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2014-05-06-floodlight-lldp-problem.html
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<h2 class="post-title" itemprop="name headline">Floodlight LLDP problem
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<p>問題來源:<br><a href="https://groups.google.com/a/openflowhub.org/forum/#!topic/floodlight-dev/15mTiLL0__A" target="_blank" rel="noopener">Floodlight LLDP problem</a></p>
<p>問題描述:</p>
<ul>
<li>從floodlight去觀察，會發現有Link的<code>{source,dest}</code>都是相同的<code>dpid</code>但是不同的<code>port</code></li>
</ul>
<p>想法思路:</p>
<ul>
<li><p>從該link的結果可以先猜測應該是LLDP從<code>port 2</code>送出去後不知道為什麼從<code>port 3</code>給接收到了.</p>
</li>
<li><p>那我想到的時候，中間兩個switch使用<code>傳統的learning switch</code>把這個<code>LLDP</code>給一路廣播下去，使得LLDP繞了回來，我覺得可能是後面兩個switch還沒有連上controller的時候會把自己運作成傳統的switch，因此我就詢問對方的網路環境.</p>
</li>
<li>在確認對方網路並非是mininet的後，就請對方先把<code>ovs</code>給設定成<code>secure mode</code>，在這種mode下，若是沒有跟controller連線，ovs就不會有任何的行為.</li>
<li>最後對方表示一切都正常了，所以發生原因應該就是中間的switch尚未變成openflow swtich前會把LLDP給透過傳統的方式給轉發下去，導致LLDP繞了回去.</li>
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