // LSA data row: Type  LSID  AdvRouter  Seq  Age  [Opt  Cksum  Len]
        const lsaM = line.match(
            /^\s*(Router|Network|Summary|ASBRSum|Extern|NSSA|Opaque)\s+([\d.]+)\s+([\d.]+)\s+(0x[0-9a-fA-F]+)\s+(\d+)/i
        );
        if (lsaM) {
            const age     = parseInt(lsaM[5], 10);
            const typeKey = lsaM[1].toLowerCase();
            const lsa = {
                type:      JUNIPER_TYPE_MAP[typeKey] || 0,
                area:      currentArea,
                linkId:    lsaM[2],
                advRouter: lsaM[3],
                seqNum:    lsaM[4],
                age,
                checksum:  null,
                linkCount: null,
                isStale:   age > 1700 && age < 3600,
                isMaxAge:  age >= 3600,
            };
            result.lsas.push(lsa);
            result.areas[currentArea].lsas.push(lsa);
        }
    }
    return result;
}

/* =========================================================
   MASTER PARSE FUNCTION
   ========================================================= */
/**
 * Parse OSPF database output using the appropriate vendor parser.
 *
 * @param {string} vendor - vendor key or 'auto'
 * @param {string} raw    - raw CLI output text
 * @returns {object} parsed database object
 */
function parseOSPFInput(vendor, raw) {
    const detected = (vendor === 'auto') ? detectOSPFVendor(raw) : vendor;
    let db;
    switch (detected) {
        case 'juniper':
            db = parseJuniperOSPFDatabase(raw);
            break;
        // cisco-ios, aruba-aos-cx, sonic all use the same FRR/IOS format
        default:
            db = parseCiscoOSPFDatabase(raw);
            db.vendor = detected;
            break;
    }
    db.detectedVendor = detected;
    return db;
}

/* =========================================================
   ANALYSIS ENGINE — ROUTER ROLE IDENTIFICATION
   ========================================================= */
/**
 * Identify ABRs (Area Border Routers) and ASBRs (AS Boundary Routers)
 * from the parsed LSA database and attach topology metadata to db.
 *
 * ABR: originates Type-1 LSAs in more than one area.
 * ASBR: appears as Link ID in any Type-4, or originates any Type-5/7.
 *
 * @param {object} db - parsed database object (mutated in-place)
 */
function identifyRouterRoles(db) {
    // Map each router ID to the set of areas it appears in (via Type-1 LSAs)
    const routerAreaMap = {};
    db.lsas.filter(l => l.type === 1).forEach(l => {
        if (!routerAreaMap[l.advRouter]) routerAreaMap[l.advRouter] = new Set();
        routerAreaMap[l.advRouter].add(l.area);
    });

    // Also pick up any router that appears in a non-Type-1 LSA but not in Type-1
    // (e.g. partial database paste with only external LSAs)
    db.lsas.forEach(l => {
        if (!routerAreaMap[l.advRouter]) {
            routerAreaMap[l.advRouter] = new Set([l.area]);
        }
    });

    // ASBR: referenced in Type-4 Link IDs, or originates Type-5/7
    const asbrIds = new Set([
        ...db.lsas.filter(l => l.type === 4).map(l => l.linkId),
        ...db.lsas.filter(l => l.type === 5 || l.type === 7).map(l => l.advRouter),
    ]);

    db.topology = {
        routers: Object.entries(routerAreaMap).map(([routerId, areas]) => ({
            routerId,
            areas:   [...areas],
            isABR:   areas.size > 1,
            isASBR:  asbrIds.has(routerId),
        })),
        hasExternal: db.lsas.some(l => l.type === 5),
        hasNSSA:     db.lsas.some(l => l.type === 7),
    };
}

/* =========================================================
   ANALYSIS ENGINE — ANOMALY DETECTION
   ========================================================= */
/**
 * Detect anomalies in the OSPF LSA database including stale/MaxAge LSAs,
 * duplicate advertising, excessive external routes, and missing backbone.
 *
 * @param {object} db - parsed and role-identified database object
 * @returns {Array<{level:string, code:string, message:string}>}
 */
function detectAnomalies(db) {
    const anomalies  = [];
    const MAX_AGE    = 3600;

    // --- MaxAge LSAs (age >= 3600) ---
    db.lsas.filter(l => l.isMaxAge).forEach(l => {
        anomalies.push({
            level:   'error',
            code:    'MAXAGE_LSA',
            message: `Type-${l.type} LSA: LSID=${l.linkId}, ADV=${l.advRouter}, age=${l.age}s has reached MaxAge (${MAX_AGE}s). ` +
                     `The originating router may be down or the adjacency has been lost.`,
        });
    });

    // --- Stale LSAs (age > 1700, approaching LSRefreshTime of 1800s) ---
    db.lsas.filter(l => l.isStale).forEach(l => {
        anomalies.push({
            level:   'warning',
            code:    'STALE_LSA',
            message: `Type-${l.type} LSA: LSID=${l.linkId}, ADV=${l.advRouter}, age=${l.age}s is approaching MaxAge. ` +
                     `The originating router should re-originate this LSA soon (LSRefreshTime=1800s).`,
        });
    });

    // --- Duplicate LSA detection: same Type+LSID+Area advertised by multiple routers ---
    const lsaIndex = {};
    db.lsas.forEach(l => {
        const key = `${l.type}|${l.linkId}|${l.area}`;
        if (!lsaIndex[key]) lsaIndex[key] = [];
        lsaIndex[key].push(l);
    });
    Object.values(lsaIndex).forEach(list => {
        if (list.length < 2) return;
        const advRouters = [...new Set(list.map(l => l.advRouter))];
        // Type-1 (Router LSAs) are always unique per originator — skip
        if (advRouters.length > 1 && list[0].type !== 1) {
            anomalies.push({
                level:   'warning',
                code:    'DUPLICATE_LSA',
                message: `Type-${list[0].type} LSA LSID=${list[0].linkId} in area ${list[0].area} ` +
                         `is advertised by multiple routers: ${advRouters.join(', ')}. ` +
                         `This may indicate a database synchronisation issue.`,
            });
        }
    });

    // --- Excessive external LSAs (potential redistribution storm) ---
    const extCount = db.lsas.filter(l => l.type === 5 || l.type === 7).length;
    if (extCount > 500) {
        anomalies.push({
            level:   'warning',
            code:    'EXCESSIVE_EXTERNAL',
            message: `${extCount} Type-5/7 LSAs detected. This may indicate a redistribution storm ` +
                     `or a full BGP table being leaked into OSPF. Verify ASBR redistribution policy ` +
                     `and consider using a route-map to filter redistributed prefixes.`,
        });
    }

    // --- No backbone area (area 0) in a multi-area domain ---
    const areaKeys   = Object.keys(db.areas).filter(a => a !== '__domain__');
    const hasBackbone = areaKeys.some(a => a === '0.0.0.0' || a === '0');
    if (areaKeys.length > 1 && !hasBackbone) {
        anomalies.push({
            level:   'error',
            code:    'NO_BACKBONE_AREA',
            message: `No Area 0 LSAs found but multiple areas detected (${areaKeys.join(', ')}). ` +
                     `All OSPF areas must connect to the backbone (Area 0) per RFC 2328 Section 3.2.`,
        });
    }

    // --- ASBR in single area with no Type-4 reachability ---
    if (db.topology) {
        const type4LinkIds = new Set(db.lsas.filter(l => l.type === 4).map(l => l.linkId));
        const type5Originators = [...new Set(db.lsas.filter(l => l.type === 5).map(l => l.advRouter))];
        type5Originators.forEach(asbr => {
            const routerInfo = db.topology.routers.find(r => r.routerId === asbr);
            const isSingleArea = routerInfo && routerInfo.areas.length === 1;
            if (!type4LinkIds.has(asbr) && isSingleArea) {
                anomalies.push({
                    level:   'info',
                    code:    'ASBR_SINGLE_AREA',
                    message: `ASBR ${asbr} originates Type-5 External LSAs but has no corresponding ` +
                             `Type-4 ASBR Summary LSA. This ASBR is reachable only from its own area. ` +
                             `This is expected if you pasted only a partial database output.`,
                });
            }
        });
    }

    // --- Single router detected (no adjacencies or partial paste) ---
    const uniqueRouters = new Set(db.lsas.filter(l => l.type === 1).map(l => l.advRouter));
    if (uniqueRouters.size === 1) {
        anomalies.push({
            level:   'info',
            code:    'SINGLE_ROUTER',
            message: `Only one router (${[...uniqueRouters][0]}) found in the Type-1 LSA database. ` +
                     `No OSPF adjacencies have been formed, or only a partial database output was pasted. ` +
                     `Run 'show ip ospf neighbor' to verify adjacency state.`,
        });
    }

    // --- Empty database ---
    if (db.lsas.length === 0) {
        anomalies.push({
            level:   'error',
            code:    'EMPTY_DATABASE',
            message: `No LSAs could be parsed from the input. Verify the pasted output is from ` +
                     `'show ip ospf database' (or equivalent) and that the correct vendor is selected.`,
        });
    }

    return anomalies;
}

/* =========================================================
   CYTOSCAPE.JS AREA TOPOLOGY GRAPH
   ========================================================= */
/**
 * Build and render the Cytoscape.js area topology graph.
 * Shows areas, routers, ABRs, ASBRs, and external cloud node.
 *
 * @param {object} db - fully parsed and analysed database object
 */
function buildAreaGraph(db) {
    if (cyInstance) {
        cyInstance.destroy();
        cyInstance = null;
    }

    const nodes = [];
    const edges = [];
    const realAreas = Object.keys(db.areas).filter(a => a !== '__domain__');

    // Area nodes
    realAreas.forEach(area => {
        const isBackbone = area === '0.0.0.0' || area === '0';
        const lsaCount   = db.areas[area].lsas.length;
        const areaLabel  = isBackbone
            ? `Area 0\n(Backbone)\n${lsaCount} LSAs`
            : `Area ${area}\n${lsaCount} LSAs`;
        nodes.push({ data: {
            id:       `area_${area}`,
            label:    areaLabel,
            type:     isBackbone ? 'backbone' : 'area',
            lsaCount,
        }});
    });

    // Domain-wide bucket for Type-5 LSAs (no specific area)
    // These are already handled via external cloud node below

    // Router nodes and membership edges
    (db.topology?.routers || []).forEach(router => {
        const roleSuffix = [
            router.isABR  ? '[ABR]'  : '',
            router.isASBR ? '[ASBR]' : '',
        ].filter(Boolean).join(' ');
        const label = roleSuffix ? `${router.routerId}\n${roleSuffix}` : router.routerId;

        const nodeType = router.isABR
            ? 'abr'
            : router.isASBR
                ? 'asbr'
                : 'router';

        nodes.push({ data: {
            id:       `rtr_${router.routerId}`,
            label,
            type:     nodeType,
            routerId: router.routerId,
        }});

        // Connect router to each area it appears in
        router.areas.forEach(area => {
            if (area === '__domain__') return;
            if (db.areas[area]) {
                edges.push({ data: {
                    id:     `e_rtr_${router.routerId}_${area}`,
                    source: `rtr_${router.routerId}`,
                    target: `area_${area}`,
                    type:   'membership',
                }});
            }
        });
    });

    // External cloud node — shown if any Type-5/7 LSAs exist
    if (db.topology?.hasExternal || db.topology?.hasNSSA) {
        nodes.push({ data: {
            id:    'ext_cloud',
            label: 'External\nRoutes',
            type:  'external',
        }});

        (db.topology.routers || []).filter(r => r.isASBR).forEach(r => {
            edges.push({ data: {
                id:     `e_asbr_${r.routerId}_ext`,
                source: `rtr_${r.routerId}`,
                target: 'ext_cloud',
                type:   'redistribution',
            }});
        });
    }

    // Guard: filter edges that reference non-existent nodes
    const nodeIds   = new Set(nodes.map(n => n.data.id));
    const validEdges = edges.filter(e =>
        nodeIds.has(e.data.source) && nodeIds.has(e.data.target)
    );

    if (nodes.length === 0) {
        document.getElementById('ospf-graph').innerHTML =
            '<div style="display:flex;align-items:center;justify-content:center;height:100%;color:#aaa;font-size:14px;">No topology data to display.</div>';
        return;
    }

    cyInstance = cytoscape({
        container: document.getElementById('ospf-graph'),
        elements:  { nodes, edges: validEdges },
        style: [
            {
                selector: 'node',
                style: {
                    'label':         'data(label)',
                    'text-wrap':     'wrap',
                    'text-max-width':'110px',
                    'font-size':     '11px',
                    'text-valign':   'center',
                    'text-halign':   'center',
                    'border-width':  2,
                    'border-color':  '#ccc',
                    'width':         '100px',
                    'height':        '70px',
                },
            },
            {
                selector: 'node[type="backbone"]',
                style: {
                    'background-color': '#2ecc71',
                    'border-color':     '#27ae60',
                    'border-width':     3,
                    'color':            '#fff',
                    'font-weight':      'bold',
                    'shape':            'hexagon',
                    'width':            '130px',
                    'height':           '130px',
                    'font-size':        '12px',
                },
            },
            {
                selector: 'node[type="area"]',
                style: {
                    'background-color': '#3498db',
                    'color':            '#fff',
                    'shape':            'roundrectangle',
                    'width':            '110px',
                    'height':           '65px',
                    'font-size':        '11px',
                },
            },
            {
                selector: 'node[type="router"]',
                style: {
                    'background-color': '#ecf0f1',
                    'color':            '#2c3e50',
                    'border-color':     '#bdc3c7',
                    'shape':            'roundrectangle',
                    'width':            '100px',
                    'height':           '50px',
                    'font-size':        '10px',
                },
            },
            {
                selector: 'node[type="abr"]',
                style: {
                    'background-color': '#f39c12',
                    'color':            '#fff',
                    'font-weight':      'bold',
                    'shape':            'diamond',
                    'width':            '120px',
                    'height':           '90px',
                    'font-size':        '11px',
                },
            },
            {
                selector: 'node[type="asbr"]',
                style: {
                    'background-color': '#e74c3c',
                    'color':            '#fff',
                    'font-weight':      'bold',
                    'shape':            'diamond',
                    'width':            '120px',
                    'height':           '90px',
                    'font-size':        '11px',
                },
            },
            {
                selector: 'node[type="external"]',
                style: {
                    'background-color': '#95a5a6',
                    'color':            '#fff',
                    'shape':            'ellipse',
                    'width':            '90px',
                    'height':           '60px',
                    'font-style':       'italic',
                    'font-size':        '11px',
                },
            },
            {
                selector: 'edge',
                style: {
                    'width':               2,
                    'line-color':          '#bdc3c7',
                    'target-arrow-color':  '#bdc3c7',
                    'target-arrow-shape': 'triangle',
                    'arrow-scale':         0.7,
                    'curve-style':        'bezier',
                },
            },
            {
                selector: 'edge[type="membership"]',
                style: {
                    'line-color':           '#95a5a6',
                    'target-arrow-shape':  'none',
                    'line-style':          'solid',
                },
            },
            {
                selector: 'edge[type="redistribution"]',
                style: {
                    'line-color':           '#e74c3c',
                    'target-arrow-color':   '#e74c3c',
                    'line-style':          'dashed',
                    'target-arrow-shape':  'triangle',
                },
            },
        ],
        layout: {
            name:           'cose',
            padding:         30,
            nodeRepulsion:   8000,
            idealEdgeLength: 100,
            animate:         false,
            randomize:       false,
        },
    });

    cyInstance.fit(undefined, 20);
}

/* =========================================================
   LSA BREAKDOWN BAR CHART RENDERER
   ========================================================= */
/**
 * Render the horizontal CSS bar chart showing LSA type distribution
 * and update the summary stats row (Router ID, Process ID, totals).
 *
 * @param {object} db - parsed database object
 */
function renderLSABreakdown(db) {
    const container = document.getElementById('lsa-breakdown');
    if (!container) return;

    const totalLSAs = db.lsas.length;

    const TYPE_INFO = [
        { type: 1,  name: 'Type 1 — Router LSA',     color: '#4CAF50' },
        { type: 2,  name: 'Type 2 — Network LSA',    color: '#2196F3' },
        { type: 3,  name: 'Type 3 — Summary LSA',    color: '#9C27B0' },
        { type: 4,  name: 'Type 4 — ASBR Summary',   color: '#FF9800' },
        { type: 5,  name: 'Type 5 — External LSA',   color: '#F44336' },
        { type: 7,  name: 'Type 7 — NSSA External',  color: '#E91E63' },
        { type: 9,  name: 'Type 9/10/11 — Opaque',   color: '#607D8B' },
    ];

    // Bucket counts — opaque types 9/10/11 all go into key=9
    const counts = {};
    db.lsas.forEach(l => {
        const key = l.type >= 9 ? 9 : l.type;
        counts[key] = (counts[key] || 0) + 1;
    });

    const maxCount = Math.max(...Object.values(counts), 1);

    // Always show Type-1 and Type-5 rows; skip others with count=0
    container.innerHTML = TYPE_INFO
        .filter(t => (counts[t.type] || 0) > 0 || t.type === 1 || t.type === 5)
        .map(t => {
            const count = counts[t.type] || 0;
            const pct   = Math.round((count / maxCount) * 100);
            return `
            <div class="lsa-bar-row">
                <div class="lsa-type-label">${escHtml(t.name)}</div>
                <div class="lsa-bar-track">
                    <div class="lsa-bar-fill" style="width:${pct}%;background:${t.color};"></div>
                </div>
                <div class="lsa-count-badge" style="color:${count > 0 ? '#333' : '#aaa'};">${count}</div>
            </div>`;
        }).join('');

    // Update summary stats
    document.getElementById('router-id-display').textContent  = db.routerId  || '—';
    document.getElementById('process-id-display').textContent = db.processId || '—';
    document.getElementById('total-lsa-count').textContent    = totalLSAs;
    document.getElementById('area-count').textContent         = Object.keys(db.areas).filter(a => a !== '__domain__').length;

    // Alert badges
    const staleCount  = db.lsas.filter(l => l.isStale).length;
    const maxAgeCount = db.lsas.filter(l => l.isMaxAge).length;
    const extCount    = db.lsas.filter(l => l.type === 5 || l.type === 7).length;

    document.getElementById('stale-count').textContent  = staleCount;
    document.getElementById('maxage-count').textContent = maxAgeCount;
    document.getElementById('ext-count').textContent    = extCount;

    document.getElementById('stale-badge').style.display  = staleCount  > 0 ? 'inline-block' : 'none';
    document.getElementById('maxage-badge').style.display = maxAgeCount > 0 ? 'inline-block' : 'none';
}

/* =========================================================
   ANOMALY PANEL RENDERER
   ========================================================= */
/**
 * Render the anomaly findings panel with colour-coded severity badges.
 *
 * @param {Array} anomalies - array of anomaly objects {level, code, message}
 */
function renderAnomalies(anomalies) {
    const container = document.getElementById('anomaly-list');
    const headerBadge = document.getElementById('anomaly-header-badge');

    const errCount  = anomalies.filter(a => a.level === 'error').length;
    const warnCount = anomalies.filter(a => a.level === 'warning').length;
    const infoCount = anomalies.filter(a => a.level === 'info').length;

    if (headerBadge) {
        if (errCount > 0) {
            headerBadge.textContent = `${errCount} error${errCount > 1 ? 's' : ''}, ${warnCount} warning${warnCount !== 1 ? 's' : ''}`;
        } else if (warnCount > 0) {
            headerBadge.textContent = `${warnCount} warning${warnCount > 1 ? 's' : ''}${infoCount > 0 ? `, ${infoCount} info` : ''}`;
        } else if (infoCount > 0) {
            headerBadge.textContent = `${infoCount} info`;
        } else {
            headerBadge.textContent = 'Clean';
        }
    }

    if (anomalies.length === 0) {
        container.innerHTML = '<div style="color:#2ecc71;font-weight:bold;padding:10px 0;font-size:15px;">&#10003; No anomalies detected — OSPF LSA database looks healthy.</div>';
        return;
    }

    const ICONS  = { error: '&#10007;', warning: '&#9888;', info: '&#9432;' };
    const COLORS = { error: '#e74c3c', warning: '#f39c12', info: '#3498db' };

    container.innerHTML = anomalies.map(a => `
        <div style="display:flex;align-items:flex-start;padding:10px 12px;margin:5px 0;background:white;border-radius:4px;border-left:4px solid ${COLORS[a.level] || '#888'};">
            <span style="color:${COLORS[a.level]};font-size:18px;margin-right:10px;flex-shrink:0;line-height:1.3;">${ICONS[a.level] || '?'}</span>
            <div>
                <span style="display:inline-block;background:${COLORS[a.level]};color:white;font-size:11px;font-weight:bold;padding:1px 7px;border-radius:3px;margin-bottom:5px;letter-spacing:0.5px;">${escHtml(a.code)}</span>
                <div style="color:#333;font-size:13px;line-height:1.6;">${escHtml(a.message)}</div>
            </div>
        </div>`).join('');
}

/* =========================================================
   AREA FILTER BUILDER
   ========================================================= */
/**
 * Populate the Area filter dropdown from parsed area keys.
 *
 * @param {object} db - parsed database object
 */
function buildAreaFilter(db) {
    const select = document.getElementById('area-filter');
    if (!select) return;

    const areaKeys = Object.keys(db.areas);
    select.innerHTML = '<option value="all">All Areas</option>' +
        areaKeys.map(a => {
            let label;
            if (a === '0.0.0.0' || a === '0') {
                label = 'Area 0 (Backbone)';
            } else if (a === '__domain__') {
                label = 'Domain-wide (Type-5/11)';
            } else {
                label = `Area ${a}`;
            }
            return `<option value="${escHtml(a)}">${escHtml(label)}</option>`;
        }).join('');
}

/* =========================================================
   LSA TABLE RENDERER
   ========================================================= */
/**
 * Render the sortable, filterable LSA table.
 *
 * @param {object} db - parsed database object
 */
function renderLSATable(db) {
    const tbody = document.getElementById('lsa-table-body');
    if (!tbody || !db) return;

    let lsas = db.lsas.slice();

    // Apply area filter
    if (currentAreaFilter !== 'all') {
        lsas = lsas.filter(l => l.area === currentAreaFilter);
    }

    // Apply type filter
    lsas = lsas.filter(l => {
        const key = l.type >= 9 ? 9 : l.type;
        return currentTypeFilter.has(key) || currentTypeFilter.has(l.type);
    });

    // Sort
    const sortDir = currentSort.dir === 'asc' ? 1 : -1;
    lsas.sort((a, b) => {
        switch (currentSort.col) {
            case 'type':      return (a.type - b.type) * sortDir;
            case 'linkId':    return a.linkId.localeCompare(b.linkId) * sortDir;
            case 'advRouter': return a.advRouter.localeCompare(b.advRouter) * sortDir;
            case 'age':       return (a.age - b.age) * sortDir;
            case 'seqNum':    return (a.seqNum || '').localeCompare(b.seqNum || '') * sortDir;
            default:          return 0;
        }
    });

    const TYPE_NAMES = {
        1:  'Router',
        2:  'Network',
        3:  'Summary',
        4:  'ASBR Sum',
        5:  'External',
        7:  'NSSA Ext',
        9:  'Opaque-L',
        10: 'Opaque-A',
        11: 'Opaque-AS',
    };

    tbody.innerHTML = lsas.map(l => {
        const rowBg = l.isMaxAge ? '#ffebee' : l.isStale ? '#fffde7' : '#ffffff';
        let statusBadge;
        if (l.isMaxAge) {
            statusBadge = `<span style="background:#e74c3c;color:white;padding:2px 6px;border-radius:3px;font-size:11px;font-weight:bold;white-space:nowrap;">MAXAGE</span>`;
        } else if (l.isStale) {
            statusBadge = `<span style="background:#f39c12;color:white;padding:2px 6px;border-radius:3px;font-size:11px;font-weight:bold;white-space:nowrap;">STALE</span>`;
        } else {
            statusBadge = `<span style="background:#2ecc71;color:white;padding:2px 6px;border-radius:3px;font-size:11px;white-space:nowrap;">FRESH</span>`;
        }
        const typeLabel = TYPE_NAMES[l.type] || `Type-${l.type}`;
        const areaLabel = l.area === '__domain__' ? 'domain' : `Area ${l.area}`;

        return `<tr style="background:${rowBg};border-bottom:1px solid #f0f0f0;">
            <td style="padding:6px 10px;white-space:nowrap;">
                <strong>Type ${l.type}</strong><br>
                <small style="color:#777;">${escHtml(typeLabel)}</small><br>
                <small style="color:#aaa;font-size:10px;">${escHtml(areaLabel)}</small>
            </td>
            <td style="padding:6px 10px;font-family:'Courier New',monospace;font-size:12px;">${escHtml(l.linkId)}</td>
            <td style="padding:6px 10px;font-family:'Courier New',monospace;font-size:12px;">${escHtml(l.advRouter)}</td>
            <td style="padding:6px 10px;font-family:'Courier New',monospace;text-align:right;">${l.age}</td>
            <td style="padding:6px 10px;font-family:'Courier New',monospace;font-size:11px;">${escHtml(l.seqNum || '')}</td>
            <td style="padding:6px 10px;font-family:'Courier New',monospace;font-size:11px;">${escHtml(l.checksum || '')}</td>
            <td style="padding:6px 10px;text-align:center;">${l.linkCount !== null ? l.linkCount : '&#8212;'}</td>
            <td style="padding:6px 10px;">${statusBadge}</td>
        </tr>`;
    }).join('');

    if (lsas.length === 0) {
        tbody.innerHTML = '<tr><td colspan="8" style="text-align:center;padding:20px;color:#888;">No LSAs match the current filter.</td></tr>';
    }

    // Update sort arrows on column headers
    document.querySelectorAll('th[data-col]').forEach(th => {
        const arrow = th.querySelector('.sort-arrow');
        if (!arrow) return;
        if (th.dataset.col === currentSort.col) {
            arrow.textContent = currentSort.dir === 'asc' ? ' \u2191' : ' \u2193';
        } else {
            arrow.textContent = ' \u2195';
        }
    });
}

/* =========================================================
   SORT AND FILTER CONTROLS
   ========================================================= */
/**
 * Toggle a LSA type in the active type filter set and re-render the table.
 *
 * @param {number}  type    - LSA type number (1–11)
 * @param {boolean} checked - whether the checkbox is now checked
 */
function toggleTypeFilter(type, checked) {
    if (checked) {
        currentTypeFilter.add(type);
    } else {
        currentTypeFilter.delete(type);
    }
    if (currentDB) renderLSATable(currentDB);
}

/**
 * Set the active sort column and direction, then re-render.
 *
 * @param {string} col - column key matching currentSort.col values
 */
function setSortCol(col) {
    if (currentSort.col === col) {
        currentSort.dir = currentSort.dir === 'asc' ? 'desc' : 'asc';
    } else {
        currentSort.col = col;
        currentSort.dir = col === 'age' ? 'desc' : 'asc';
    }
    if (currentDB) renderLSATable(currentDB);
}

/* =========================================================
   MAIN ANALYZE FUNCTION
   ========================================================= */
/**
 * Entry point: reads vendor selection and CLI textarea,
 * runs all parsers and renderers, and shows the results area.
 */
function analyzeOSPF() {
    const vendor = document.getElementById('vendor-select').value;
    const raw    = document.getElementById('cli-textarea').value.trim();

    if (!raw) {
        alert('Please paste OSPF database output first.');
        return;
    }

    if (vendor === 'extreme-exos') {
        alert(
            'Extreme ExtremeXOS OSPF parser is not yet available.\n\n' +
            'The CLI output format could not be verified with sufficient confidence to ensure ' +
            'correct parsing. Please use Auto-detect or select a different vendor, ' +
            'or paste output in Cisco IOS-compatible format (e.g. from ExtremeXOS OSPF show commands ' +
            'that mirror FRR/Quagga format).'
        );
        return;
    }

    // Parse, identify roles, detect anomalies
    currentDB = parseOSPFInput(vendor, raw);
    identifyRouterRoles(currentDB);
    const anomalies = detectAnomalies(currentDB);

    // Reset filters to defaults on each new analysis
    currentAreaFilter = 'all';
    document.getElementById('area-filter').value = 'all';

    // Show results area
    const resultsArea = document.getElementById('results-area');
    resultsArea.style.display = 'block';
    resultsArea.scrollIntoView({ behavior: 'smooth', block: 'start' });

    // Render all panels
    renderLSABreakdown(currentDB);
    buildAreaFilter(currentDB);
    renderLSATable(currentDB);
    buildAreaGraph(currentDB);

    // Update area topology badge
    const routerCount = currentDB.topology?.routers.length || 0;
    const realAreaCount = Object.keys(currentDB.areas).filter(a => a !== '__domain__').length;
    const graphBadge = document.getElementById('graph-badge');
    if (graphBadge) {
        graphBadge.textContent =
            `${realAreaCount} area${realAreaCount !== 1 ? 's' : ''}, ` +
            `${routerCount} router${routerCount !== 1 ? 's' : ''}`;
    }

    renderAnomalies(anomalies);
}

/* =========================================================
   LOAD EXAMPLE
   ========================================================= */
/**
 * Load a representative multi-area OSPF database example into the textarea.
 * The example includes: ABR (2.2.2.2), ASBR (4.4.4.4), stale Type-5 LSA,
 * Area 0 (backbone) and Area 1 (non-backbone), multiple LSA types.
 */
function loadExample() {
    document.getElementById('vendor-select').value = 'cisco-ios';
    document.getElementById('cli-textarea').value =
`            OSPF Router with ID (1.1.1.1) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         892         0x80000009 0x00B8C2 2
2.2.2.2         2.2.2.2         901         0x80000009 0x005BDB 3
3.3.3.3         3.3.3.3         888         0x80000009 0x00F7CE 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
10.0.0.1        1.1.1.1         892         0x80000008 0x0089DB

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
192.168.1.0     2.2.2.2         456         0x80000006 0x001234
192.168.2.0     2.2.2.2         450         0x80000005 0x002345
10.0.1.0        3.3.3.3         462         0x80000004 0x003456

                Summary Net Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
10.0.0.0        2.2.2.2         460         0x80000004 0x003456
172.16.0.0      2.2.2.2         455         0x80000003 0x004567

                Router Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum Link count
2.2.2.2         2.2.2.2         900         0x80000007 0x00AABC 2
4.4.4.4         4.4.4.4         885         0x80000006 0x00CCDD 1

                Summary ASB Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
4.4.4.4         2.2.2.2         300         0x80000003 0x005678

                Summary ASB Link States (Area 1)

Link ID         ADV Router      Age         Seq#       Checksum
4.4.4.4         2.2.2.2         298         0x80000003 0x005679

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
10.10.0.0       4.4.4.4         150         0x80000001 0x009900 0
10.20.0.0       4.4.4.4         148         0x80000001 0x009901 0
172.31.0.0      4.4.4.4         1850        0x80000001 0x009902 0`;
}

/* =========================================================
   KEYBOARD SHORTCUT — Ctrl+Enter / Cmd+Enter
   ========================================================= */
document.addEventListener('keydown', function (e) {
    if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
        analyzeOSPF();
    }
});
</script>