vlan12.htm

V-LAN 虚拟局域网的学习笔记

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<body lang=ZH-CN link=blue vlink=purple style='tab-interval:21.0pt;text-justify-trim:
punctuation'>

<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 style='font-size:14.0pt;font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>使用</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:14.0pt'>VLAN</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"'>设计局域网</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:14.0pt'><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'>使用</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:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:red'>设计局域网的特点</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:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>通过使用</span><span lang=EN-US style='color:blue'>VLAN</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>构建局域网，用户能够不受物理链路的限制而自由地分割广播域。</span><span
lang=EN-US style='color:blue'><o:p></o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>另外，通过先前提到的路由器与三层交换机提供的</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"'>间路由，能够<span style='color:blue'>适应灵活多变的网络构成</span>。</span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>但是，<span style='color:red'>由于利用</span></span><span
lang=EN-US style='color:red'>VLAN</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:red'>容易导致网络构成复杂化，因此也会造成整个网络的组成难以把握</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 align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>可以这样说，在利用</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"'>时，除了有：</span></p>

<p class=MsoNormal align=left style='margin-left:21.0pt;text-align:left;
text-indent:-21.0pt;mso-pagination:widow-orphan;mso-list:l5 level1 lfo12;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='font-family:
Wingdings;mso-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;
color:blue'><span style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>网络构成灵活多变</span><span
lang=EN-US style='color:blue'><o:p></o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>这个优点外，还<span class=GramE>搭配着</span>：</span></p>

<p class=MsoNormal align=left style='margin-left:21.0pt;text-align:left;
text-indent:-21.0pt;mso-pagination:widow-orphan;mso-list:l5 level1 lfo12;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='font-family:
Wingdings;mso-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;
color:blue'><span style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>网络构成复杂化</span><span
lang=EN-US style='color:blue'><o:p></o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>这个缺点。</span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>下面，就让我们来看看具体的实例。</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 align=left style='text-align:left;mso-pagination:widow-orphan'><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'>不使用</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:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:red'>的局域网<span class=GramE>中网络</span>构成的改变</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:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>假设有如图所示的由</span><span lang=EN-US>1</span><span