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	<title>網狀路由協議 彙整 - 碼蟻創研工坊 - CODEANT STUDIOS</title>
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	<title>網狀路由協議 彙整 - 碼蟻創研工坊 - CODEANT STUDIOS</title>
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		<title>簡單分類 &#8211; 網狀路由協議(Mesh Routing Protocol)</title>
		<link>http://codeant.cc/archives/22</link>
		
		<dc:creator><![CDATA[codeant]]></dc:creator>
		<pubDate>Wed, 10 Jul 2013 20:16:36 +0000</pubDate>
				<category><![CDATA[Netowrk]]></category>
		<category><![CDATA[網狀路由協議]]></category>
		<guid isPermaLink="false">http://codeant.cc/2013/07/11/mesh-routing-protocol-introduce/</guid>

					<description><![CDATA[<p>在過去，已經有需多適用於WMNs或是MANETs的網狀路由協議被提出，依照特性可以將其分為二類，即主動式（Pr [&#8230;]</p>
<p>這篇文章 <a href="http://codeant.cc/archives/22">簡單分類 &#8211; 網狀路由協議(Mesh Routing Protocol)</a> 最早出現於 <a href="http://codeant.cc">碼蟻創研工坊 - CODEANT STUDIOS</a>。</p>
]]></description>
										<content:encoded><![CDATA[<p style="text-align: justify; text-indent: 24pt; line-height: 150%;"><span style="font-size: 16px; line-height: 26px;">在過去，已經有需多適用於WMNs或是MANETs的網狀路由協議被提出，依照特性可以將其分為二類，即主動式（Proactive）與被動式（Reactive）路由協議。</span></p>
<p>  <span id="more-22"></span>  </p>
<p style="font-size: 16px; line-height: 26px; text-align: justify; text-indent: 24pt;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;">主動式的路由協議維護了每一個網路節點的路由資訊，並通過週期性的方式來進行路由表的更新，採用廣播（Broadcast）的方式送出路由訊息封包，一般稱之為Hello Message，用以探詢目前的網路拓撲及裝置本身與鄰近節點（Neighbor Node）的連線狀況，這樣預先建立路由表的方式可以讓尋找路由（Routing Discovery）的反應時間（Latency）縮短，但是系統負荷（Overhead）及記憶體消耗（Memory Consumption）也比較大，當網路節點的數量龐大時，路由訊息封包的數量對系統的頻寬也會造成負擔。</span></p>
<p style="font-size: 16px; line-height: 26px; text-align: justify; text-indent: 24pt;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;">被動式的路由協議其路由表的建立是依需求而定，也就是當有資料需要進行傳送時，才開始進行，也因此在資料傳送之前必須先進行路由探查的動作，在連線建立的初期會有較高的時間延遲，但是也因為維護的路由表較小，在系統負荷及記憶體消耗上比起主動式路由協議都有更好的表現，但相對較不適用於對延遲性有較高要求的應用。</span></p>
<p style="font-size: 16px; line-height: 26px; text-align: justify; text-indent: 24pt;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;">下面表格對二種路由協議在特性上做了一個比較。</span></p>
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<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>被動式（</strong><strong>Reactive</strong><strong>）</strong></span></p>
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<td style="width: 152.1pt; border-style: solid solid solid none; border-top-color: windowtext; border-right-color: windowtext; border-bottom-color: windowtext; border-top-width: 1pt; border-right-width: 1pt; border-bottom-width: 1pt; padding: 0cm 5.4pt;" valign="top" width="203">
<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>主動式（</strong><strong>Proactive</strong><strong>）</strong></span></p>
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<p style="text-align: justify; line-height: 150%;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>路由資訊的建立</strong></span></p>
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<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>有需要才建立</strong></span></p>
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<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>預先建立並週期性更新</strong></span></p>
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<p style="text-align: justify; line-height: 150%;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>尋找路由的延遲時間</strong></span></p>
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<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>高</strong></span></p>
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<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>低</strong></span></p>
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<p style="text-align: justify; line-height: 150%;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>系統負荷</strong></span></p>
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<td style="width: 152.1pt; border-style: none solid solid none; border-bottom-color: windowtext; border-bottom-width: 1pt; border-right-color: windowtext; border-right-width: 1pt; padding: 0cm 5.4pt;" valign="top" width="203">
<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>低</strong></span></p>
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<td style="width: 152.1pt; border-style: none solid solid none; border-bottom-color: windowtext; border-bottom-width: 1pt; border-right-color: windowtext; border-right-width: 1pt; padding: 0cm 5.4pt;" valign="top" width="203">
<p style="text-align: center; line-height: 150%;" align="center"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><strong>高</strong></span></p>
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<p style="text-align: left;"><span style="font-family: 'comic sans ms', sans-serif;"><span style="font-size: 12pt;">&nbsp; &nbsp; &nbsp; </span></span></p>
<p style="text-align: left;"><span style="font-size: 16px; line-height: 26px;"><span style="font-size: 12pt;">此外，依照不同的路由方法，可分為距離向量（</span><span style="font-size: 12pt;">Distance Vector</span><span style="font-size: 12pt;">）法與連結狀態（</span><span style="font-size: 12pt;">Link Status</span><span style="font-size: 12pt;">）法等二種。二者主要的差異在於採用距離向量法的路由協議中，以傳輸路徑中最佳的單跳節點（</span><span style="font-size: 12pt;">Best Next Hop</span><span style="font-size: 12pt;">）進行資料的傳送，無需取得完整的網路拓撲資訊；而使用連接狀態法的路由協議，必須取得完整的網路拓撲及每個節點間的路徑品質，藉此算出最佳路徑（</span><span style="font-size: 12pt;">Best Path</span><span style="font-size: 12pt;">）進行路由。</span></span></p>
</p></div>
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