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<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>為了與使用路由器進行</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"'>間路由對比，讓我們同樣來考慮一下計算機</span><span lang=EN-US>A</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>與計算機</span><span lang=EN-US>B</span><span style='font-family:
宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>之間通信時的情況。首先是目標地址為</span><span
lang=EN-US>B</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的數據幀被發到交換機；通過檢索同一</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"'>的</span><span lang=EN-US>MAC</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>地址列表發現計算機</span><span lang=EN-US>B</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>連在交換機的端口</span><span lang=EN-US>2</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>上；因此將數據幀轉發給端口</span><span lang=EN-US>2</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
lang=EN-US><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'>使用三層交換機進行</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:12.0pt;
color:red'>VLAN</span></b><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'>間路由（</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:12.0pt;
color:red'>VLAN</span></b><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'>間通信）</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 align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>接下來設想一下計算機</span><span lang=EN-US>A</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>與計算機</span><span lang=EN-US>C</span><span style='font-family:
宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>間通信時的情形。<span
style='color:blue'>針對目標</span></span><span lang=EN-US style='color:blue'>IP</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>地址，計算機</span><span lang=EN-US style='color:blue'>A</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>可以判斷出通信對象不屬于同一個網絡，因此向默認網關發送數據（</span><span
lang=EN-US style='color:blue'>Frame 1</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>）</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。</span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>交換機通過檢索</span><span lang=EN-US>MAC</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>地址列表后，<span style='color:blue'>經由內部匯聚鏈接，將數據幀轉發給路由模塊。在通過內部匯聚鏈路時，數據幀被附加了屬于紅色</span></span><span
lang=EN-US style='color:blue'>VLAN</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>的</span><span lang=EN-US style='color:blue'>VLAN</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>識別信息（</span><span lang=EN-US style='color:blue'>Frame
2</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>）</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>路由模塊在收到數據幀時，<span style='color:blue'>先由數據幀附加的</span></span><span
lang=EN-US style='color:blue'>VLAN</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>識別信息分辨出它屬于紅色</span><span lang=EN-US style='color:blue'>VLAN</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>，據此判斷由紅色</span><span lang=EN-US style='color:
blue'>VLAN</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>接口負責接收并進行路由處理</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。因為目標網絡</span><span lang=EN-US>192.168.2.0/24</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>是直連路由器的網絡、且對應藍色</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"'>；因此，接下來就會從藍色</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"'>接口經由內部匯聚鏈路轉發回交換模塊。<span style='color:blue'>在通過匯聚鏈路時，這次數據幀被附加上屬于藍色</span></span><span
lang=EN-US style='color:blue'>VLAN</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>的識別信息（</span><span lang=EN-US style='color:blue'>Frame 3</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>）</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。</span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>交換機收到這個幀后，<span style='color:blue'>檢索藍色</span></span><span
lang=EN-US style='color:blue'>VLAN</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>的</span><span lang=EN-US style='color:blue'>MAC</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>地址列表，確認需要將它轉發給端口</span><span lang=EN-US
style='color:blue'>3</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。由于端口</span><span
lang=EN-US>3</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>是通常的訪問鏈接，因此轉發前會先將</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"'>識別信息除去（</span><span lang=EN-US>Frame 4</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>）。最終，計算機</span><span lang=EN-US>C</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>成功地收到交換機轉發來的數據幀。</span></p>

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