.. 제목: VLAN 및 802.1Q 트렁킹 분석기
.. 슬러그: vlan-trunking-analyzer
.. 날짜: 2026-03-27 12:00:00 UTC
.. 태그: 네트워킹, VLAN, 802.1q, 계산기, 도구
.. 카테고리: 계산기
.. 링크:
.. 설명: 802.1Q 트렁크 오버헤드를 계산하고, VLAN 허용 목록을 구문 분석하고, 네트워크 트렁크 설계에 대한 QinQ 이중 태그 MTU 영향을 계획합니다.
.. 유형: 텍스트
<style>
/* ── CANONICAL DESIGN SYSTEM ─────────────────────────────────────────────── */
.calc-container { max-width: 900px; margin: 20px auto; padding: 20px; }
.calc-header {
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}
.calc-header h2 { margin-top: 0; color: white; font-size: 28px; margin-bottom: 10px; }
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}
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.result-section { background: white; border: 1px solid #e0e0e0; border-radius: 8px; margin-top: 20px; 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; }
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/* ── END CANONICAL ────────────────────────────────────────────────────────── */

.vlan-tag  { background: #4CAF50; color: white; padding: 3px 8px; border-radius: 12px; font-size: 12px; display: inline-block; margin: 2px; }
.vlan-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }
/* Labels inside .section-content (not on purple bg) need dark text */
.section-content .input-group label { color: #555; }
.section-content .input-group input,
.section-content .input-group select {
    border: 1px solid #ddd; background: white;
}
.section-content .input-group input:focus,
.section-content .input-group select:focus {
    border-color: #4CAF50; box-shadow: 0 0 0 3px rgba(76,175,80,0.1); background: white;
}
</style>
<div class="calc-container">
<div class="calc-header">
<h2>VLAN 및 802.1Q 트렁킹 분석기</h2>
<p>VLAN 허용 목록을 구문 분석하고, 태그 오버헤드를 계산하고, QinQ MTU 영향을 계획합니다.</p>
</div>
섹션 1: VLAN 허용 목록 파서
<div class="result-section">
<div class="section-header">VLAN 허용 목록 파서</div>
<div class="section-content">
<div class="input-grid">
<div class="input-group" style="grid-column:1/-1">
<label>VLAN 목록(예: 1-10,20,100-200,4094)</label>
<input id="vlanList" placeholder="1-10,20,100-200,4094" type="text" value="1-10,20,100-200,4094"/>
</div>
</div>
<div class="button-container" style="justify-content:flex-start;margin-top:12px">
<button class="calc-button" onclick="parseVlanList()">구문 분석</button>
</div>
<div id="vlanResult" style="display:none;margin-top:15px"></div>
</div>
</div>
섹션 2: 802.1Q 태그 오버헤드 계산기
<div class="result-section">
<div class="section-header">802.1Q 태그 오버헤드 계산기</div>
<div class="section-content">
<div class="input-grid">
<div class="input-group">
<label>기본 MTU(바이트)</label>
<input id="baseMtu" max="9216" min="64" type="number" value="1500"/>
</div>
<div class="input-group">
<label>태깅 모드</label>
<select id="tagMode">
<option value="untagged">태그 없음(오버헤드 없음)</option>
<option selected="" value="dot1q">802.1Q(단일 태그, +4바이트)</option>
<option value="qinq">QinQ / 802.1ad(이중 태그, +8바이트)</option>
</select>
</div>
<div class="input-group">
<label>링크 속도(Gbps)</label>
<select id="linkSpeed">
<option value="1">1Gbps</option>
<option selected="" value="10">10Gbps</option>
<option value="25">25Gbps</option>
<option value="40">40Gbps</option>
<option value="100">100Gbps</option>
<option value="400">400Gbps</option>
</select>
</div>
</div>
<div class="button-container" style="justify-content:flex-start;margin-top:12px">
<button class="calc-button" onclick="calcOverhead()">믿다</button>
</div>
<div id="overheadResult" style="display:none;margin-top:15px"></div>
</div>
</div>
섹션 3: QinQ / 802.1ad 태그 바이트 레이아웃 참조
<div class="result-section">
<div class="section-header">QinQ / 802.1ad 이중 태그 계획</div>
<div class="section-content">
<table>
<tr><th>프레임 유형</th><th>태그 바이트</th><th>에테르 종류</th><th>필드가 추가됨</th></tr>
<tr><td>태그가 지정되지 않은 802.3</td><td>0</td><td>—</td><td>—</td></tr>
<tr><td>802.1Q(dot1q)</td><td>+4</td><td>0x8100</td><td>TPID(2) + TCI: PCP(3) + DEI(1) + VID(12)</td></tr>
<tr><td>QinQ / 802.1ad</td><td>+8</td><td>0x88A8 외부</td><td>외부 태그(4) + 내부 802.1Q 태그(4)</td></tr>
</table>
</div>
</div>
</div>
<script>
function expandVlanRange(str) {
    const vlans = new Set();
    str.split(',').forEach(part => {
        part = part.trim();
        if (part.includes('-')) {
            const [start, end] = part.split('-').map(Number);
            if (!isNaN(start) && !isNaN(end) && start <= end && start >= 1 && end <= 4094) {
                for (let v = start; v <= end; v++) vlans.add(v);
            }
        } else {
            const v = parseInt(part);
            if (!isNaN(v) && v >= 1 && v <= 4094) vlans.add(v);
        }
    });
    return Array.from(vlans).sort((a, b) => a - b);
}

function compressVlanList(vlans) {
    if (!vlans.length) return '';
    const ranges = [];
    let start = vlans[0], end = vlans[0];
    for (let i = 1; i < vlans.length; i++) {
        if (vlans[i] === end + 1) { end = vlans[i]; }
        else {
            ranges.push(start === end ? `${start}` : `${start}-${end}`);
            start = end = vlans[i];
        }
    }
    ranges.push(start === end ? `${start}` : `${start}-${end}`);
    return ranges.join(',');
}

function parseVlanList() {
    const input = document.getElementById('vlanList').value;
    const vlans = expandVlanRange(input);
    const div = document.getElementById('vlanResult');
    div.style.display = 'block';
    if (!vlans.length) { div.innerHTML = '<strong style="color:red">No valid VLANs found. Valid range: 1\u20134094.</strong>'; return; }
    const tagsHtml = vlans.slice(0, 100).map(v => `<span class="vlan-tag">${v}</span>`).join('') +
        (vlans.length > 100 ? `<span class="vlan-tag">+${vlans.length - 100} more</span>` : '');
    div.innerHTML = `
        <strong>Count:</strong> ${vlans.length} VLANs<br>
        <strong>Normalized:</strong> <code>${compressVlanList(vlans)}</code><br>
        <strong>Range:</strong> VLAN ${vlans[0]} \u2013 ${vlans[vlans.length - 1]}<br>
        <div class="vlan-tags">${tagsHtml}</div>`;
}

function calcOverhead() {
    const baseMtu = parseInt(document.getElementById('baseMtu').value);
    const div = document.getElementById('overheadResult');
    div.style.display = 'block';
    if (isNaN(baseMtu) || baseMtu < 64 || baseMtu > 9216) {
        div.innerHTML = '<strong style="color:red">Invalid MTU. Enter a value between 64\u20139216 bytes.</strong>';
        return;
    }
    const mode = document.getElementById('tagMode').value;
    const speedGbps = parseFloat(document.getElementById('linkSpeed').value);
    const tagBytes = mode === 'untagged' ? 0 : mode === 'dot1q' ? 4 : 8;
    const effectiveMtu = baseMtu - tagBytes;
    const overheadPct = tagBytes > 0 ? (tagBytes / (baseMtu + tagBytes + 18) * 100).toFixed(3) : 0;
    const throughputLoss = tagBytes > 0
        ? ((tagBytes / (baseMtu + 18 + tagBytes)) * speedGbps).toFixed(4)
        : 0;
    div.innerHTML = `
        <strong>Tag overhead:</strong> ${tagBytes} bytes per frame<br>
        <strong>Effective payload MTU:</strong> ${effectiveMtu} bytes (set this on routed sub-interfaces)<br>
        <strong>Frame overhead:</strong> ${overheadPct}% of wire bandwidth consumed by tag bytes<br>
        <strong>Throughput lost at ${speedGbps} Gbps:</strong> ~${throughputLoss} Gbps<br>
        ${tagBytes > 0 ? `<br><em>Recommendation: If running IP over this trunk, set interface MTU to ${effectiveMtu} to avoid fragmentation, or increase the physical MTU to ${baseMtu + tagBytes} if the switch supports jumbo frames.</em>` : ''}`;
}
</script>