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     <p class=MsoNormal><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
     mso-hansi-font-family:"Times New Roman"'>每增加一個</span><span lang=EN-US>VLAN</span><span
     style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
     "Times New Roman"'>，都需要添加一條互聯網線，并且還需要額外的端口。</span></p>
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<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>但是，這個辦法從<span
style='color:red'>擴展性和管理效率來看都不好</span>。例如，在現有網絡基礎上再新建</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>VLAN</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>時，為了讓這個</span><span lang=EN-US style='mso-bidi-font-size:
10.5pt'>VLAN</span><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>能夠互通，就需要在交換機間連接新的網線。建筑物樓層間的縱向布線是比較麻煩的，一般不能由基層管理人員隨意進行。并且，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>VLAN</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>越多，樓層間（嚴格地說是交換機間）互聯所需的端口也越來越多，交換機端口的利用效率低是對資源的一種浪費、也限制了網絡的擴展。</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>為了避免這種低效率的連接方式，人們想辦法讓<span
style='color:blue'>交換機間互聯的網線集中到一根上，這時使用的就是匯聚鏈接（</span></span><span lang=EN-US
style='mso-bidi-font-size:10.5pt;color:blue'>Trunk Link</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>）</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
style='font-size:12.0pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:red'>何謂匯聚鏈接？</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:12.0pt;
color:red'><o:p></o:p></span></b></p>

<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>匯聚鏈接（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Trunk Link</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>）指的是<span style='color:blue'>能夠轉發多個不同</span></span><span
lang=EN-US style='mso-bidi-font-size:10.5pt;color:blue'>VLAN</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>的通信的端口</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>匯聚鏈路上流通的數據幀，都被附加了用于識別分屬于哪個</span><span lang=EN-US style='mso-bidi-font-size:
10.5pt;color:blue'>VLAN</span><span style='mso-bidi-font-size:10.5pt;
font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>的特殊信息</span><span style='mso-bidi-font-size:10.5pt;
font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span><span lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>現在再讓我們回過頭來考慮一下剛才那個網絡如果采用匯聚鏈路又會如何呢？用戶只需要簡單地將交換機間互聯的端口設定為匯聚鏈接就可以了。<span
style='color:red'>這時使用的網線還是普通的</span></span><span lang=EN-US style='mso-bidi-font-size:
10.5pt;color:red'>UTP</span><span style='mso-bidi-font-size:10.5pt;font-family:
宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:red'>線</span><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>，而不是什么其他的特殊布線。圖例中是交換機間互聯，因此需要用交叉線來連接。</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>接下來，讓我們具體看看匯聚鏈接是如何實現跨越交換機間的</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>VLAN</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>的。</span><span lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span lang=EN-US style='mso-bidi-font-size:10.5pt'>A</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>發送的數據幀<span style='color:blue'>從交換機</span></span><span
lang=EN-US style='mso-bidi-font-size:10.5pt;color:blue'>1</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>經過匯聚鏈路到達交換機</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt;color:blue'>2</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>時，在數據幀上附加了表示屬于紅色</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt;color:blue'>VLAN</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>的標記</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>交換機</span><span lang=EN-US style='mso-bidi-font-size:10.5pt;
color:blue'>2</span><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>收到數據幀后，經過檢查</span><span lang=EN-US style='mso-bidi-font-size:10.5pt;
color:blue'>VLAN</span><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>標識發現這個數據幀是屬于紅色</span><span lang=EN-US style='mso-bidi-font-size:
10.5pt;color:blue'>VLAN</span><span style='mso-bidi-font-size:10.5pt;
font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>的，因此去除標記后根據需要將復原的數據幀只轉發給其他屬于紅色</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt;color:blue'>VLAN</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>的端口</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。這時的轉送，是指經過確認目標</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>MAC</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>地址并與</span><span lang=EN-US style='mso-bidi-font-size:10.5pt'>MAC</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>地址列表比對后只轉發<span class=GramE>給目標</span></span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>MAC</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>地址所連的端口。只有當數據幀是一個廣播幀、多播<span class=GramE>幀</span>或是目標不明<span
class=GramE>的幀時</span>，它才會被轉發到所有屬于紅色</span><span lang=EN-US style='mso-bidi-font-size:
10.5pt'>VLAN</span><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的端口。</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal><span style='mso-bidi-font-size:10.5pt;font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>藍色</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>VLAN</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>發送數據幀時的情形也與此相同。</span><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></p>

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style='mso-spacerun:yes'>&nbsp;</span>SHAPE<span
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