vlan6.htm

V-LAN 虚拟局域网的学习笔记

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<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"'>如果采用这个办法，大家应该不难想象它的<span style='color:red'>扩展性很成问题</span>。每增加一个新的</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"'>，都需要消耗路由器的端口和交换机上的访问链接，而且还需要重新布设一条网线。而<span
style='color:red'>路由器，通常不会带有太多</span></span><span lang=EN-US style='color:red'>LAN</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:red'>接口的</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。新建</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，为了对应增加的</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"'>所需的端口，就必须将路由器升级成带有多个</span><span lang=EN-US>LAN</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>接口的高端产品，这部分成本、还有重新布线所带来的开销，都使得这种接线法成为一种不受欢迎的办法。</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"'>那么，第二种办法“不论</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"'>数目多少，都只用一条网线连接路由器与交换机”呢？当<span style='color:blue'>使用一条网线连接路由器与交换机、进行</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'>间路由时，需要用到汇聚链接</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"'>具体实现过程为：首先将用于连接路由器的交换机端口设为汇聚链接，而路由器上的端口也必须支持汇聚链路。双方用于汇聚链路的协议自然也必须相同。<span
style='color:blue'>接着在路由器上定义对应各个</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“子接口（</span><span
lang=EN-US style='color:blue'>Sub Interface</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>）”</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。尽管实际与交换机连接的物理端口只有一个，但在理论上我们可以把它分割为多个虚拟端口。</span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><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"'>将交换机从逻辑上分割成了多台，因而用于</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"'>间路由的路由器，也必须拥有分别对应各个</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"'>的虚拟接口。</span></p>

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     mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
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<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"'>采用这种方法的话，即使之后在交换机上新建</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"'>，仍只需要一条网线连接交换机和路由器。用户只需要在路由器上新设一个对应新</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"'>的子接口就可以了。与前面的方法相比，扩展性要强得多，也不用担心需要升级</span><span lang=EN-US>LAN</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>接口数不足的路由器或是重新布线。</span><span lang=EN-US><o:p></o:p></span></p>

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