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<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>交换机收到<span class=GramE>广播帧后</span>，只转发到属于同一</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"'>的其他端口。</span></p>
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<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>就这样，</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'>通过限制广播<span
class=GramE>帧</span>转发的范围分割了广播域</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。上图中为了便于说明，以红、蓝两色识别不同的</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"'>，在实际使用中则是用“</span><span lang=EN-US>VLAN
ID</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>”来区分的。</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
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'>直观地描述</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:12.0pt;
color:red'>VLAN<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"'>如果<span style='color:blue'>要更为直观地描述</span></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'>的话，我们可以把它理解为将一台交换机在逻辑上分割成了数台交换机</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。在一台交换机上生成红、蓝两<span
class=GramE>个</span></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"'>，也可以看作是将一台<span
class=GramE>交换机换做一红</span>一蓝两台虚拟的交换机。</span></p>
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