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<h2 class="post-title" itemprop="name headline">Multipath routing with Group table at mininet
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<h2 id="Purpose"><a href="#Purpose" class="headerlink" title="Purpose"></a>Purpose</h2><p>在Group table中，有一個類型為<code>select</code>，此類型的group會隨機執行底下的其中一個bucket。若我們將所有的output action都放進這個group中，則switch會將封包隨機導向不同的port，藉此達成multipath routing的功用。</p>
<h2 id="Environment"><a href="#Environment" class="headerlink" title="Environment"></a>Environment</h2><p>使用下列的圖作為我們的網路環境，在此圖中。S1~S5都是支援OpenFlow 1.3的OpenFlow switch，左邊的Host 1則是一個Sender，會對於右邊的九個Host發送資料<br><img src="http://user-image.logdown.io/user/415/blog/415/post/207387/9eJUokmsTiuroa8UGsh4_picture.png" alt="picture.png"></p>
<a id="more"></a>
<h2 id="Step"><a href="#Step" class="headerlink" title="Step"></a>Step</h2><ul>
<li><p>使用mininet搭配其script來創造網路拓墣，該script可以在此找到 <a href="https://gist.github.com/hwchiu/52b606032c9512dd1e83" target="_blank" rel="noopener">group.py</a></p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mn --custom group.py --topo group</span><br></pre></td></tr></table></figure>
</li>
<li><p>讓所有的創造的openvswitch都支持openflow 1.3</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">ovs-vsctl <span class="built_in">set</span> bridge s1 protocols=OpenFlow13</span><br><span class="line">ovs-vsctl <span class="built_in">set</span> bridge s2 protocols=OpenFlow13</span><br><span class="line">ovs-vsctl <span class="built_in">set</span> bridge s3 protocols=OpenFlow13</span><br><span class="line">ovs-vsctl <span class="built_in">set</span> bridge s4 protocols=OpenFlow13</span><br><span class="line">ovs-vsctl <span class="built_in">set</span> bridge s5 protocols=OpenFlow13</span><br></pre></td></tr></table></figure>
</li>
<li><p>在S1上面加入一個group table，此group table能夠把封包給隨機導向Port 1,2,3。</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ovs-ofctl -O OpenFlow13 add-group s1 group_id=5566,<span class="built_in">type</span>=select,bucket=output:1,bucket=output:2,bucket=output:3</span><br></pre></td></tr></table></figure>
</li>
<li><p>在S1上面加入一個Flow entry，所有從Host1進來的封包，都去執行剛剛所創立的group table。</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ovs-ofctl -O OpenFlow13 add-flow s1 in_port=4,actions=group:5566</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p><img src="http://user-image.logdown.io/user/415/blog/415/post/207387/fAdC3uQrRbiFV0ih3CD8_picture.png" alt="picture.png"></p>
<ul>
<li>由於本實驗沒有採用任何Controller，因此要手動的寫入Flow entry到其餘的Switch。</li>
<li><p>在S1上面加入剩下的Flow entry，使得送回Host1的封包能夠順利抵達Host1</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">ovs-ofctl -O OpenFlow13 add-flow s1 eth_type=0x0800,ip_dst=10.0.0.1,actions=output:4</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s1 eth_type=0x0806,ip_dst=10.0.0.1,actions=output:4</span><br></pre></td></tr></table></figure>
</li>
<li><p>在S2、S3、S4上各加入兩條Flow entry，讓封包能夠通過</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">ovs-ofctl -O OpenFlow13 add-flow s2 in_port=1,actions=output:2</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s2 in_port=2,actions=output:1</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s3 in_port=1,actions=output:2</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s3 in_port=2,actions=output:1</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s4 in_port=1,actions=output:2</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s4 in_port=2,actions=output:1</span><br></pre></td></tr></table></figure>
</li>
<li><p>在S5上根據destination ip來把封包導向不同的host</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#IP</span></span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.2,actions=output:4 </span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.3,actions=output:5</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.4,actions=output:6 </span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.5,actions=output:7</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.6,actions=output:8</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.7,actions=output:9 </span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.8,actions=output:10</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.9,actions=output:11</span><br><span class="line"><span class="comment">#ARP</span></span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.2,actions=output:4 </span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.3,actions=output:5</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.4,actions=output:6</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.5,actions=output:7</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.6,actions=output:8</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.7,actions=output:9 </span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.8,actions=output:10</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.9,actions=output:11</span><br></pre></td></tr></table></figure>
</li>
<li><p>由於本實驗要觀察的是Host1送過來的封包能否走不同路徑，對於送回給Host1的封包就固定於同一條路徑(S5 - S2 - S1)</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0800,ip_dst=10.0.0.1,actions=output:1</span><br><span class="line">ovs-ofctl -O OpenFlow13 add-flow s5 eth_type=0x0806,ip_dst=10.0.0.1,actions=output:1</span><br></pre></td></tr></table></figure>
</li>
<li><p>接下來依序執行下列指令來產生網路流量</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">mininet> iperfudp 1G h1 h2</span><br><span class="line">mininet> iperfudp 1G h1 h3</span><br><span class="line">mininet> iperfudp 1G h1 h4</span><br><span class="line">mininet> iperfudp 1G h1 h5</span><br><span class="line">mininet> iperfudp 1G h1 h6</span><br><span class="line">mininet> iperfudp 1G h1 h7</span><br><span class="line">mininet> iperfudp 1G h1 h8</span><br><span class="line">mininet> iperfudp 1G h1 h9</span><br><span class="line">mininet> iperfudp 1G h1 h10</span><br></pre></td></tr></table></figure>
</li>
<li><p>接下來觀察每個switch的flow table。結果如圖</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">mininet> sh ovs-ofctl dump-flows s2 -O OpenFlow13</span><br><span class="line">mininet> sh ovs-ofctl dump-flows s3 -O OpenFlow13</span><br><span class="line">mininet> sh ovs-ofctl dump-flows s4 -O OpenFlow13</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p><img src="http://user-image.logdown.io/user/415/blog/415/post/207387/8z6XUIASRbq93DoI7hFS_picture.png" alt="picture.png"></p>
<ul>
<li>在圖中可以觀察到，S2、S3、S4上面都有流量經過，證實了S1使用了group table會將不同的flow給隨機執行不同的buckets，在此範例中則是會導向不同的port。</li>
</ul>
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