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	<title>HWMP 彙整 - 碼蟻創研工坊 - CODEANT STUDIOS</title>
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	<title>HWMP 彙整 - 碼蟻創研工坊 - CODEANT STUDIOS</title>
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		<title>網狀路由協議 &#8211; 802.11s Mesh Standard</title>
		<link>http://codeant.cc/archives/25</link>
		
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		<pubDate>Wed, 10 Jul 2013 23:57:45 +0000</pubDate>
				<category><![CDATA[Netowrk]]></category>
		<category><![CDATA[802.11s]]></category>
		<category><![CDATA[HWMP]]></category>
		<category><![CDATA[Mesh]]></category>
		<category><![CDATA[自組網]]></category>
		<guid isPermaLink="false">http://codeant.cc/2013/07/11/80211s-mesh-standard-1/</guid>

					<description><![CDATA[<p>802.11s Mesh Standard所使用的路由協議名稱為Hybrid Wireless Mesh Pr [&#8230;]</p>
<p>這篇文章 <a href="http://codeant.cc/archives/25">網狀路由協議 &#8211; 802.11s Mesh Standard</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;">802.11s Mesh Standard所使用的路由協議名稱為Hybrid Wireless Mesh Protocol（HWMP），它是一個運行OSI第二層的網狀路由協議，可以使用被動式或是主動式的路由協議。</span></p>
<p>  <span id="more-25"></span>  </p>
<p style="text-indent: 24pt; line-height: 150%; text-align: center;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"><img fetchpriority="high" decoding="async" class=" size-full wp-image-24" src="http://codeant.cc/wp-content/uploads/2013/07/images_phocagallery_Network_hwmp-protocol.jpg" alt="hwmp-protocol" width="455" height="338" srcset="http://codeant.cc/wp-content/uploads/2013/07/images_phocagallery_Network_hwmp-protocol.jpg 455w, http://codeant.cc/wp-content/uploads/2013/07/images_phocagallery_Network_hwmp-protocol-300x223.jpg 300w" sizes="(max-width: 455px) 100vw, 455px" /></span></p>
<p style="text-indent: 24pt; line-height: 150%; text-align: center;"><span style="font-family: 'comic sans ms', sans-serif; font-size: 12pt;"></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;">802.11s為電機電子工程師學會（Institute of Electrical and Electronics Engineers，簡稱IEEE）所制定的標準，此路由協議已被實作為Linux內核中的標準模組之一（Project open80211s），為最廣為人知的OSI第二層網狀路由協議之一。</span></p>
<p style="font-size: 16px; line-height: 26px; text-align: justify; text-indent: 24pt;">&nbsp;</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;">802.11s包含了四種路由訊息封包，分別為根節點宣告（Root Announcement，簡稱RANN）、路徑要求（Path Request，簡稱PREQ）、路徑回覆（Path Reply，簡稱PREP）、路徑錯誤（Path Error，簡稱PERR）。</span></p>
<p style="font-size: 16px; line-height: 26px; text-align: justify; text-indent: 24pt;">&nbsp;</p>
<p style="font-size: 16px; line-height: 26px; text-align: justify; text-indent: 24pt;"><span style="font-size: 12pt; font-family: 'comic sans ms', sans-serif;">802.11s的主動式路由協議會建立起一個樹狀的路由拓撲（tree based routing），根節點（Root Node）可透過二種方式建立起路由表，一種是採用RANN封包，另一種是用PREQ封包，差別在於採用RANN封包的方式其PREQ是由根節點以外的裝置以單點直播（Unicast）的方式送出給根節點，而根節點必須回覆PREP封包，但在採用PREQ封包的方式中，不會使用到PREP封包，而且PREQ封包是由根節點發出，主動式路由所建立出的路由表是用來與根節點進行通訊，若節點間需要點對點直接通訊，就會使用被動式的路由協議，與除此之外，主動式的路由協議還可以選用Radio Aware Optimized Link State Routing （RAOLSR）的方式，運作機制與OLSR路由協議類似。</span></p>
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