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<div class=Section1 style='layout-grid:15.6pt'>
<p class=MsoNormal align=center style='text-align:center'><b style='mso-bidi-font-weight:
normal'><span lang=EN-US style='font-size:14.0pt'>IEEE802.1Q</span></b><b
style='mso-bidi-font-weight:normal'><span style='font-size:14.0pt;font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>与</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:14.0pt'>ISL</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:14.0pt;
mso-fareast-language:JA'><o:p></o:p></span></b></p>
<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
style='font-size:12.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:red'>汇聚方式</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='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>在交换机的汇聚链接上，可以通过对数据帧附加</span><span
lang=EN-US>VLAN</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>信息，构建跨越多台交换机的</span><span lang=EN-US>VLAN</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>附加</span><span lang=EN-US>VLAN</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>信息的方法，最具有代表性的有：</span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l5 level1 lfo8;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='font-family:
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style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>IEEE802.1Q</span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l5 level1 lfo8;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='font-family:
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</span></span></span><![endif]><span lang=EN-US>ISL</span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>现在就让我们看看这两种协议分别如何对数据帧附加</span><span
lang=EN-US>VLAN</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>信息。</span><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span lang=EN-US
style='font-size:12.0pt;color:red'>IEEE802.1Q<o:p></o:p></span></b></p>
<p class=MsoNormal><span lang=EN-US>IEEE802.1Q</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>，俗称“</span><span
lang=EN-US>Dot One Q</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>”，是经过</span><span
lang=EN-US>IEEE</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>认证的对数据帧附加</span><span lang=EN-US>VLAN</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>识别信息的协议。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>在此，请大家先回忆一下以太网数据帧的标准格式。</span></p>
<p class=MsoNormal><span lang=EN-US>IEEE802.1Q</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>所附加的</span><span
lang=EN-US>VLAN</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>识别信息，<span style='color:blue'>位于数据帧中“发送源</span></span><span
lang=EN-US style='color:blue'>MAC</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>地址”与“类别域（</span><span
lang=EN-US style='color:blue'>Type Field</span><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>）”之间</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。具体内容为</span><span lang=EN-US>2</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>字节的</span><span lang=EN-US>TPID</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>和</span><span lang=EN-US>2</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>字节的</span><span
lang=EN-US>TCI</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>，共计</span><span lang=EN-US>4</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>字节。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>在数据帧中添加了</span><span lang=EN-US>4</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>字节的内容，那么</span><span lang=EN-US>CRC</span><span class=GramE><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>值自然</span></span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>也会有所变化。<span
style='color:red'>这时数据帧上的</span></span><span lang=EN-US style='color:red'>CRC</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
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<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
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<p class=MsoNormal><span lang=EN-US>6Bytes</span></p>
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<p class=MsoNormal><span lang=EN-US>6Bytes</span></p>
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<p class=MsoNormal><span lang=EN-US>2Bytes</span></p>
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<p class=MsoNormal><span lang=EN-US>46</span><span style='font-family:
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<p class=MsoNormal><span lang=EN-US>4Bytes</span></p>
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